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Applications and Real-Time HTTP Hypertext Transfer Protocol HTTP HTTP semantics HTTP payload HTTP content HTTP method HTTP status code The Hypertext Transfer Protocol (HTTP) is a stateless application-level protocol for distributed, collaborative, hypertext information systems. This document defines the semantics of HTTP: its architecture, terminology, the "http" and "https" Uniform Resource Identifier (URI) schemes, core request methods, request header fields, response status codes, response header fields, and content negotiation. This document obsoletes RFC 2818, RFC 7231, RFC 7232, RFC 7233, RFC 7235, RFC 7538, RFC 7615, RFC 7694, and portions of RFC 7230. Discussion of this draft takes place on the HTTP working group mailing list (ietf-http-wg@w3.org), which is archived at . Working Group information can be found at ; source code and issues list for this draft can be found at . The changes in this draft are summarized in .

The Hypertext Transfer Protocol (HTTP) is a family of stateless, application-level, request/response protocols that share a generic interface, extensible semantics, and self-descriptive messages to enable flexible interaction with network-based hypertext information systems. HTTP hides the details of how a service is implemented by presenting a uniform interface to clients that is independent of the types of resources provided. Likewise, servers do not need to be aware of each client's purpose: a request can be considered in isolation rather than being associated with a specific type of client or a predetermined sequence of application steps. This allows general-purpose implementations to be used effectively in many different contexts, reduces interaction complexity, and enables independent evolution over time. HTTP is also designed for use as an intermediation protocol, wherein proxies and gateways can translate non-HTTP information systems into a more generic interface. One consequence of this flexibility is that the protocol cannot be defined in terms of what occurs behind the interface. Instead, we are limited to defining the syntax of communication, the intent of received communication, and the expected behavior of recipients. If the communication is considered in isolation, then successful actions ought to be reflected in corresponding changes to the observable interface provided by servers. However, since multiple clients might act in parallel and perhaps at cross-purposes, we cannot require that such changes be observable beyond the scope of a single response.

HTTP has been the primary information transfer protocol for the World Wide Web since its introduction in 1990. It began as a trivial mechanism for low-latency requests, with a single method (GET) to request transfer of a presumed hypertext document identified by a given pathname. This original protocol is now referred to as HTTP/0.9. HTTP's version number consists of two decimal digits separated by a "." (period or decimal point). The first digit ("major version") indicates the messaging syntax, whereas the second digit ("minor version") indicates the highest minor version within that major version to which the sender is conformant (able to understand for future communication). As the Web grew, HTTP was extended to enclose requests and responses within messages, transfer arbitrary data formats using MIME-like media types, and route requests through intermediaries, eventually being defined as HTTP/1.0 . HTTP/1.1 was designed to refine the protocol's features while retaining compatibility with the existing text-based messaging syntax, improving its interoperability, scalability, and robustness across the Internet. This included length-based payload delimiters for both fixed and dynamic (chunked) content, a consistent framework for content negotiation, opaque validators for conditional requests, cache controls for better cache consistency, range requests for partial updates, and default persistent connections. HTTP/1.1 was introduced in 1995 and published on the standards track in 1997 , 1999 , and 2014 ( – ). HTTP/2 () introduced a multiplexed session layer on top of the existing TLS and TCP protocols for exchanging concurrent HTTP messages with efficient header field compression and server push. HTTP/3 () provides greater independence for concurrent messages by using QUIC as a secure multiplexed transport over UDP instead of TCP. All three major versions of HTTP rely on the semantics defined by this document. They have not obsoleted each other because each one has specific benefits and limitations depending on the context of use. Implementations are expected to choose the most appropriate transport and messaging syntax for their particular context. This revision of HTTP separates the definition of semantics (this document) and caching () from the current HTTP/1.1 messaging syntax () to allow each major protocol version to progress independently while referring to the same core semantics.

HTTP provides a uniform interface for interacting with a resource (), regardless of its type, nature, or implementation, by sending messages that manipulate or transfer representations (). Each message is either a request or a response. A client constructs request messages that communicate its intentions and routes those messages toward an identified origin server. A server listens for requests, parses each message received, interprets the message semantics in relation to the identified target resource, and responds to that request with one or more response messages. The client examines received responses to see if its intentions were carried out, determining what to do next based on the received status and payloads. HTTP semantics include the intentions defined by each request method (), extensions to those semantics that might be described in request header fields, status codes that describe the response (), and other control data and resource metadata that might be given in response fields. Semantics also include representation metadata that describe how a payload is intended to be interpreted by a recipient, request header fields that might influence content selection, and the various selection algorithms that are collectively referred to as "content negotiation" ().

This document obsoletes the following specifications:

Title	Reference	Changes
HTTP Over TLS
HTTP/1.1 Message Syntax and Routing [*]
HTTP/1.1 Semantics and Content
HTTP/1.1 Conditional Requests
HTTP/1.1 Range Requests
HTTP/1.1 Authentication
HTTP Status Code 308 (Permanent Redirect)
HTTP Authentication-Info and Proxy-Authentication-Info Response Header Fields
HTTP Client-Initiated Content-Encoding

[*] This document only obsoletes the portions of RFC 7230 that are independent of the HTTP/1.1 messaging syntax and connection management; the remaining bits of RFC 7230 are obsoleted by "HTTP/1.1 Messaging" .

This specification uses the Augmented Backus-Naur Form (ABNF) notation of , extended with the notation for case-sensitivity in strings defined in . It also uses a list extension, defined in , that allows for compact definition of comma-separated lists using a '#' operator (similar to how the '*' operator indicates repetition). shows the collected grammar with all list operators expanded to standard ABNF notation. As a convention, ABNF rule names prefixed with "obs-" denote "obsolete" grammar rules that appear for historical reasons. The following core rules are included by reference, as defined in : ALPHA (letters), CR (carriage return), CRLF (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote), HEXDIG (hexadecimal 0-9/A-F/a-f), HTAB (horizontal tab), LF (line feed), OCTET (any 8-bit sequence of data), SP (space), and VCHAR (any visible US-ASCII character). defines some generic syntactic components for field values. The rule below is defined in ; transfer-coding = <transfer-coding, see > This specification uses the terms "character", "character encoding scheme", "charset", and "protocol element" as they are defined in .

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 when, and only when, they appear in all capitals, as shown here. This specification targets conformance criteria according to the role of a participant in HTTP communication. Hence, requirements are placed on senders, recipients, clients, servers, user agents, intermediaries, origin servers, proxies, gateways, or caches, depending on what behavior is being constrained by the requirement. Additional (social) requirements are placed on implementations, resource owners, and protocol element registrations when they apply beyond the scope of a single communication. The verb "generate" is used instead of "send" where a requirement applies only to implementations that create the protocol element, rather than an implementation that forwards a received element downstream. An implementation is considered conformant if it complies with all of the requirements associated with the roles it partakes in HTTP. Conformance includes both the syntax and semantics of protocol elements. A sender MUST NOT generate protocol elements that convey a meaning that is known by that sender to be false. A sender MUST NOT generate protocol elements that do not match the grammar defined by the corresponding ABNF rules. Within a given message, a sender MUST NOT generate protocol elements or syntax alternatives that are only allowed to be generated by participants in other roles (i.e., a role that the sender does not have for that message).

When a received protocol element is parsed, the recipient MUST be able to parse any value of reasonable length that is applicable to the recipient's role and that matches the grammar defined by the corresponding ABNF rules. Note, however, that some received protocol elements might not be parsed. For example, an intermediary forwarding a message might parse a field into generic field name and field value components, but then forward the field without further parsing inside the field value. HTTP does not have specific length limitations for many of its protocol elements because the lengths that might be appropriate will vary widely, depending on the deployment context and purpose of the implementation. Hence, interoperability between senders and recipients depends on shared expectations regarding what is a reasonable length for each protocol element. Furthermore, what is commonly understood to be a reasonable length for some protocol elements has changed over the course of the past two decades of HTTP use and is expected to continue changing in the future. At a minimum, a recipient MUST be able to parse and process protocol element lengths that are at least as long as the values that it generates for those same protocol elements in other messages. For example, an origin server that publishes very long URI references to its own resources needs to be able to parse and process those same references when received as a target URI.

A recipient MUST interpret a received protocol element according to the semantics defined for it by this specification, including extensions to this specification, unless the recipient has determined (through experience or configuration) that the sender incorrectly implements what is implied by those semantics. For example, an origin server might disregard the contents of a received Accept-Encoding header field if inspection of the User-Agent header field indicates a specific implementation version that is known to fail on receipt of certain content codings. Unless noted otherwise, a recipient MAY attempt to recover a usable protocol element from an invalid construct. HTTP does not define specific error handling mechanisms except when they have a direct impact on security, since different applications of the protocol require different error handling strategies. For example, a Web browser might wish to transparently recover from a response where the Location header field doesn't parse according to the ABNF, whereas a systems control client might consider any form of error recovery to be dangerous. Some requests can be automatically retried by a client in the event of an underlying connection failure, as described in .

HTTP was created for the World Wide Web (WWW) architecture and has evolved over time to support the scalability needs of a worldwide hypertext system. Much of that architecture is reflected in the terminology and syntax productions used to define HTTP.

The target of an HTTP request is called a "resource". HTTP does not limit the nature of a resource; it merely defines an interface that might be used to interact with resources. Most resources are identified by a Uniform Resource Identifier (URI), as described in . One design goal of HTTP is to separate resource identification from request semantics, which is made possible by vesting the request semantics in the request method () and a few request-modifying header fields. If there is a conflict between the method semantics and any semantic implied by the URI itself, as described in , the method semantics take precedence. HTTP relies upon the Uniform Resource Identifier (URI) standard to indicate the target resource () and relationships between resources.

HTTP is a client/server protocol that operates over a reliable transport- or session-layer "connection". An HTTP "client" is a program that establishes a connection to a server for the purpose of sending one or more HTTP requests. An HTTP "server" is a program that accepts connections in order to service HTTP requests by sending HTTP responses. The terms "client" and "server" refer only to the roles that these programs perform for a particular connection. The same program might act as a client on some connections and a server on others.

HTTP is a stateless request/response protocol for exchanging "messages" across a connection. The terms "sender" and "recipient" refer to any implementation that sends or receives a given message, respectively. A client sends requests to a server in the form of a request message with a method () and request target (). The request might also contain header fields () for request modifiers, client information, and representation metadata, a payload body () to be processed in accordance with the method, and trailer fields () for metadata collected while sending the payload. A server responds to a client's request by sending one or more response messages, each including a status code (). The response might also contain header fields for server information, resource metadata, and representation metadata, a payload body to be interpreted in accordance with the status code, and trailer fields for metadata collected while sending the payload.

The term "user agent" refers to any of the various client programs that initiate a request. The most familiar form of user agent is the general-purpose Web browser, but that's only a small percentage of implementations. Other common user agents include spiders (web-traversing robots), command-line tools, billboard screens, household appliances, scales, light bulbs, firmware update scripts, mobile apps, and communication devices in a multitude of shapes and sizes. Being a user agent does not imply that there is a human user directly interacting with the software agent at the time of a request. In many cases, a user agent is installed or configured to run in the background and save its results for later inspection (or save only a subset of those results that might be interesting or erroneous). Spiders, for example, are typically given a start URI and configured to follow certain behavior while crawling the Web as a hypertext graph. Many user agents cannot, or choose not to, make interactive suggestions to their user or provide adequate warning for security or privacy concerns. In the few cases where this specification requires reporting of errors to the user, it is acceptable for such reporting to only be observable in an error console or log file. Likewise, requirements that an automated action be confirmed by the user before proceeding might be met via advance configuration choices, run-time options, or simple avoidance of the unsafe action; confirmation does not imply any specific user interface or interruption of normal processing if the user has already made that choice.

The term "origin server" refers to a program that can originate authoritative responses for a given target resource. The most familiar form of origin server are large public websites. However, like user agents being equated with browsers, it is easy to be misled into thinking that all origin servers are alike. Common origin servers also include home automation units, configurable networking components, office machines, autonomous robots, news feeds, traffic cameras, real-time ad selectors, and video-on-demand platforms.

Most HTTP communication consists of a retrieval request (GET) for a representation of some resource identified by a URI. In the simplest case, this might be accomplished via a single bidirectional connection (===) between the user agent (UA) and the origin server (O).

request > UA ======================================= O < response

The following example illustrates a typical message exchange for a GET request () on the URI "http://www.example.com/hello.txt": Client request: GET /hello.txt HTTP/1.1 User-Agent: curl/7.16.3 libcurl/7.16.3 OpenSSL/0.9.7l zlib/1.2.3 Host: www.example.com Accept-Language: en, mi Server response: HTTP/1.1 200 OK Date: Mon, 27 Jul 2009 12:28:53 GMT Server: Apache Last-Modified: Wed, 22 Jul 2009 19:15:56 GMT ETag: "34aa387-d-1568eb00" Accept-Ranges: bytes Content-Length: Vary: Accept-Encoding Content-Type: text/plain Hello World! My payload includes a trailing CRLF.

HTTP enables the use of intermediaries to satisfy requests through a chain of connections. There are three common forms of HTTP intermediary: proxy, gateway, and tunnel. In some cases, a single intermediary might act as an origin server, proxy, gateway, or tunnel, switching behavior based on the nature of each request.

> > > > UA =========== A =========== B =========== C =========== O < < < <

The figure above shows three intermediaries (A, B, and C) between the user agent and origin server. A request or response message that travels the whole chain will pass through four separate connections. Some HTTP communication options might apply only to the connection with the nearest, non-tunnel neighbor, only to the endpoints of the chain, or to all connections along the chain. Although the diagram is linear, each participant might be engaged in multiple, simultaneous communications. For example, B might be receiving requests from many clients other than A, and/or forwarding requests to servers other than C, at the same time that it is handling A's request. Likewise, later requests might be sent through a different path of connections, often based on dynamic configuration for load balancing. The terms "upstream" and "downstream" are used to describe directional requirements in relation to the message flow: all messages flow from upstream to downstream. The terms "inbound" and "outbound" are used to describe directional requirements in relation to the request route: "inbound" means toward the origin server and "outbound" means toward the user agent. A "proxy" is a message-forwarding agent that is chosen by the client, usually via local configuration rules, to receive requests for some type(s) of absolute URI and attempt to satisfy those requests via translation through the HTTP interface. Some translations are minimal, such as for proxy requests for "http" URIs, whereas other requests might require translation to and from entirely different application-level protocols. Proxies are often used to group an organization's HTTP requests through a common intermediary for the sake of security, annotation services, or shared caching. Some proxies are designed to apply transformations to selected messages or payloads while they are being forwarded, as described in . A "gateway" (a.k.a. "reverse proxy") is an intermediary that acts as an origin server for the outbound connection but translates received requests and forwards them inbound to another server or servers. Gateways are often used to encapsulate legacy or untrusted information services, to improve server performance through "accelerator" caching, and to enable partitioning or load balancing of HTTP services across multiple machines. All HTTP requirements applicable to an origin server also apply to the outbound communication of a gateway. A gateway communicates with inbound servers using any protocol that it desires, including private extensions to HTTP that are outside the scope of this specification. However, an HTTP-to-HTTP gateway that wishes to interoperate with third-party HTTP servers ought to conform to user agent requirements on the gateway's inbound connection. A "tunnel" acts as a blind relay between two connections without changing the messages. Once active, a tunnel is not considered a party to the HTTP communication, though the tunnel might have been initiated by an HTTP request. A tunnel ceases to exist when both ends of the relayed connection are closed. Tunnels are used to extend a virtual connection through an intermediary, such as when Transport Layer Security (TLS, ) is used to establish confidential communication through a shared firewall proxy. The above categories for intermediary only consider those acting as participants in the HTTP communication. There are also intermediaries that can act on lower layers of the network protocol stack, filtering or redirecting HTTP traffic without the knowledge or permission of message senders. Network intermediaries are indistinguishable (at a protocol level) from an on-path attacker, often introducing security flaws or interoperability problems due to mistakenly violating HTTP semantics. For example, an "interception proxy" (also commonly known as a "transparent proxy" or "captive portal") differs from an HTTP proxy because it is not chosen by the client. Instead, an interception proxy filters or redirects outgoing TCP port 80 packets (and occasionally other common port traffic). Interception proxies are commonly found on public network access points, as a means of enforcing account subscription prior to allowing use of non-local Internet services, and within corporate firewalls to enforce network usage policies. HTTP is defined as a stateless protocol, meaning that each request message can be understood in isolation. Many implementations depend on HTTP's stateless design in order to reuse proxied connections or dynamically load balance requests across multiple servers. Hence, a server MUST NOT assume that two requests on the same connection are from the same user agent unless the connection is secured and specific to that agent. Some non-standard HTTP extensions (e.g., ) have been known to violate this requirement, resulting in security and interoperability problems.

A "cache" is a local store of previous response messages and the subsystem that controls its message storage, retrieval, and deletion. A cache stores cacheable responses in order to reduce the response time and network bandwidth consumption on future, equivalent requests. Any client or server MAY employ a cache, though a cache cannot be used by a server while it is acting as a tunnel. The effect of a cache is that the request/response chain is shortened if one of the participants along the chain has a cached response applicable to that request. The following illustrates the resulting chain if B has a cached copy of an earlier response from O (via C) for a request that has not been cached by UA or A.

> > UA =========== A =========== B - - - - - - C - - - - - - O < <

A response is "cacheable" if a cache is allowed to store a copy of the response message for use in answering subsequent requests. Even when a response is cacheable, there might be additional constraints placed by the client or by the origin server on when that cached response can be used for a particular request. HTTP requirements for cache behavior and cacheable responses are defined in . There is a wide variety of architectures and configurations of caches deployed across the World Wide Web and inside large organizations. These include national hierarchies of proxy caches to save transoceanic bandwidth, collaborative systems that broadcast or multicast cache entries, archives of pre-fetched cache entries for use in off-line or high-latency environments, and so on.

Uniform Resource Identifiers (URIs) are used throughout HTTP as the means for identifying resources ().

URI references are used to target requests, indicate redirects, and define relationships. The definitions of "URI-reference", "absolute-URI", "relative-part", "authority", "port", "host", "path-abempty", "segment", and "query" are adopted from the URI generic syntax. An "absolute-path" rule is defined for protocol elements that can contain a non-empty path component. (This rule differs slightly from the path-abempty rule of RFC 3986, which allows for an empty path to be used in references, and path-absolute rule, which does not allow paths that begin with "//".) A "partial-URI" rule is defined for protocol elements that can contain a relative URI but not a fragment component. URI-reference = <URI-reference, see > absolute-URI = <absolute-URI, see > relative-part = <relative-part, see > authority = <authority, see > uri-host = <host, see > port = <port, see > path-abempty = <path-abempty, see > segment = <segment, see > query = <query, see > absolute-path = 1*( "/" segment ) partial-URI = relative-part [ "?" query ] Each protocol element in HTTP that allows a URI reference will indicate in its ABNF production whether the element allows any form of reference (URI-reference), only a URI in absolute form (absolute-URI), only the path and optional query components, or some combination of the above. Unless otherwise indicated, URI references are parsed relative to the target URI (). It is RECOMMENDED that all senders and recipients support, at a minimum, URIs with lengths of 8000 octets in protocol elements. Note that this implies some structures and on-wire representations (for example, the request line in HTTP/1.1) will necessarily be larger in some cases.

IANA maintains the registry of URI Schemes at . Although requests might target any URI scheme, the following schemes are inherent to HTTP servers:

URI Scheme	Description	Ref.
http	Hypertext Transfer Protocol
https	Hypertext Transfer Protocol Secure

Note that the presence of an "http" or "https" URI does not imply that there is always an HTTP server at the identified origin listening for connections. Anyone can mint a URI, whether or not a server exists and whether or not that server currently maps that identifier to a resource. The delegated nature of registered names and IP addresses creates a federated namespace whether or not an HTTP server is present.

The "http" URI scheme is hereby defined for minting identifiers within the hierarchical namespace governed by a potential HTTP origin server listening for TCP () connections on a given port. http-URI = "http" "://" authority path-abempty [ "?" query ] The origin server for an "http" URI is identified by the authority component, which includes a host identifier and optional port number (). If the port subcomponent is empty or not given, TCP port 80 (the reserved port for WWW services) is the default. The origin determines who has the right to respond authoritatively to requests that target the identified resource, as defined in . A sender MUST NOT generate an "http" URI with an empty host identifier. A recipient that processes such a URI reference MUST reject it as invalid. The hierarchical path component and optional query component identify the target resource within that origin server's name space.

The "https" URI scheme is hereby defined for minting identifiers within the hierarchical namespace governed by a potential origin server listening for TCP connections on a given port and capable of establishing a TLS () connection that has been secured for HTTP communication. In this context, "secured" specifically means that the server has been authenticated as acting on behalf of the identified authority and all HTTP communication with that server has been protected for confidentiality and integrity through the use of strong encryption. https-URI = "https" "://" authority path-abempty [ "?" query ] The origin server for an "https" URI is identified by the authority component, which includes a host identifier and optional port number (). If the port subcomponent is empty or not given, TCP port 443 (the reserved port for HTTP over TLS) is the default. The origin determines who has the right to respond authoritatively to requests that target the identified resource, as defined in . A sender MUST NOT generate an "https" URI with an empty host identifier. A recipient that processes such a URI reference MUST reject it as invalid. The hierarchical path component and optional query component identify the target resource within that origin server's name space. A client MUST ensure that its HTTP requests for an "https" resource are secured, prior to being communicated, and that it only accepts secured responses to those requests. Resources made available via the "https" scheme have no shared identity with the "http" scheme. They are distinct origins with separate namespaces. However, an extension to HTTP that is defined to apply to all origins with the same host, such as the Cookie protocol , can allow information set by one service to impact communication with other services within a matching group of host domains.

Since the "http" and "https" schemes conform to the URI generic syntax, such URIs are normalized and compared according to the algorithm defined in , using the defaults described above for each scheme. If the port is equal to the default port for a scheme, the normal form is to omit the port subcomponent. When not being used as the target of an OPTIONS request, an empty path component is equivalent to an absolute path of "/", so the normal form is to provide a path of "/" instead. The scheme and host are case-insensitive and normally provided in lowercase; all other components are compared in a case-sensitive manner. Characters other than those in the "reserved" set are equivalent to their percent-encoded octets: the normal form is to not encode them (see Sections and of ). For example, the following three URIs are equivalent: http://example.com:80/~smith/home.html http://EXAMPLE.com/%7Esmith/home.html http://EXAMPLE.com:/%7esmith/home.html

The URI generic syntax for authority also includes a userinfo subcomponent () for including user authentication information in the URI. In that subcomponent, the use of the format "user:password" is deprecated. Some implementations make use of the userinfo component for internal configuration of authentication information, such as within command invocation options, configuration files, or bookmark lists, even though such usage might expose a user identifier or password. A sender MUST NOT generate the userinfo subcomponent (and its "@" delimiter) when an "http" or "https" URI reference is generated within a message as a target URI or field value. Before making use of an "http" or "https" URI reference received from an untrusted source, a recipient SHOULD parse for userinfo and treat its presence as an error; it is likely being used to obscure the authority for the sake of phishing attacks.

Fragment identifiers allow for indirect identification of a secondary resource, independent of the URI scheme, as defined in . Some protocol elements that refer to a URI allow inclusion of a fragment, while others do not. They are distinguished by use of the ABNF rule for elements where fragment is allowed; otherwise, a specific rule that excludes fragments is used (see ).

See for security considerations related to establishing authority.

The "origin" for a given URI is the triple of scheme, host, and port after normalizing the scheme and host to lowercase and normalizing the port to remove any leading zeros. If port is elided from the URI, the default port for that scheme is used. For example, the URI https://Example.Com/happy.js would have the origin { "https", "example.com", "443" } which can also be described as the normalized URI prefix with port always present: https://example.com:443 Each origin defines its own namespace and controls how identifiers within that namespace are mapped to resources. In turn, how the origin responds to valid requests, consistently over time, determines the semantics that users will associate with a URI, and the usefulness of those semantics is what ultimately transforms these mechanisms into a "resource" for users to reference and access in the future. Two origins are distinct if they differ in scheme, host, or port. Even when it can be verified that the same entity controls two distinct origins, the two namespaces under those origins are distinct unless explicitly aliased by a server authoritative for that origin. Origin is also used within HTML and related Web protocols, beyond the scope of this document, as described in .

Although HTTP is independent of the transport protocol, the "http" scheme () is specific to associating authority with whomever controls the origin server listening for TCP connections on the indicated port of whatever host is identified within the authority component. This is a very weak sense of authority because it depends on both client-specific name resolution mechanisms and communication that might not be secured from an on-path attacker. Nevertheless, it is a sufficient minimum for binding "http" identifiers to an origin server for consistent resolution within a trusted environment. If the host identifier is provided as an IP address, the origin server is the listener (if any) on the indicated TCP port at that IP address. If host is a registered name, the registered name is an indirect identifier for use with a name resolution service, such as DNS, to find an address for an appropriate origin server. When an "http" URI is used within a context that calls for access to the indicated resource, a client MAY attempt access by resolving the host identifier to an IP address, establishing a TCP connection to that address on the indicated port, and sending an HTTP request message to the server containing the URI's identifying data. If the server responds to such a request with a non-interim HTTP response message, as described in , then that response is considered an authoritative answer to the client's request. Note, however, that the above is not the only means for obtaining an authoritative response, nor does it imply that an authoritative response is always necessary (see ). For example, the Alt-Svc header field allows an origin server to identify other services that are also authoritative for that origin. Access to "http" identified resources might also be provided by protocols outside the scope of this document.

The "https" scheme () associates authority based on the ability of a server to use the private key corresponding to a certificate that the client considers to be trustworthy for the identified origin server. The client usually relies upon a chain of trust, conveyed from some prearranged or configured trust anchor, to deem a certificate trustworthy (). In HTTP/1.1 and earlier, a client will only attribute authority to a server when they are communicating over a successfully established and secured connection specifically to that URI origin's host. The connection establishment and certificate verification are used as proof of authority. In HTTP/2 and HTTP/3, a client will attribute authority to a server when they are communicating over a successfully established and secured connection if the URI origin's host matches any of the hosts present in the server's certificate and the client believes that it could open a connection to that host for that URI. In practice, a client will make a DNS query to check that the origin's host contains the same server IP address as the established connection. This restriction can be removed by the origin server sending an equivalent ORIGIN frame . The request target's host and port value are passed within each HTTP request, identifying the origin and distinguishing it from other namespaces that might be controlled by the same server. It is the origin's responsibility to ensure that any services provided with control over its certificate's private key are equally responsible for managing the corresponding "https" namespaces, or at least prepared to reject requests that appear to have been misdirected. A server might be unwilling to serve as the origin for some hosts even when they have the authority to do so. For example, if a network attacker causes connections for port N to be received at port Q, checking the target URI is necessary to ensure that the attacker can't cause "https://example.com:N/foo" to be replaced by "https://example.com:Q/foo" without consent. Note that the "https" scheme does not rely on TCP and the connected port number for associating authority, since both are outside the secured communication and thus cannot be trusted as definitive. Hence, the HTTP communication might take place over any channel that has been secured, as defined in , including protocols that don't use TCP. When an "https" URI is used within a context that calls for access to the indicated resource, a client MAY attempt access by resolving the host identifier to an IP address, establishing a TCP connection to that address on the indicated port, securing the connection end-to-end by successfully initiating TLS over TCP with confidentiality and integrity protection, and sending an HTTP request message over that connection containing the URI's identifying data. If the server responds to such a request with a non-interim HTTP response message, as described in , then that response is considered an authoritative answer to the client's request. Note, however, that the above is not the only means for obtaining an authoritative response, nor does it imply that an authoritative response is always necessary (see ).

To establish a secured connection to dereference a URI, a client MUST verify that the service's identity is an acceptable match for the URI's origin server. Certificate verification is used to prevent server impersonation by an on-path attacker or by an attacker that controls name resolution. This process requires that a client be configured with a set of trust anchors. In general, a client MUST verify the service identity using the verification process defined in (for a reference identifier of type URI-ID) unless the client has been specifically configured to accept some other form of verification. For example, a client might be connecting to a server whose address and hostname are dynamic, with an expectation that the service will present a specific certificate (or a certificate matching some externally defined reference identity) rather than one matching the dynamic URI's origin server identifier. In special cases, it might be appropriate for a client to simply ignore the server's identity, but it must be understood that this leaves a connection open to active attack. If the certificate is not valid for the URI's origin server, a user agent MUST either notify the user (user agents MAY give the user an option to continue with the connection in any case) or terminate the connection with a bad certificate error. Automated clients MUST log the error to an appropriate audit log (if available) and SHOULD terminate the connection (with a bad certificate error). Automated clients MAY provide a configuration setting that disables this check, but MUST provide a setting which enables it.

Each major version of HTTP defines its own syntax for the communication of messages. However, they share a common data abstraction. A message consists of control data to describe and route the message, optional header fields that modify or extend the message semantics, describe the sender, the payload, or provide additional context, a potentially unbounded stream of payload data, and optional trailer fields for metadata collected while sending the payload. Messages are intended to be self-descriptive. This means that everything a recipient needs to know about the message can be determined by looking at the message itself, after decoding or reconstituting parts that have been compressed or elided in transit, without requiring an understanding of the sender's current application state (established via prior messages).

While HTTP's core semantics don't change between protocol versions, the expression of them "on the wire" can change, and so the HTTP version number changes when incompatible changes are made to the wire format. Additionally, HTTP allows incremental, backwards-compatible changes to be made to the protocol without changing its version through the use of defined extension points (). The protocol version as a whole indicates the sender's conformance with the set of requirements laid out in that version's corresponding specification of HTTP. For example, the version "HTTP/1.1" is defined by the combined specifications of this document, "HTTP Caching" , and "HTTP/1.1 Messaging" . HTTP's major version number is incremented when an incompatible message syntax is introduced. The minor number is incremented when changes made to the protocol have the effect of adding to the message semantics or implying additional capabilities of the sender. The minor version advertises the sender's communication capabilities even when the sender is only using a backwards-compatible subset of the protocol, thereby letting the recipient know that more advanced features can be used in response (by servers) or in future requests (by clients). A client SHOULD send a request version equal to the highest version to which the client is conformant and whose major version is no higher than the highest version supported by the server, if this is known. A client MUST NOT send a version to which it is not conformant. A client MAY send a lower request version if it is known that the server incorrectly implements the HTTP specification, but only after the client has attempted at least one normal request and determined from the response status code or header fields (e.g., Server) that the server improperly handles higher request versions. A server SHOULD send a response version equal to the highest version to which the server is conformant that has a major version less than or equal to the one received in the request. A server MUST NOT send a version to which it is not conformant. A server can send a 505 (HTTP Version Not Supported) response if it wishes, for any reason, to refuse service of the client's major protocol version. When an HTTP message is received with a major version number that the recipient implements, but a higher minor version number than what the recipient implements, the recipient SHOULD process the message as if it were in the highest minor version within that major version to which the recipient is conformant. A recipient can assume that a message with a higher minor version, when sent to a recipient that has not yet indicated support for that higher version, is sufficiently backwards-compatible to be safely processed by any implementation of the same major version. When a major version of HTTP does not define any minor versions, the minor version "0" is implied and is used when referring to that protocol within a protocol element that requires sending a minor version.

Message framing defines how each message begins and ends, such that the message can be distinguished from other message (or noise) on the same connection. Framing is specific to each major version of HTTP. One of the functions of message framing is to assure that messages are complete. A message is considered complete when all of the octets indicated by its framing are available. Note that, when no explicit framing is used, a response message that is ended by the transport connection's close is considered complete even though it might be indistinguishable from an incomplete response, unless a transport-level error indicates that it is not complete.

HTTP communication is initiated by a user agent for some purpose. The purpose is a combination of request semantics and a target resource upon which to apply those semantics.

HTTP messages use key/value pairs to convey data about the message, its payload, the target resource, or the connection. They are called "HTTP fields" or just "fields". Fields that are sent/received before the message body are referred to as "header fields" (or just "headers", colloquially) and are located within the "header section" of a message. We refer to some named fields specifically as a "header field" when they are only allowed to be sent in the header section. Fields that are sent/received after the header section has ended (usually after the message body begins to stream) are referred to as "trailer fields" (or just "trailers", colloquially) and located within a "trailer section". One or more trailer sections are only possible when supported by the version of HTTP in use and enabled by an extensible mechanism for framing message sections. Both sections are composed of any number of "field lines", each with a "field name" (see ) identifying the field, and a "field line value" that conveys data for the field. Each field name present in a section has a corresponding "field value" for that section, composed from all field line values with that given field name in that section, concatenated together and separated with commas. See for further discussion of the semantics of field ordering and combination in messages, and for more discussion of field values. For example, this section: Example-Field: Foo, Bar Example-Field: Baz contains two field lines, both with the field name "Example-Field". The first field line has a field line value of "Foo, Bar", while the second field line value is "Baz". The field value for "Example-Field" is a list with three members: "Foo", "Bar", and "Baz". The interpretation of a field does not change between minor versions of the same major HTTP version, though the default behavior of a recipient in the absence of such a field can change. Unless specified otherwise, fields are defined for all versions of HTTP. In particular, the Host and Connection fields ought to be implemented by all HTTP/1.x implementations whether or not they advertise conformance with HTTP/1.1. New fields can be introduced without changing the protocol version if their defined semantics allow them to be safely ignored by recipients that do not recognize them; see . A proxy MUST forward unrecognized header fields unless the field name is listed in the Connection header field () or the proxy is specifically configured to block, or otherwise transform, such fields. Other recipients SHOULD ignore unrecognized header and trailer fields. These requirements allow HTTP's functionality to be enhanced without requiring prior update of deployed intermediaries.

The order in which field lines with differing names are received in a message is not significant. However, it is good practice to send header fields that contain control data first, such as Host on requests and Date on responses, so that implementations can decide when not to handle a message as early as possible. A server MUST NOT apply a request to the target resource until the entire request header section is received, since later header field lines might include conditionals, authentication credentials, or deliberately misleading duplicate header fields that would impact request processing. A recipient MAY combine multiple field lines with the same field name into one field line, without changing the semantics of the message, by appending each subsequent field line value to the initial field line value in order, separated by a comma and OWS (optional whitespace). For consistency, use comma SP. The order in which field lines with the same name are received is therefore significant to the interpretation of the field value; a proxy MUST NOT change the order of these field line values when forwarding a message. This means that, aside from the well-known exception noted below, a sender MUST NOT generate multiple field lines with the same name in a message (whether in the headers or trailers), or append a field line when a field line of the same name already exists in the message, unless that field's definition allows multiple field line values to be recombined as a comma-separated list [i.e., at least one alternative of the field's definition allows a comma-separated list, such as an ABNF rule of #(values) defined in ].

HTTP does not place a predefined limit on the length of each field line, field value, or on the length of a header or trailer section as a whole, as described in . Various ad hoc limitations on individual lengths are found in practice, often depending on the specific field's semantics. A server that receives a request header field line, field value, or set of fields larger than it wishes to process MUST respond with an appropriate 4xx (Client Error) status code. Ignoring such header fields would increase the server's vulnerability to request smuggling attacks (). A client MAY discard or truncate received field lines that are larger than the client wishes to process if the field semantics are such that the dropped value(s) can be safely ignored without changing the message framing or response semantics.

The field-name token labels the corresponding field value as having the semantics defined by that field. For example, the Date header field is defined in as containing the origination timestamp for the message in which it appears. field-name = token Field names are case-insensitive and ought to be registered within the "Hypertext Transfer Protocol (HTTP) Field Name Registry"; see .

HTTP field values typically have their syntax defined using ABNF (), using the extension defined in as necessary, and are usually constrained to the range of US-ASCII characters. Fields needing a greater range of characters can use an encoding such as the one defined in . field-value = *field-content field-content = field-vchar [ 1*( SP / HTAB / field-vchar ) field-vchar ] field-vchar = VCHAR / obs-text Historically, HTTP allowed field content with text in the ISO‑8859‑1 charset , supporting other charsets only through use of encoding. In practice, most HTTP field values use only a subset of the US-ASCII charset . Newly defined fields SHOULD limit their values to US‑ASCII octets. A recipient SHOULD treat other octets in field content (obs‑text) as opaque data. Field values containing control (CTL) characters such as CR or LF are invalid; recipients MUST either reject a field value containing control characters, or convert them to SP before processing or forwarding the message. Leading and trailing whitespace in raw field values is removed upon field parsing (e.g., ). Field definitions where leading or trailing whitespace in values is significant will have to use a container syntax such as quoted-string (). Commas (",") often are used to separate members in field values. Fields that allow multiple members are referred to as list-based fields. Fields that only anticipate a single member are referred to as singleton fields. Because commas are used as a generic delimiter between members, they need to be treated with care if they are allowed as data within a member. This is true for both list-based and singleton fields, since a singleton field might be sent with multiple members erroneously; being able to detect this condition improves interoperability. Fields that expect to contain a comma within a member, such as an HTTP-date or URI-reference element, ought to be defined with delimiters around that element to distinguish any comma within that data from potential list separators. For example, a textual date and a URI (either of which might contain a comma) could be safely carried in list-based field values like these: Example-URI-Field: "http://example.com/a.html,foo", "http://without-a-comma.example.com/" Example-Date-Field: "Sat, 04 May 1996", "Wed, 14 Sep 2005" Note that double-quote delimiters almost always are used with the quoted-string production; using a different syntax inside double-quotes will likely cause unnecessary confusion. Many fields (such as Content-Type, defined in ) use a common syntax for parameters that allows both unquoted (token) and quoted (quoted-string) syntax for a parameter value (). Use of common syntax allows recipients to reuse existing parser components. When allowing both forms, the meaning of a parameter value ought to be the same whether it was received as a token or a quoted string. Historically, HTTP field values could be extended over multiple lines by preceding each extra line with at least one space or horizontal tab (obs-fold). This document assumes that any such obsolete line folding has been replaced with one or more SP octets prior to interpreting the field value, as described in .

Some HTTP messages transfer a complete or partial representation as the message "payload". In some cases, a payload might contain only the associated representation's header fields (e.g., responses to HEAD) or only some part(s) of the representation data (e.g., the 206 (Partial Content) status code).

The purpose of a payload in a request is defined by the method semantics. For example, a representation in the payload of a PUT request () represents the desired state of the target resource if the request is successfully applied, whereas a representation in the payload of a POST request () represents information to be processed by the target resource. In a response, the payload's purpose is defined by both the request method and the response status code. For example, the payload of a 200 (OK) response to GET () represents the current state of the target resource, as observed at the time of the message origination date (), whereas the payload of the same status code in a response to POST might represent either the processing result or the new state of the target resource after applying the processing. Response messages with an error status code usually contain a payload that represents the error condition, such that it describes the error state and what next steps are suggested for resolving it.

When a complete or partial representation is transferred in a message payload, it is often desirable for the sender to supply, or the recipient to determine, an identifier for a resource corresponding to that representation. For a request message:

• If the request has a Content-Location header field, then the sender asserts that the payload is a representation of the resource identified by the Content-Location field value. However, such an assertion cannot be trusted unless it can be verified by other means (not defined by this specification). The information might still be useful for revision history links.
• Otherwise, the payload is unidentified.

For a response message, the following rules are applied in order until a match is found:

1. If the request method is GET or HEAD and the response status code is 200 (OK), 204 (No Content), 206 (Partial Content), or 304 (Not Modified), the payload is a representation of the resource identified by the target URI ().
2. If the request method is GET or HEAD and the response status code is 203 (Non-Authoritative Information), the payload is a potentially modified or enhanced representation of the target resource as provided by an intermediary.
3. If the response has a Content-Location header field and its field value is a reference to the same URI as the target URI, the payload is a representation of the target resource.
4. If the response has a Content-Location header field and its field value is a reference to a URI different from the target URI, then the sender asserts that the payload is a representation of the resource identified by the Content-Location field value. However, such an assertion cannot be trusted unless it can be verified by other means (not defined by this specification).
5. Otherwise, the payload is unidentified.

Header fields that specifically describe the payload, rather than the associated representation, are referred to as "payload header fields". Payload header fields are defined in other parts of this specification, due to their impact on message parsing.

The payload body contains the data of a request or response. This is distinct from the message body (e.g., ), which is how the payload body is transferred "on the wire", and might be encoded, depending on the HTTP version in use. It is also distinct from a request or response's representation data (), which can be inferred from protocol operation, rather than necessarily appearing "on the wire." The presence of a payload body in a request depends on whether the request method used defines semantics for it. The presence of a payload body in a response depends on both the request method to which it is responding and the response status code (). Responses to the HEAD request method () never include a payload body because the associated response header fields indicate only what their values would have been if the request method had been GET (). 2xx (Successful) responses to a CONNECT request method () switch the connection to tunnel mode instead of having a payload body. All 1xx (Informational), 204 (No Content), and 304 (Not Modified) responses do not include a payload body. All other responses do include a payload body, although that body might be of zero length.

In some HTTP versions, additional metadata can be sent after the initial header section has been completed (during or after transmission of the payload body), such as a message integrity check, digital signature, or post-processing status. For example, the chunked coding in HTTP/1.1 allows a trailer section after the payload body () which can contain trailer fields: field names and values that share the same syntax and namespace as header fields but that are received after the header section. Trailer fields ought to be processed and stored separately from the fields in the header section to avoid contradicting message semantics known at the time the header section was complete. The presence or absence of certain header fields might impact choices made for the routing or processing of the message as a whole before the trailers are received; those choices cannot be unmade by the later discovery of trailer fields.

Many fields cannot be processed outside the header section because their evaluation is necessary prior to receiving the message body, such as those that describe message framing, routing, authentication, request modifiers, response controls, or payload format. A sender MUST NOT generate a trailer field unless the sender knows the corresponding header field name's definition permits the field to be sent in trailers. Trailer fields can be difficult to process by intermediaries that forward messages from one protocol version to another. If the entire message can be buffered in transit, some intermediaries could merge trailer fields into the header section (as appropriate) before it is forwarded. However, in most cases, the trailers are simply discarded. A recipient MUST NOT merge a trailer field into a header section unless the recipient understands the corresponding header field definition and that definition explicitly permits and defines how trailer field values can be safely merged. The presence of the keyword "trailers" in the TE header field () indicates that the client is willing to accept trailer fields, on behalf of itself and any downstream clients. For requests from an intermediary, this implies that all downstream clients are willing to accept trailer fields in the forwarded response. Note that the presence of "trailers" does not mean that the client(s) will process any particular trailer field in the response; only that the trailer section(s) will not be dropped by any of the clients. Because of the potential for trailer fields to be discarded in transit, a server SHOULD NOT generate trailer fields that it believes are necessary for the user agent to receive.

Like header fields, trailer fields with the same name are processed in the order received; multiple trailer field lines with the same name have the equivalent semantics as appending the multiple values as a list of members, even when the field lines are received in separate trailer sections. Trailer fields that might be generated more than once during a message MUST be defined as a list value even if each member value is only processed once per field line received. Trailer fields are expected (but not required) to be processed one trailer section at a time. That is, for each trailer section received, a recipient that is looking for trailer fields will parse the received section into fields, invoke any associated processing for those fields at that point in the message processing, and then append those fields to the set of trailer fields received for the overall message. This behavior allows for iterative processing of trailer fields that contain incremental signatures or mid-stream status information, and fields that might refer to each other's values within the same section. However, there is no guarantee that trailer sections won't shift in relation to the message body stream, or won't be recombined (or dropped) in transit, so trailer fields that refer to data outside the present trailer section need to use self-descriptive references (i.e., refer to the data by name, ordinal position, or an octet range) rather than assume it is the data most recently received. Likewise, at the end of a message, a recipient MAY treat the entire set of received trailer fields as one data structure to be considered as the message concludes. Additional processing expectations, if any, can be defined within the field specification for a field intended for use in trailers.

A #rule extension to the ABNF rules of is used to improve readability in the definitions of some list-based field values. A construct "#" is defined, similar to "*", for defining comma-delimited lists of elements. The full form is "<n>#<m>element" indicating at least <n> and at most <m> elements, each separated by a single comma (",") and optional whitespace (OWS).

In any production that uses the list construct, a sender MUST NOT generate empty list elements. In other words, a sender MUST generate lists that satisfy the following syntax: 1#element => element *( OWS "," OWS element ) and: #element => [ 1#element ] and for n >= 1 and m > 1: <n>#<m>element => element <n-1>*<m-1>( OWS "," OWS element ) shows the collected ABNF for senders after the list constructs have been expanded.

Empty elements do not contribute to the count of elements present. A recipient MUST parse and ignore a reasonable number of empty list elements: enough to handle common mistakes by senders that merge values, but not so much that they could be used as a denial-of-service mechanism. In other words, a recipient MUST accept lists that satisfy the following syntax: #element => [ element ] *( OWS "," OWS [ element ] ) Note that because of the potential presence of empty list elements, the RFC 5234 ABNF cannot enforce the cardinality of list elements, and consequently all cases are mapped as if there was no cardinality specified. For example, given these ABNF productions: example-list = 1#example-list-elmt example-list-elmt = token ; see Then the following are valid values for example-list (not including the double quotes, which are present for delimitation only): "foo,bar" "foo ,bar," "foo , ,bar,charlie" In contrast, the following values would be invalid, since at least one non-empty element is required by the example-list production: "" "," ", ,"

Many HTTP field values are defined using common syntax components, separated by whitespace or specific delimiting characters. Delimiters are chosen from the set of US-ASCII visual characters not allowed in a token (DQUOTE and "(),/:;<=>?@[\]{}"). Tokens are short textual identifiers that do not include whitespace or delimiters. token = 1*tchar tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA ; any VCHAR, except delimiters

This specification uses three rules to denote the use of linear whitespace: OWS (optional whitespace), RWS (required whitespace), and BWS ("bad" whitespace). The OWS rule is used where zero or more linear whitespace octets might appear. For protocol elements where optional whitespace is preferred to improve readability, a sender SHOULD generate the optional whitespace as a single SP; otherwise, a sender SHOULD NOT generate optional whitespace except as needed to white out invalid or unwanted protocol elements during in-place message filtering. The RWS rule is used when at least one linear whitespace octet is required to separate field tokens. A sender SHOULD generate RWS as a single SP. OWS and RWS have the same semantics as a single SP. Any content known to be defined as OWS or RWS MAY be replaced with a single SP before interpreting it or forwarding the message downstream. The BWS rule is used where the grammar allows optional whitespace only for historical reasons. A sender MUST NOT generate BWS in messages. A recipient MUST parse for such bad whitespace and remove it before interpreting the protocol element. BWS has no semantics. Any content known to be defined as BWS MAY be removed before interpreting it or forwarding the message downstream. OWS = *( SP / HTAB ) ; optional whitespace RWS = 1*( SP / HTAB ) ; required whitespace BWS = OWS ; "bad" whitespace

A string of text is parsed as a single value if it is quoted using double-quote marks. quoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE qdtext = HTAB / SP / %x21 / %x23-5B / %x5D-7E / obs-text obs-text = %x80-FF The backslash octet ("\") can be used as a single-octet quoting mechanism within quoted-string and comment constructs. Recipients that process the value of a quoted-string MUST handle a quoted-pair as if it were replaced by the octet following the backslash. quoted-pair = "\" ( HTAB / SP / VCHAR / obs-text ) A sender SHOULD NOT generate a quoted-pair in a quoted-string except where necessary to quote DQUOTE and backslash octets occurring within that string. A sender SHOULD NOT generate a quoted-pair in a comment except where necessary to quote parentheses ["(" and ")"] and backslash octets occurring within that comment.

Comments can be included in some HTTP fields by surrounding the comment text with parentheses. Comments are only allowed in fields containing "comment" as part of their field value definition. comment = "(" *( ctext / quoted-pair / comment ) ")" ctext = HTAB / SP / %x21-27 / %x2A-5B / %x5D-7E / obs-text

Parameters are zero or more instances of a name=value pair; they are often used in field values as a common syntax for appending auxiliary information to an item. Each parameter is usually delimited by an immediately preceding semicolon. parameters = *( OWS ";" OWS [ parameter ] ) parameter = parameter-name "=" parameter-value parameter-name = token parameter-value = ( token / quoted-string ) Parameter names are case-insensitive. Parameter values might or might not be case-sensitive, depending on the semantics of the parameter name. Examples of parameters and some equivalent forms can be seen in media types () and the Accept header field (). A parameter value that matches the token production can be transmitted either as a token or within a quoted-string. The quoted and unquoted values are equivalent.

Prior to 1995, there were three different formats commonly used by servers to communicate timestamps. For compatibility with old implementations, all three are defined here. The preferred format is a fixed-length and single-zone subset of the date and time specification used by the Internet Message Format . HTTP-date = IMF-fixdate / obs-date An example of the preferred format is Sun, 06 Nov 1994 08:49:37 GMT ; IMF-fixdate Examples of the two obsolete formats are Sunday, 06-Nov-94 08:49:37 GMT ; obsolete RFC 850 format Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format A recipient that parses a timestamp value in an HTTP field MUST accept all three HTTP-date formats. When a sender generates a field that contains one or more timestamps defined as HTTP-date, the sender MUST generate those timestamps in the IMF-fixdate format. An HTTP-date value represents time as an instance of Coordinated Universal Time (UTC). The first two formats indicate UTC by the three-letter abbreviation for Greenwich Mean Time, "GMT", a predecessor of the UTC name; values in the asctime format are assumed to be in UTC. A sender that generates HTTP-date values from a local clock ought to use NTP () or some similar protocol to synchronize its clock to UTC. Preferred format: IMF-fixdate = day-name "," SP date1 SP time-of-day SP GMT ; fixed length/zone/capitalization subset of the format ; see day-name = %s"Mon" / %s"Tue" / %s"Wed" / %s"Thu" / %s"Fri" / %s"Sat" / %s"Sun" date1 = day SP month SP year ; e.g., 02 Jun 1982 day = 2DIGIT month = %s"Jan" / %s"Feb" / %s"Mar" / %s"Apr" / %s"May" / %s"Jun" / %s"Jul" / %s"Aug" / %s"Sep" / %s"Oct" / %s"Nov" / %s"Dec" year = 4DIGIT GMT = %s"GMT" time-of-day = hour ":" minute ":" second ; 00:00:00 - 23:59:60 (leap second) hour = 2DIGIT minute = 2DIGIT second = 2DIGIT Obsolete formats: obs-date = rfc850-date / asctime-date rfc850-date = day-name-l "," SP date2 SP time-of-day SP GMT date2 = day "-" month "-" 2DIGIT ; e.g., 02-Jun-82 day-name-l = %s"Monday" / %s"Tuesday" / %s"Wednesday" / %s"Thursday" / %s"Friday" / %s"Saturday" / %s"Sunday" asctime-date = day-name SP date3 SP time-of-day SP year date3 = month SP ( 2DIGIT / ( SP 1DIGIT )) ; e.g., Jun 2 HTTP-date is case sensitive. A sender MUST NOT generate additional whitespace in an HTTP-date beyond that specifically included as SP in the grammar. The semantics of day-name, day, month, year, and time-of-day are the same as those defined for the Internet Message Format constructs with the corresponding name (). Recipients of a timestamp value in rfc850-date format, which uses a two-digit year, MUST interpret a timestamp that appears to be more than 50 years in the future as representing the most recent year in the past that had the same last two digits. Recipients of timestamp values are encouraged to be robust in parsing timestamps unless otherwise restricted by the field definition. For example, messages are occasionally forwarded over HTTP from a non-HTTP source that might generate any of the date and time specifications defined by the Internet Message Format.

HTTP is used in a wide variety of applications, ranging from general-purpose computers to home appliances. In some cases, communication options are hard-coded in a client's configuration. However, most HTTP clients rely on the same resource identification mechanism and configuration techniques as general-purpose Web browsers. HTTP request message routing is determined by each client based on the target resource, the client's proxy configuration, and establishment or reuse of an inbound connection. The corresponding response routing follows the same connection chain back to the client.

The "request target" is the protocol element that identifies the "target resource". Typically, the request target is a URI reference () which a user agent would resolve to its absolute form in order to obtain the "target URI". The target URI excludes the reference's fragment component, if any, since fragment identifiers are reserved for client-side processing (). However, there are two special, method-specific forms allowed for the request target in specific circumstances:

• For CONNECT (), the request target is the host name and port number of the tunnel destination, separated by a colon.
• For OPTIONS (), the request target can be a single asterisk ("*").

See the respective method definitions for details. These forms MUST NOT be used with other methods.

The "Host" header field in a request provides the host and port information from the target URI, enabling the origin server to distinguish among resources while servicing requests for multiple host names on a single IP address. Host = uri-host [ ":" port ] ; Since the Host field value is critical information for handling a request, a user agent SHOULD generate Host as the first field in the header section. For example, a GET request to the origin server for <http://www.example.org/pub/WWW/> would begin with: GET /pub/WWW/ HTTP/1.1 Host: www.example.org Since the Host header field acts as an application-level routing mechanism, it is a frequent target for malware seeking to poison a shared cache or redirect a request to an unintended server. An interception proxy is particularly vulnerable if it relies on the Host field value for redirecting requests to internal servers, or for use as a cache key in a shared cache, without first verifying that the intercepted connection is targeting a valid IP address for that host.

Once an inbound connection is obtained, the client sends an HTTP request message. Depending on the nature of the request, the client's target URI might be split into components and transmitted (or implied) within various parts of a request message. These parts are recombined by each recipient, in accordance with their local configuration and incoming connection context, to determine the target URI. defines how a server determines the target URI for an HTTP/1.1 request. Once the target URI has been reconstructed, an origin server needs to decide whether or not to provide service for that URI via the connection in which the request was received. For example, the request might have been misdirected, deliberately or accidentally, such that the information within a received Host header field differs from the host or port upon which the connection has been made. If the connection is from a trusted gateway, that inconsistency might be expected; otherwise, it might indicate an attempt to bypass security filters, trick the server into delivering non-public content, or poison a cache. See for security considerations regarding message routing.

Once the target URI and its origin are determined, a client decides whether a network request is necessary to accomplish the desired semantics and, if so, where that request is to be directed.

If the client has a cache and the request can be satisfied by it, then the request is usually directed there first.

If the request is not satisfied by a cache, then a typical client will check its configuration to determine whether a proxy is to be used to satisfy the request. Proxy configuration is implementation-dependent, but is often based on URI prefix matching, selective authority matching, or both, and the proxy itself is usually identified by an "http" or "https" URI. If a proxy is applicable, the client connects inbound by establishing (or reusing) a connection to that proxy.

If no proxy is applicable, a typical client will invoke a handler routine, usually specific to the target URI's scheme, to connect directly to an origin for the target resource. How that is accomplished is dependent on the target URI scheme and defined by its associated specification.

A connection might be used for multiple request/response exchanges. The mechanism used to correlate between request and response messages is version dependent; some versions of HTTP use implicit ordering of messages, while others use an explicit identifier. Responses (both final and interim) can be sent at any time after a request is received, even if it is not yet complete. However, clients (including intermediaries) might abandon a request if the response is not forthcoming within a reasonable period of time.

As described in , intermediaries can serve a variety of roles in the processing of HTTP requests and responses. Some intermediaries are used to improve performance or availability. Others are used for access control or to filter content. Since an HTTP stream has characteristics similar to a pipe-and-filter architecture, there are no inherent limits to the extent an intermediary can enhance (or interfere) with either direction of the stream. An intermediary not acting as a tunnel MUST implement the Connection header field, as specified in , and exclude fields from being forwarded that are only intended for the incoming connection. An intermediary MUST NOT forward a message to itself unless it is protected from an infinite request loop. In general, an intermediary ought to recognize its own server names, including any aliases, local variations, or literal IP addresses, and respond to such requests directly. An HTTP message can be parsed as a stream for incremental processing or forwarding downstream. However, recipients cannot rely on incremental delivery of partial messages, since some implementations will buffer or delay message forwarding for the sake of network efficiency, security checks, or payload transformations.

The "Connection" header field allows the sender to list desired control options for the current connection. When a field aside from Connection is used to supply control information for or about the current connection, the sender MUST list the corresponding field name within the Connection header field. Note that some versions of HTTP prohibit the use of fields for such information, and therefore do not allow the Connection field. Intermediaries MUST parse a received Connection header field before a message is forwarded and, for each connection-option in this field, remove any header or trailer field(s) from the message with the same name as the connection-option, and then remove the Connection header field itself (or replace it with the intermediary's own connection options for the forwarded message). Hence, the Connection header field provides a declarative way of distinguishing fields that are only intended for the immediate recipient ("hop-by-hop") from those fields that are intended for all recipients on the chain ("end-to-end"), enabling the message to be self-descriptive and allowing future connection-specific extensions to be deployed without fear that they will be blindly forwarded by older intermediaries. Furthermore, intermediaries SHOULD remove or replace field(s) whose semantics are known to require removal before forwarding, whether or not they appear as a Connection option, after applying those fields' semantics. This includes but is not limited to:

• Proxy-Connection ()
• Keep-Alive ()
• TE ()
• Trailer ()
• Transfer-Encoding ()
• Upgrade ()

The Connection header field's value has the following grammar: Connection = #connection-option connection-option = token Connection options are case-insensitive. A sender MUST NOT send a connection option corresponding to a field that is intended for all recipients of the payload. For example, Cache-Control is never appropriate as a connection option (). The connection options do not always correspond to a field present in the message, since a connection-specific field might not be needed if there are no parameters associated with a connection option. In contrast, a connection-specific field that is received without a corresponding connection option usually indicates that the field has been improperly forwarded by an intermediary and ought to be ignored by the recipient. When defining new connection options, specification authors ought to document it as reserved field name and register that definition in the Hypertext Transfer Protocol (HTTP) Field Name Registry (), to avoid collisions.

The "Max-Forwards" header field provides a mechanism with the TRACE () and OPTIONS () request methods to limit the number of times that the request is forwarded by proxies. This can be useful when the client is attempting to trace a request that appears to be failing or looping mid-chain. Max-Forwards = 1*DIGIT The Max-Forwards value is a decimal integer indicating the remaining number of times this request message can be forwarded. Each intermediary that receives a TRACE or OPTIONS request containing a Max-Forwards header field MUST check and update its value prior to forwarding the request. If the received value is zero (0), the intermediary MUST NOT forward the request; instead, the intermediary MUST respond as the final recipient. If the received Max-Forwards value is greater than zero, the intermediary MUST generate an updated Max-Forwards field in the forwarded message with a field value that is the lesser of a) the received value decremented by one (1) or b) the recipient's maximum supported value for Max-Forwards. A recipient MAY ignore a Max-Forwards header field received with any other request methods.

The "Via" header field indicates the presence of intermediate protocols and recipients between the user agent and the server (on requests) or between the origin server and the client (on responses), similar to the "Received" header field in email (). Via can be used for tracking message forwards, avoiding request loops, and identifying the protocol capabilities of senders along the request/response chain. Via = #( received-protocol RWS received-by [ RWS comment ] ) received-protocol = [ protocol-name "/" ] protocol-version ; see received-by = pseudonym [ ":" port ] pseudonym = token Each member of the Via field value represents a proxy or gateway that has forwarded the message. Each intermediary appends its own information about how the message was received, such that the end result is ordered according to the sequence of forwarding recipients. A proxy MUST send an appropriate Via header field, as described below, in each message that it forwards. An HTTP-to-HTTP gateway MUST send an appropriate Via header field in each inbound request message and MAY send a Via header field in forwarded response messages. For each intermediary, the received-protocol indicates the protocol and protocol version used by the upstream sender of the message. Hence, the Via field value records the advertised protocol capabilities of the request/response chain such that they remain visible to downstream recipients; this can be useful for determining what backwards-incompatible features might be safe to use in response, or within a later request, as described in . For brevity, the protocol-name is omitted when the received protocol is HTTP. The received-by portion is normally the host and optional port number of a recipient server or client that subsequently forwarded the message. However, if the real host is considered to be sensitive information, a sender MAY replace it with a pseudonym. If a port is not provided, a recipient MAY interpret that as meaning it was received on the default TCP port, if any, for the received-protocol. A sender MAY generate comments to identify the software of each recipient, analogous to the User-Agent and Server header fields. However, comments in Via are optional, and a recipient MAY remove them prior to forwarding the message. For example, a request message could be sent from an HTTP/1.0 user agent to an internal proxy code-named "fred", which uses HTTP/1.1 to forward the request to a public proxy at p.example.net, which completes the request by forwarding it to the origin server at www.example.com. The request received by www.example.com would then have the following Via header field: Via: 1.0 fred, 1.1 p.example.net An intermediary used as a portal through a network firewall SHOULD NOT forward the names and ports of hosts within the firewall region unless it is explicitly enabled to do so. If not enabled, such an intermediary SHOULD replace each received-by host of any host behind the firewall by an appropriate pseudonym for that host. An intermediary MAY combine an ordered subsequence of Via header field list members into a single member if the entries have identical received-protocol values. For example, Via: 1.0 ricky, 1.1 ethel, 1.1 fred, 1.0 lucy could be collapsed to Via: 1.0 ricky, 1.1 mertz, 1.0 lucy A sender SHOULD NOT combine multiple list members unless they are all under the same organizational control and the hosts have already been replaced by pseudonyms. A sender MUST NOT combine members that have different received-protocol values.

Some intermediaries include features for transforming messages and their payloads. A proxy might, for example, convert between image formats in order to save cache space or to reduce the amount of traffic on a slow link. However, operational problems might occur when these transformations are applied to payloads intended for critical applications, such as medical imaging or scientific data analysis, particularly when integrity checks or digital signatures are used to ensure that the payload received is identical to the original. An HTTP-to-HTTP proxy is called a "transforming proxy" if it is designed or configured to modify messages in a semantically meaningful way (i.e., modifications, beyond those required by normal HTTP processing, that change the message in a way that would be significant to the original sender or potentially significant to downstream recipients). For example, a transforming proxy might be acting as a shared annotation server (modifying responses to include references to a local annotation database), a malware filter, a format transcoder, or a privacy filter. Such transformations are presumed to be desired by whichever client (or client organization) chose the proxy. If a proxy receives a target URI with a host name that is not a fully qualified domain name, it MAY add its own domain to the host name it received when forwarding the request. A proxy MUST NOT change the host name if the target URI contains a fully qualified domain name. A proxy MUST NOT modify the "absolute-path" and "query" parts of the received target URI when forwarding it to the next inbound server, except as noted above to replace an empty path with "/" or "*". A proxy MUST NOT transform the payload () of a message that contains a no-transform cache-control response directive (). Note that this does not include changes to the message body that do not affect the payload, such as transfer codings (). A proxy MAY transform the payload of a message that does not contain a no-transform cache-control directive. A proxy that transforms the payload of a 200 (OK) response can inform downstream recipients that a transformation has been applied by changing the response status code to 203 (Non-Authoritative Information) (). A proxy SHOULD NOT modify header fields that provide information about the endpoints of the communication chain, the resource state, or the selected representation (other than the payload) unless the field's definition specifically allows such modification or the modification is deemed necessary for privacy or security.

The "Upgrade" header field is intended to provide a simple mechanism for transitioning from HTTP/1.1 to some other protocol on the same connection. A client MAY send a list of protocol names in the Upgrade header field of a request to invite the server to switch to one or more of the named protocols, in order of descending preference, before sending the final response. A server MAY ignore a received Upgrade header field if it wishes to continue using the current protocol on that connection. Upgrade cannot be used to insist on a protocol change. Upgrade = #protocol protocol = protocol-name ["/" protocol-version] protocol-name = token protocol-version = token Although protocol names are registered with a preferred case, recipients SHOULD use case-insensitive comparison when matching each protocol-name to supported protocols. A server that sends a 101 (Switching Protocols) response MUST send an Upgrade header field to indicate the new protocol(s) to which the connection is being switched; if multiple protocol layers are being switched, the sender MUST list the protocols in layer-ascending order. A server MUST NOT switch to a protocol that was not indicated by the client in the corresponding request's Upgrade header field. A server MAY choose to ignore the order of preference indicated by the client and select the new protocol(s) based on other factors, such as the nature of the request or the current load on the server. A server that sends a 426 (Upgrade Required) response MUST send an Upgrade header field to indicate the acceptable protocols, in order of descending preference. A server MAY send an Upgrade header field in any other response to advertise that it implements support for upgrading to the listed protocols, in order of descending preference, when appropriate for a future request. The following is a hypothetical example sent by a client: GET /hello HTTP/1.1 Host: www.example.com Connection: upgrade Upgrade: websocket, IRC/6.9, RTA/x11 The capabilities and nature of the application-level communication after the protocol change is entirely dependent upon the new protocol(s) chosen. However, immediately after sending the 101 (Switching Protocols) response, the server is expected to continue responding to the original request as if it had received its equivalent within the new protocol (i.e., the server still has an outstanding request to satisfy after the protocol has been changed, and is expected to do so without requiring the request to be repeated). For example, if the Upgrade header field is received in a GET request and the server decides to switch protocols, it first responds with a 101 (Switching Protocols) message in HTTP/1.1 and then immediately follows that with the new protocol's equivalent of a response to a GET on the target resource. This allows a connection to be upgraded to protocols with the same semantics as HTTP without the latency cost of an additional round trip. A server MUST NOT switch protocols unless the received message semantics can be honored by the new protocol; an OPTIONS request can be honored by any protocol. The following is an example response to the above hypothetical request: HTTP/1.1 101 Switching Protocols Connection: upgrade Upgrade: websocket [... data stream switches to websocket with an appropriate response (as defined by new protocol) to the "GET /hello" request ...] When Upgrade is sent, the sender MUST also send a Connection header field () that contains an "upgrade" connection option, in order to prevent Upgrade from being accidentally forwarded by intermediaries that might not implement the listed protocols. A server MUST ignore an Upgrade header field that is received in an HTTP/1.0 request. A client cannot begin using an upgraded protocol on the connection until it has completely sent the request message (i.e., the client can't change the protocol it is sending in the middle of a message). If a server receives both an Upgrade and an Expect header field with the "100-continue" expectation (), the server MUST send a 100 (Continue) response before sending a 101 (Switching Protocols) response. The Upgrade header field only applies to switching protocols on top of the existing connection; it cannot be used to switch the underlying connection (transport) protocol, nor to switch the existing communication to a different connection. For those purposes, it is more appropriate to use a 3xx (Redirection) response (). This specification only defines the protocol name "HTTP" for use by the family of Hypertext Transfer Protocols, as defined by the HTTP version rules of and future updates to this specification. Additional protocol names ought to be registered using the registration procedure defined in .

A "representation" is information that is intended to reflect a past, current, or desired state of a given resource, in a format that can be readily communicated via the protocol. A representation consists of a set of representation metadata and a potentially unbounded stream of representation data. HTTP allows "information hiding" behind its uniform interface by phrasing communication with respect to a transferable representation of the resource state, rather than transferring the resource itself. This allows the resource identified by a URI to be anything, including temporal functions like "the current weather in Laguna Beach", while potentially providing information that represents that resource at the time a message is generated . The uniform interface is similar to a window through which one can observe and act upon a thing only through the communication of messages to an independent actor on the other side. A shared abstraction is needed to represent ("take the place of") the current or desired state of that thing in our communications. When a representation is hypertext, it can provide both a representation of the resource state and processing instructions that help guide the recipient's future interactions.

An origin server might be provided with, or be capable of generating, multiple representations that are each intended to reflect the current state of a target resource. In such cases, some algorithm is used by the origin server to select one of those representations as most applicable to a given request, usually based on content negotiation. This "selected representation" is used to provide the data and metadata for evaluating conditional requests () and constructing the payload for 200 (OK), 206 (Partial Content), and 304 (Not Modified) responses to GET ().

The representation data associated with an HTTP message is either provided as the payload body of the message or referred to by the message semantics and the target URI. The representation data is in a format and encoding defined by the representation metadata header fields. The data type of the representation data is determined via the header fields Content-Type and Content-Encoding. These define a two-layer, ordered encoding model: representation-data := Content-Encoding( Content-Type( bits ) )

Representation header fields provide metadata about the representation. When a message includes a payload body, the representation header fields describe how to interpret the representation data enclosed in the payload body. In a response to a HEAD request, the representation header fields describe the representation data that would have been enclosed in the payload body if the same request had been a GET. The following header fields convey representation metadata:

Field Name	Ref.
Content-Type
Content-Encoding
Content-Language
Content-Length
Content-Location

The "Content-Type" header field indicates the media type of the associated representation: either the representation enclosed in the message payload or the selected representation, as determined by the message semantics. The indicated media type defines both the data format and how that data is intended to be processed by a recipient, within the scope of the received message semantics, after any content codings indicated by Content-Encoding are decoded. Content-Type = media-type Media types are defined in . An example of the field is Content-Type: text/html; charset=ISO-8859-4 A sender that generates a message containing a payload body SHOULD generate a Content-Type header field in that message unless the intended media type of the enclosed representation is unknown to the sender. If a Content-Type header field is not present, the recipient MAY either assume a media type of "application/octet-stream" () or examine the data to determine its type. In practice, resource owners do not always properly configure their origin server to provide the correct Content-Type for a given representation. Some user agents examine a payload's content and, in certain cases, override the received type (for example, see ). This "MIME sniffing" risks drawing incorrect conclusions about the data, which might expose the user to additional security risks (e.g., "privilege escalation"). Furthermore, it is impossible to determine the sender's intended processing model by examining the data format: many data formats match multiple media types that differ only in processing semantics. Implementers are encouraged to provide a means to disable such sniffing. Furthermore, although Content-Type is defined as a singleton field, it is sometimes incorrectly generated multiple times, resulting in a combined field value that appears to be a list. Recipients often attempt to handle this error by using the last syntactically valid member of the list, but note that some implementations might have different error handling behaviors, leading to interoperability and/or security issues.

HTTP uses media types in the Content-Type () and Accept () header fields in order to provide open and extensible data typing and type negotiation. Media types define both a data format and various processing models: how to process that data in accordance with each context in which it is received. media-type = type "/" subtype parameters type = token subtype = token The type and subtype tokens are case-insensitive. The type/subtype MAY be followed by semicolon-delimited parameters () in the form of name=value pairs. The presence or absence of a parameter might be significant to the processing of a media type, depending on its definition within the media type registry. Parameter values might or might not be case-sensitive, depending on the semantics of the parameter name. For example, the following media types are equivalent in describing HTML text data encoded in the UTF-8 character encoding scheme, but the first is preferred for consistency (the "charset" parameter value is defined as being case-insensitive in ): text/html;charset=utf-8 Text/HTML;Charset="utf-8" text/html; charset="utf-8" text/html;charset=UTF-8 Media types ought to be registered with IANA according to the procedures defined in .

HTTP uses charset names to indicate or negotiate the character encoding scheme of a textual representation . A charset is identified by a case-insensitive token. charset = token Charset names ought to be registered in the IANA "Character Sets" registry () according to the procedures defined in .

Media types are registered with a canonical form in order to be interoperable among systems with varying native encoding formats. Representations selected or transferred via HTTP ought to be in canonical form, for many of the same reasons described by the Multipurpose Internet Mail Extensions (MIME) . However, the performance characteristics of email deployments (i.e., store and forward messages to peers) are significantly different from those common to HTTP and the Web (server-based information services). Furthermore, MIME's constraints for the sake of compatibility with older mail transfer protocols do not apply to HTTP (see ). MIME's canonical form requires that media subtypes of the "text" type use CRLF as the text line break. HTTP allows the transfer of text media with plain CR or LF alone representing a line break, when such line breaks are consistent for an entire representation. An HTTP sender MAY generate, and a recipient MUST be able to parse, line breaks in text media that consist of CRLF, bare CR, or bare LF. In addition, text media in HTTP is not limited to charsets that use octets 13 and 10 for CR and LF, respectively. This flexibility regarding line breaks applies only to text within a representation that has been assigned a "text" media type; it does not apply to "multipart" types or HTTP elements outside the payload body (e.g., header fields). If a representation is encoded with a content-coding, the underlying data ought to be in a form defined above prior to being encoded.

MIME provides for a number of "multipart" types — encapsulations of one or more representations within a single message body. All multipart types share a common syntax, as defined in , and include a boundary parameter as part of the media type value. The message body is itself a protocol element; a sender MUST generate only CRLF to represent line breaks between body parts. HTTP message framing does not use the multipart boundary as an indicator of message body length, though it might be used by implementations that generate or process the payload. For example, the "multipart/form-data" type is often used for carrying form data in a request, as described in , and the "multipart/byteranges" type is defined by this specification for use in some 206 (Partial Content) responses (see ).

The "Content-Encoding" header field indicates what content codings have been applied to the representation, beyond those inherent in the media type, and thus what decoding mechanisms have to be applied in order to obtain data in the media type referenced by the Content-Type header field. Content-Encoding is primarily used to allow a representation's data to be compressed without losing the identity of its underlying media type. Content-Encoding = #content-coding An example of its use is Content-Encoding: gzip If one or more encodings have been applied to a representation, the sender that applied the encodings MUST generate a Content-Encoding header field that lists the content codings in the order in which they were applied. Note that the coding named "identity" is reserved for its special role in Accept-Encoding, and thus SHOULD NOT be included. Additional information about the encoding parameters can be provided by other header fields not defined by this specification. Unlike Transfer-Encoding (), the codings listed in Content-Encoding are a characteristic of the representation; the representation is defined in terms of the coded form, and all other metadata about the representation is about the coded form unless otherwise noted in the metadata definition. Typically, the representation is only decoded just prior to rendering or analogous usage. If the media type includes an inherent encoding, such as a data format that is always compressed, then that encoding would not be restated in Content-Encoding even if it happens to be the same algorithm as one of the content codings. Such a content coding would only be listed if, for some bizarre reason, it is applied a second time to form the representation. Likewise, an origin server might choose to publish the same data as multiple representations that differ only in whether the coding is defined as part of Content-Type or Content-Encoding, since some user agents will behave differently in their handling of each response (e.g., open a "Save as ..." dialog instead of automatic decompression and rendering of content). An origin server MAY respond with a status code of 415 (Unsupported Media Type) if a representation in the request message has a content coding that is not acceptable.

Content coding values indicate an encoding transformation that has been or can be applied to a representation. Content codings are primarily used to allow a representation to be compressed or otherwise usefully transformed without losing the identity of its underlying media type and without loss of information. Frequently, the representation is stored in coded form, transmitted directly, and only decoded by the final recipient. content-coding = token All content codings are case-insensitive and ought to be registered within the "HTTP Content Coding Registry", as described in Content-coding values are used in the Accept-Encoding () and Content-Encoding () header fields. The following content-coding values are defined by this specification:

Name	Description	Ref.
compress	UNIX "compress" data format
deflate	"deflate" compressed data () inside the "zlib" data format ()
gzip	GZIP file format
identity	Reserved
x-compress	Deprecated (alias for compress)
x-gzip	Deprecated (alias for gzip)

The "compress" coding is an adaptive Lempel-Ziv-Welch (LZW) coding that is commonly produced by the UNIX file compression program "compress". A recipient SHOULD consider "x-compress" to be equivalent to "compress".

The "deflate" coding is a "zlib" data format containing a "deflate" compressed data stream that uses a combination of the Lempel-Ziv (LZ77) compression algorithm and Huffman coding.

The "gzip" coding is an LZ77 coding with a 32-bit Cyclic Redundancy Check (CRC) that is commonly produced by the gzip file compression program . A recipient SHOULD consider "x-gzip" to be equivalent to "gzip".

The "Content-Language" header field describes the natural language(s) of the intended audience for the representation. Note that this might not be equivalent to all the languages used within the representation. Content-Language = #language-tag Language tags are defined in . The primary purpose of Content-Language is to allow a user to identify and differentiate representations according to the users' own preferred language. Thus, if the content is intended only for a Danish-literate audience, the appropriate field is Content-Language: da If no Content-Language is specified, the default is that the content is intended for all language audiences. This might mean that the sender does not consider it to be specific to any natural language, or that the sender does not know for which language it is intended. Multiple languages MAY be listed for content that is intended for multiple audiences. For example, a rendition of the "Treaty of Waitangi", presented simultaneously in the original Maori and English versions, would call for Content-Language: mi, en However, just because multiple languages are present within a representation does not mean that it is intended for multiple linguistic audiences. An example would be a beginner's language primer, such as "A First Lesson in Latin", which is clearly intended to be used by an English-literate audience. In this case, the Content-Language would properly only include "en". Content-Language MAY be applied to any media type — it is not limited to textual documents.

A language tag, as defined in , identifies a natural language spoken, written, or otherwise conveyed by human beings for communication of information to other human beings. Computer languages are explicitly excluded. HTTP uses language tags within the Accept-Language and Content-Language header fields. Accept-Language uses the broader language-range production defined in , whereas Content-Language uses the language-tag production defined below. language-tag = <Language-Tag, see > A language tag is a sequence of one or more case-insensitive subtags, each separated by a hyphen character ("-", %x2D). In most cases, a language tag consists of a primary language subtag that identifies a broad family of related languages (e.g., "en" = English), which is optionally followed by a series of subtags that refine or narrow that language's range (e.g., "en-CA" = the variety of English as communicated in Canada). Whitespace is not allowed within a language tag. Example tags include: fr, en-US, es-419, az-Arab, x-pig-latin, man-Nkoo-GN See for further information.

The "Content-Length" header field indicates the associated representation's data length as a decimal non-negative integer number of octets. When transferring a representation in a message, Content-Length refers specifically to the amount of data enclosed so that it can be used to delimit framing of the message body (e.g., ). In other cases, Content-Length indicates the selected representation's current length, which can be used by recipients to estimate transfer time or compare to previously stored representations. Content-Length = 1*DIGIT An example is Content-Length: 3495 A sender MUST NOT send a Content-Length header field in any message that contains a Transfer-Encoding header field. A user agent SHOULD send a Content-Length in a request message when no Transfer-Encoding is sent and the request method defines a meaning for an enclosed payload body. For example, a Content-Length header field is normally sent in a POST request even when the value is 0 (indicating an empty payload body). A user agent SHOULD NOT send a Content-Length header field when the request message does not contain a payload body and the method semantics do not anticipate such a body. A server MAY send a Content-Length header field in a response to a HEAD request (); a server MUST NOT send Content-Length in such a response unless its field value equals the decimal number of octets that would have been sent in the payload body of a response if the same request had used the GET method. A server MAY send a Content-Length header field in a 304 (Not Modified) response to a conditional GET request (); a server MUST NOT send Content-Length in such a response unless its field value equals the decimal number of octets that would have been sent in the payload body of a 200 (OK) response to the same request. A server MUST NOT send a Content-Length header field in any response with a status code of 1xx (Informational) or 204 (No Content). A server MUST NOT send a Content-Length header field in any 2xx (Successful) response to a CONNECT request (). Aside from the cases defined above, in the absence of Transfer-Encoding, an origin server SHOULD send a Content-Length header field when the payload body size is known prior to sending the complete header section. This will allow downstream recipients to measure transfer progress, know when a received message is complete, and potentially reuse the connection for additional requests. Any Content-Length field value greater than or equal to zero is valid. Since there is no predefined limit to the length of a payload, a recipient MUST anticipate potentially large decimal numerals and prevent parsing errors due to integer conversion overflows (). If a message is received that has a Content-Length header field value consisting of the same decimal value as a comma-separated list () — for example, "Content-Length: 42, 42" — indicating that duplicate Content-Length header fields have been generated or combined by an upstream message processor, then the recipient MUST either reject the message as invalid or replace the duplicated field values with a single valid Content-Length field containing that decimal value prior to determining the message body length or forwarding the message.

The "Content-Location" header field references a URI that can be used as an identifier for a specific resource corresponding to the representation in this message's payload. In other words, if one were to perform a GET request on this URI at the time of this message's generation, then a 200 (OK) response would contain the same representation that is enclosed as payload in this message. Content-Location = absolute-URI / partial-URI The field value is either an absolute-URI or a partial-URI. In the latter case (), the referenced URI is relative to the target URI (). The Content-Location value is not a replacement for the target URI (). It is representation metadata. It has the same syntax and semantics as the header field of the same name defined for MIME body parts in . However, its appearance in an HTTP message has some special implications for HTTP recipients. If Content-Location is included in a 2xx (Successful) response message and its value refers (after conversion to absolute form) to a URI that is the same as the target URI, then the recipient MAY consider the payload to be a current representation of that resource at the time indicated by the message origination date. For a GET () or HEAD () request, this is the same as the default semantics when no Content-Location is provided by the server. For a state-changing request like PUT () or POST (), it implies that the server's response contains the new representation of that resource, thereby distinguishing it from representations that might only report about the action (e.g., "It worked!"). This allows authoring applications to update their local copies without the need for a subsequent GET request. If Content-Location is included in a 2xx (Successful) response message and its field value refers to a URI that differs from the target URI, then the origin server claims that the URI is an identifier for a different resource corresponding to the enclosed representation. Such a claim can only be trusted if both identifiers share the same resource owner, which cannot be programmatically determined via HTTP.

• For a response to a GET or HEAD request, this is an indication that the target URI refers to a resource that is subject to content negotiation and the Content-Location field value is a more specific identifier for the selected representation.
• For a 201 (Created) response to a state-changing method, a Content-Location field value that is identical to the Location field value indicates that this payload is a current representation of the newly created resource.
• Otherwise, such a Content-Location indicates that this payload is a representation reporting on the requested action's status and that the same report is available (for future access with GET) at the given URI. For example, a purchase transaction made via a POST request might include a receipt document as the payload of the 200 (OK) response; the Content-Location field value provides an identifier for retrieving a copy of that same receipt in the future.

A user agent that sends Content-Location in a request message is stating that its value refers to where the user agent originally obtained the content of the enclosed representation (prior to any modifications made by that user agent). In other words, the user agent is providing a back link to the source of the original representation. An origin server that receives a Content-Location field in a request message MUST treat the information as transitory request context rather than as metadata to be saved verbatim as part of the representation. An origin server MAY use that context to guide in processing the request or to save it for other uses, such as within source links or versioning metadata. However, an origin server MUST NOT use such context information to alter the request semantics. For example, if a client makes a PUT request on a negotiated resource and the origin server accepts that PUT (without redirection), then the new state of that resource is expected to be consistent with the one representation supplied in that PUT; the Content-Location cannot be used as a form of reverse content selection identifier to update only one of the negotiated representations. If the user agent had wanted the latter semantics, it would have applied the PUT directly to the Content-Location URI.

Validator header fields convey metadata about the selected representation (). In responses to safe requests, validator fields describe the selected representation chosen by the origin server while handling the response. Note that, depending on the status code semantics, the selected representation for a given response is not necessarily the same as the representation enclosed as response payload. In a successful response to a state-changing request, validator fields describe the new representation that has replaced the prior selected representation as a result of processing the request. For example, an ETag field in a 201 (Created) response communicates the entity-tag of the newly created resource's representation, so that it can be used in later conditional requests to prevent the "lost update" problem .

Field Name	Ref.
ETag
Last-Modified

This specification defines two forms of metadata that are commonly used to observe resource state and test for preconditions: modification dates () and opaque entity tags (). Additional metadata that reflects resource state has been defined by various extensions of HTTP, such as Web Distributed Authoring and Versioning (WebDAV, ), that are beyond the scope of this specification. A resource metadata value is referred to as a "validator" when it is used within a precondition.

Validators come in two flavors: strong or weak. Weak validators are easy to generate but are far less useful for comparisons. Strong validators are ideal for comparisons but can be very difficult (and occasionally impossible) to generate efficiently. Rather than impose that all forms of resource adhere to the same strength of validator, HTTP exposes the type of validator in use and imposes restrictions on when weak validators can be used as preconditions. A "strong validator" is representation metadata that changes value whenever a change occurs to the representation data that would be observable in the payload body of a 200 (OK) response to GET. A strong validator might change for reasons other than a change to the representation data, such as when a semantically significant part of the representation metadata is changed (e.g., Content-Type), but it is in the best interests of the origin server to only change the value when it is necessary to invalidate the stored responses held by remote caches and authoring tools. Cache entries might persist for arbitrarily long periods, regardless of expiration times. Thus, a cache might attempt to validate an entry using a validator that it obtained in the distant past. A strong validator is unique across all versions of all representations associated with a particular resource over time. However, there is no implication of uniqueness across representations of different resources (i.e., the same strong validator might be in use for representations of multiple resources at the same time and does not imply that those representations are equivalent). There are a variety of strong validators used in practice. The best are based on strict revision control, wherein each change to a representation always results in a unique node name and revision identifier being assigned before the representation is made accessible to GET. A collision-resistant hash function applied to the representation data is also sufficient if the data is available prior to the response header fields being sent and the digest does not need to be recalculated every time a validation request is received. However, if a resource has distinct representations that differ only in their metadata, such as might occur with content negotiation over media types that happen to share the same data format, then the origin server needs to incorporate additional information in the validator to distinguish those representations. In contrast, a "weak validator" is representation metadata that might not change for every change to the representation data. This weakness might be due to limitations in how the value is calculated, such as clock resolution, an inability to ensure uniqueness for all possible representations of the resource, or a desire of the resource owner to group representations by some self-determined set of equivalency rather than unique sequences of data. An origin server SHOULD change a weak entity-tag whenever it considers prior representations to be unacceptable as a substitute for the current representation. In other words, a weak entity-tag ought to change whenever the origin server wants caches to invalidate old responses. For example, the representation of a weather report that changes in content every second, based on dynamic measurements, might be grouped into sets of equivalent representations (from the origin server's perspective) with the same weak validator in order to allow cached representations to be valid for a reasonable period of time (perhaps adjusted dynamically based on server load or weather quality). Likewise, a representation's modification time, if defined with only one-second resolution, might be a weak validator if it is possible for the representation to be modified twice during a single second and retrieved between those modifications. Likewise, a validator is weak if it is shared by two or more representations of a given resource at the same time, unless those representations have identical representation data. For example, if the origin server sends the same validator for a representation with a gzip content coding applied as it does for a representation with no content coding, then that validator is weak. However, two simultaneous representations might share the same strong validator if they differ only in the representation metadata, such as when two different media types are available for the same representation data. Strong validators are usable for all conditional requests, including cache validation, partial content ranges, and "lost update" avoidance. Weak validators are only usable when the client does not require exact equality with previously obtained representation data, such as when validating a cache entry or limiting a web traversal to recent changes.

The "Last-Modified" header field in a response provides a timestamp indicating the date and time at which the origin server believes the selected representation was last modified, as determined at the conclusion of handling the request. Last-Modified = HTTP-date An example of its use is Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT

An origin server SHOULD send Last-Modified for any selected representation for which a last modification date can be reasonably and consistently determined, since its use in conditional requests and evaluating cache freshness () results in a substantial reduction of HTTP traffic on the Internet and can be a significant factor in improving service scalability and reliability. A representation is typically the sum of many parts behind the resource interface. The last-modified time would usually be the most recent time that any of those parts were changed. How that value is determined for any given resource is an implementation detail beyond the scope of this specification. What matters to HTTP is how recipients of the Last-Modified header field can use its value to make conditional requests and test the validity of locally cached responses. An origin server SHOULD obtain the Last-Modified value of the representation as close as possible to the time that it generates the Date field value for its response. This allows a recipient to make an accurate assessment of the representation's modification time, especially if the representation changes near the time that the response is generated. An origin server with a clock MUST NOT send a Last-Modified date that is later than the server's time of message origination (Date). If the last modification time is derived from implementation-specific metadata that evaluates to some time in the future, according to the origin server's clock, then the origin server MUST replace that value with the message origination date. This prevents a future modification date from having an adverse impact on cache validation. An origin server without a clock MUST NOT assign Last-Modified values to a response unless these values were associated with the resource by some other system or user with a reliable clock.

A Last-Modified time, when used as a validator in a request, is implicitly weak unless it is possible to deduce that it is strong, using the following rules:

• The validator is being compared by an origin server to the actual current validator for the representation and,
• That origin server reliably knows that the associated representation did not change twice during the second covered by the presented validator.

or

• The validator is about to be used by a client in an If-Modified-Since, If-Unmodified-Since, or If-Range header field, because the client has a cache entry for the associated representation, and
• That cache entry includes a Date value, which gives the time when the origin server sent the original response, and
• The presented Last-Modified time is at least 60 seconds before the Date value.

or

• The validator is being compared by an intermediate cache to the validator stored in its cache entry for the representation, and
• That cache entry includes a Date value, which gives the time when the origin server sent the original response, and
• The presented Last-Modified time is at least 60 seconds before the Date value.

This method relies on the fact that if two different responses were sent by the origin server during the same second, but both had the same Last-Modified time, then at least one of those responses would have a Date value equal to its Last-Modified time. The arbitrary 60-second limit guards against the possibility that the Date and Last-Modified values are generated from different clocks or at somewhat different times during the preparation of the response. An implementation MAY use a value larger than 60 seconds, if it is believed that 60 seconds is too short.

The "ETag" field in a response provides the current entity-tag for the selected representation, as determined at the conclusion of handling the request. An entity-tag is an opaque validator for differentiating between multiple representations of the same resource, regardless of whether those multiple representations are due to resource state changes over time, content negotiation resulting in multiple representations being valid at the same time, or both. An entity-tag consists of an opaque quoted string, possibly prefixed by a weakness indicator. ETag = entity-tag entity-tag = [ weak ] opaque-tag weak = %s"W/" opaque-tag = DQUOTE *etagc DQUOTE etagc = %x21 / %x23-7E / obs-text ; VCHAR except double quotes, plus obs-text An entity-tag can be more reliable for validation than a modification date in situations where it is inconvenient to store modification dates, where the one-second resolution of HTTP date values is not sufficient, or where modification dates are not consistently maintained. Examples: ETag: "xyzzy" ETag: W/"xyzzy" ETag: "" An entity-tag can be either a weak or strong validator, with strong being the default. If an origin server provides an entity-tag for a representation and the generation of that entity-tag does not satisfy all of the characteristics of a strong validator (), then the origin server MUST mark the entity-tag as weak by prefixing its opaque value with "W/" (case-sensitive). A sender MAY send the Etag field in a trailer section (see ). However, since trailers are often ignored, it is preferable to send Etag as a header field unless the entity-tag is generated while sending the message body.

The principle behind entity-tags is that only the service author knows the implementation of a resource well enough to select the most accurate and efficient validation mechanism for that resource, and that any such mechanism can be mapped to a simple sequence of octets for easy comparison. Since the value is opaque, there is no need for the client to be aware of how each entity-tag is constructed. For example, a resource that has implementation-specific versioning applied to all changes might use an internal revision number, perhaps combined with a variance identifier for content negotiation, to accurately differentiate between representations. Other implementations might use a collision-resistant hash of representation content, a combination of various file attributes, or a modification timestamp that has sub-second resolution. An origin server SHOULD send an ETag for any selected representation for which detection of changes can be reasonably and consistently determined, since the entity-tag's use in conditional requests and evaluating cache freshness () can result in a substantial reduction of HTTP network traffic and can be a significant factor in improving service scalability and reliability.

There are two entity-tag comparison functions, depending on whether or not the comparison context allows the use of weak validators:

• Strong comparison: two entity-tags are equivalent if both are not weak and their opaque-tags match character-by-character.
• Weak comparison: two entity-tags are equivalent if their opaque-tags match character-by-character, regardless of either or both being tagged as "weak".

The example below shows the results for a set of entity-tag pairs and both the weak and strong comparison function results:

ETag 1	ETag 2	Strong Comparison	Weak Comparison
W/"1"	W/"1"	no match	match
W/"1"	W/"2"	no match	no match
W/"1"	"1"	no match	match
"1"	"1"	match	match

Consider a resource that is subject to content negotiation (), and where the representations sent in response to a GET request vary based on the Accept-Encoding request header field (): >> Request: GET /index HTTP/1.1 Host: www.example.com Accept-Encoding: gzip In this case, the response might or might not use the gzip content coding. If it does not, the response might look like: >> Response: HTTP/1.1 200 OK Date: Fri, 26 Mar 2010 00:05:00 GMT ETag: "123-a" Content-Length: Vary: Accept-Encoding Content-Type: text/plain Hello World! Hello World! Hello World! Hello World! Hello World! An alternative representation that does use gzip content coding would be: >> Response: HTTP/1.1 200 OK Date: Fri, 26 Mar 2010 00:05:00 GMT ETag: "123-b" Content-Length: 43 Vary: Accept-Encoding Content-Type: text/plain Content-Encoding: gzip ...binary data...

In 200 (OK) responses to GET or HEAD, an origin server:

• SHOULD send an entity-tag validator unless it is not feasible to generate one.
• MAY send a weak entity-tag instead of a strong entity-tag, if performance considerations support the use of weak entity-tags, or if it is unfeasible to send a strong entity-tag.
• SHOULD send a Last-Modified value if it is feasible to send one.

In other words, the preferred behavior for an origin server is to send both a strong entity-tag and a Last-Modified value in successful responses to a retrieval request. A client:

• MUST send that entity-tag in any cache validation request (using If-Match or If-None-Match) if an entity-tag has been provided by the origin server.
• SHOULD send the Last-Modified value in non-subrange cache validation requests (using If-Modified-Since) if only a Last-Modified value has been provided by the origin server.
• MAY send the Last-Modified value in subrange cache validation requests (using If-Unmodified-Since) if only a Last-Modified value has been provided by an HTTP/1.0 origin server. The user agent SHOULD provide a way to disable this, in case of difficulty.
• SHOULD send both validators in cache validation requests if both an entity-tag and a Last-Modified value have been provided by the origin server. This allows both HTTP/1.0 and HTTP/1.1 caches to respond appropriately.

The request method token is the primary source of request semantics; it indicates the purpose for which the client has made this request and what is expected by the client as a successful result. The request method's semantics might be further specialized by the semantics of some header fields when present in a request if those additional semantics do not conflict with the method. For example, a client can send conditional request header fields () to make the requested action conditional on the current state of the target resource. method = token HTTP was originally designed to be usable as an interface to distributed object systems. The request method was envisioned as applying semantics to a target resource in much the same way as invoking a defined method on an identified object would apply semantics. The method token is case-sensitive because it might be used as a gateway to object-based systems with case-sensitive method names. By convention, standardized methods are defined in all-uppercase US-ASCII letters. Unlike distributed objects, the standardized request methods in HTTP are not resource-specific, since uniform interfaces provide for better visibility and reuse in network-based systems . Once defined, a standardized method ought to have the same semantics when applied to any resource, though each resource determines for itself whether those semantics are implemented or allowed. This specification defines a number of standardized methods that are commonly used in HTTP, as outlined by the following table.

Method	Description	Ref.
GET	Transfer a current representation of the target resource.
HEAD	Same as GET, but do not transfer the response body.
POST	Perform resource-specific processing on the request payload.
PUT	Replace all current representations of the target resource with the request payload.
DELETE	Remove all current representations of the target resource.
CONNECT	Establish a tunnel to the server identified by the target resource.
OPTIONS	Describe the communication options for the target resource.
TRACE	Perform a message loop-back test along the path to the target resource.

All general-purpose servers MUST support the methods GET and HEAD. All other methods are OPTIONAL. The set of methods allowed by a target resource can be listed in an Allow header field (). However, the set of allowed methods can change dynamically. When a request method is received that is unrecognized or not implemented by an origin server, the origin server SHOULD respond with the 501 (Not Implemented) status code. When a request method is received that is known by an origin server but not allowed for the target resource, the origin server SHOULD respond with the 405 (Method Not Allowed) status code. Additional methods, outside the scope of this specification, have been specified for use in HTTP. All such methods ought to be registered within the "Hypertext Transfer Protocol (HTTP) Method Registry", as described in .

Request methods are considered "safe" if their defined semantics are essentially read-only; i.e., the client does not request, and does not expect, any state change on the origin server as a result of applying a safe method to a target resource. Likewise, reasonable use of a safe method is not expected to cause any harm, loss of property, or unusual burden on the origin server. This definition of safe methods does not prevent an implementation from including behavior that is potentially harmful, that is not entirely read-only, or that causes side effects while invoking a safe method. What is important, however, is that the client did not request that additional behavior and cannot be held accountable for it. For example, most servers append request information to access log files at the completion of every response, regardless of the method, and that is considered safe even though the log storage might become full and crash the server. Likewise, a safe request initiated by selecting an advertisement on the Web will often have the side effect of charging an advertising account. Of the request methods defined by this specification, the GET, HEAD, OPTIONS, and TRACE methods are defined to be safe. The purpose of distinguishing between safe and unsafe methods is to allow automated retrieval processes (spiders) and cache performance optimization (pre-fetching) to work without fear of causing harm. In addition, it allows a user agent to apply appropriate constraints on the automated use of unsafe methods when processing potentially untrusted content. A user agent SHOULD distinguish between safe and unsafe methods when presenting potential actions to a user, such that the user can be made aware of an unsafe action before it is requested. When a resource is constructed such that parameters within the target URI have the effect of selecting an action, it is the resource owner's responsibility to ensure that the action is consistent with the request method semantics. For example, it is common for Web-based content editing software to use actions within query parameters, such as "page?do=delete". If the purpose of such a resource is to perform an unsafe action, then the resource owner MUST disable or disallow that action when it is accessed using a safe request method. Failure to do so will result in unfortunate side effects when automated processes perform a GET on every URI reference for the sake of link maintenance, pre-fetching, building a search index, etc.

A request method is considered "idempotent" if the intended effect on the server of multiple identical requests with that method is the same as the effect for a single such request. Of the request methods defined by this specification, PUT, DELETE, and safe request methods are idempotent. Like the definition of safe, the idempotent property only applies to what has been requested by the user; a server is free to log each request separately, retain a revision control history, or implement other non-idempotent side effects for each idempotent request. Idempotent methods are distinguished because the request can be repeated automatically if a communication failure occurs before the client is able to read the server's response. For example, if a client sends a PUT request and the underlying connection is closed before any response is received, then the client can establish a new connection and retry the idempotent request. It knows that repeating the request will have the same intended effect, even if the original request succeeded, though the response might differ. A client SHOULD NOT automatically retry a request with a non-idempotent method unless it has some means to know that the request semantics are actually idempotent, regardless of the method, or some means to detect that the original request was never applied. For example, a user agent that knows (through design or configuration) that a POST request to a given resource is safe can repeat that request automatically. Likewise, a user agent designed specifically to operate on a version control repository might be able to recover from partial failure conditions by checking the target resource revision(s) after a failed connection, reverting or fixing any changes that were partially applied, and then automatically retrying the requests that failed. Some clients use weaker signals to initiate automatic retries. For example, when a POST request is sent, but the underlying transport connection is closed before any part of the response is received. Although this is commonly implemented, it is not recommended. A proxy MUST NOT automatically retry non-idempotent requests. A client SHOULD NOT automatically retry a failed automatic retry.

For a cache to store and use a response, the associated method needs to explicitly allow caching, and detail under what conditions a response can be used to satisfy subsequent requests; a method definition which does not do so cannot be cached. For additional requirements see . This specification defines caching semantics for GET, HEAD, and POST, although the overwhelming majority of cache implementations only support GET and HEAD.

yes yes The GET method requests transfer of a current selected representation for the target resource. GET is the primary mechanism of information retrieval and the focus of almost all performance optimizations. Hence, when people speak of retrieving some identifiable information via HTTP, they are generally referring to making a GET request. A successful response reflects the quality of "sameness" identified by the target URI. In turn, constructing applications such that they produce a URI for each important resource results in more resources being available for other applications, producing a network effect that promotes further expansion of the Web. It is tempting to think of resource identifiers as remote file system pathnames and of representations as being a copy of the contents of such files. In fact, that is how many resources are implemented (see for related security considerations). However, there are no such limitations in practice. The HTTP interface for a resource is just as likely to be implemented as a tree of content objects, a programmatic view on various database records, or a gateway to other information systems. Even when the URI mapping mechanism is tied to a file system, an origin server might be configured to execute the files with the request as input and send the output as the representation rather than transfer the files directly. Regardless, only the origin server needs to know how each of its resource identifiers corresponds to an implementation and how each implementation manages to select and send a current representation of the target resource in a response to GET. A client can alter the semantics of GET to be a "range request", requesting transfer of only some part(s) of the selected representation, by sending a Range header field in the request (). A client SHOULD NOT generate a body in a GET request. A payload received in a GET request has no defined semantics, cannot alter the meaning or target of the request, and might lead some implementations to reject the request and close the connection because of its potential as a request smuggling attack (). The response to a GET request is cacheable; a cache MAY use it to satisfy subsequent GET and HEAD requests unless otherwise indicated by the Cache-Control header field (). A cache that receives a payload in a GET request is likely to ignore that payload and cache regardless of the payload contents. When information retrieval is performed with a mechanism that constructs a target URI from user-provided information, such as the query fields of a form using GET, potentially sensitive data might be provided that would not be appropriate for disclosure within a URI (see ). In some cases, the data can be filtered or transformed such that it would not reveal such information. In others, particularly when there is no benefit from caching a response, using the POST method () instead of GET will usually transmit such information in the request body rather than construct a new URI.

yes yes The HEAD method is identical to GET except that the server MUST NOT send a message body in the response (i.e., the response terminates at the end of the header section). The server SHOULD send the same header fields in response to a HEAD request as it would have sent if the request had been a GET, except that the payload header fields () MAY be omitted. This method can be used for obtaining metadata about the selected representation without transferring the representation data and is often used for testing hypertext links for validity, accessibility, and recent modification. A payload within a HEAD request message has no defined semantics; sending a payload body on a HEAD request might cause some existing implementations to reject the request. The response to a HEAD request is cacheable; a cache MAY use it to satisfy subsequent HEAD requests unless otherwise indicated by the Cache-Control header field (). A HEAD response might also have an effect on previously cached responses to GET; see .

The POST method requests that the target resource process the representation enclosed in the request according to the resource's own specific semantics. For example, POST is used for the following functions (among others):

• Providing a block of data, such as the fields entered into an HTML form, to a data-handling process;
• Posting a message to a bulletin board, newsgroup, mailing list, blog, or similar group of articles;
• Creating a new resource that has yet to be identified by the origin server; and
• Appending data to a resource's existing representation(s).

An origin server indicates response semantics by choosing an appropriate status code depending on the result of processing the POST request; almost all of the status codes defined by this specification could be received in a response to POST (the exceptions being 206 (Partial Content), 304 (Not Modified), and 416 (Range Not Satisfiable)). If one or more resources has been created on the origin server as a result of successfully processing a POST request, the origin server SHOULD send a 201 (Created) response containing a Location header field that provides an identifier for the primary resource created () and a representation that describes the status of the request while referring to the new resource(s). Responses to POST requests are only cacheable when they include explicit freshness information (see ) and a Content-Location header field that has the same value as the POST's target URI (). A cached POST response can be reused to satisfy a later GET or HEAD request, but not a POST request, since POST is required to be written through to the origin server, because it is unsafe; see . If the result of processing a POST would be equivalent to a representation of an existing resource, an origin server MAY redirect the user agent to that resource by sending a 303 (See Other) response with the existing resource's identifier in the Location field. This has the benefits of providing the user agent a resource identifier and transferring the representation via a method more amenable to shared caching, though at the cost of an extra request if the user agent does not already have the representation cached.

yes The PUT method requests that the state of the target resource be created or replaced with the state defined by the representation enclosed in the request message payload. A successful PUT of a given representation would suggest that a subsequent GET on that same target resource will result in an equivalent representation being sent in a 200 (OK) response. However, there is no guarantee that such a state change will be observable, since the target resource might be acted upon by other user agents in parallel, or might be subject to dynamic processing by the origin server, before any subsequent GET is received. A successful response only implies that the user agent's intent was achieved at the time of its processing by the origin server. If the target resource does not have a current representation and the PUT successfully creates one, then the origin server MUST inform the user agent by sending a 201 (Created) response. If the target resource does have a current representation and that representation is successfully modified in accordance with the state of the enclosed representation, then the origin server MUST send either a 200 (OK) or a 204 (No Content) response to indicate successful completion of the request. An origin server SHOULD ignore unrecognized header and trailer fields received in a PUT request (i.e., do not save them as part of the resource state). An origin server SHOULD verify that the PUT representation is consistent with any constraints the server has for the target resource that cannot or will not be changed by the PUT. This is particularly important when the origin server uses internal configuration information related to the URI in order to set the values for representation metadata on GET responses. When a PUT representation is inconsistent with the target resource, the origin server SHOULD either make them consistent, by transforming the representation or changing the resource configuration, or respond with an appropriate error message containing sufficient information to explain why the representation is unsuitable. The 409 (Conflict) or 415 (Unsupported Media Type) status codes are suggested, with the latter being specific to constraints on Content-Type values. For example, if the target resource is configured to always have a Content-Type of "text/html" and the representation being PUT has a Content-Type of "image/jpeg", the origin server ought to do one of:

1. reconfigure the target resource to reflect the new media type;
2. transform the PUT representation to a format consistent with that of the resource before saving it as the new resource state; or,
3. reject the request with a 415 (Unsupported Media Type) response indicating that the target resource is limited to "text/html", perhaps including a link to a different resource that would be a suitable target for the new representation.

HTTP does not define exactly how a PUT method affects the state of an origin server beyond what can be expressed by the intent of the user agent request and the semantics of the origin server response. It does not define what a resource might be, in any sense of that word, beyond the interface provided via HTTP. It does not define how resource state is "stored", nor how such storage might change as a result of a change in resource state, nor how the origin server translates resource state into representations. Generally speaking, all implementation details behind the resource interface are intentionally hidden by the server. An origin server MUST NOT send a validator header field (), such as an ETag or Last-Modified field, in a successful response to PUT unless the request's representation data was saved without any transformation applied to the body (i.e., the resource's new representation data is identical to the representation data received in the PUT request) and the validator field value reflects the new representation. This requirement allows a user agent to know when the representation body it has in memory remains current as a result of the PUT, thus not in need of being retrieved again from the origin server, and that the new validator(s) received in the response can be used for future conditional requests in order to prevent accidental overwrites (). The fundamental difference between the POST and PUT methods is highlighted by the different intent for the enclosed representation. The target resource in a POST request is intended to handle the enclosed representation according to the resource's own semantics, whereas the enclosed representation in a PUT request is defined as replacing the state of the target resource. Hence, the intent of PUT is idempotent and visible to intermediaries, even though the exact effect is only known by the origin server. Proper interpretation of a PUT request presumes that the user agent knows which target resource is desired. A service that selects a proper URI on behalf of the client, after receiving a state-changing request, SHOULD be implemented using the POST method rather than PUT. If the origin server will not make the requested PUT state change to the target resource and instead wishes to have it applied to a different resource, such as when the resource has been moved to a different URI, then the origin server MUST send an appropriate 3xx (Redirection) response; the user agent MAY then make its own decision regarding whether or not to redirect the request. A PUT request applied to the target resource can have side effects on other resources. For example, an article might have a URI for identifying "the current version" (a resource) that is separate from the URIs identifying each particular version (different resources that at one point shared the same state as the current version resource). A successful PUT request on "the current version" URI might therefore create a new version resource in addition to changing the state of the target resource, and might also cause links to be added between the related resources. An origin server that allows PUT on a given target resource MUST send a 400 (Bad Request) response to a PUT request that contains a Content-Range header field (), since the payload is likely to be partial content that has been mistakenly PUT as a full representation. Partial content updates are possible by targeting a separately identified resource with state that overlaps a portion of the larger resource, or by using a different method that has been specifically defined for partial updates (for example, the PATCH method defined in ). Responses to the PUT method are not cacheable. If a successful PUT request passes through a cache that has one or more stored responses for the target URI, those stored responses will be invalidated (see ).

yes The DELETE method requests that the origin server remove the association between the target resource and its current functionality. In effect, this method is similar to the rm command in UNIX: it expresses a deletion operation on the URI mapping of the origin server rather than an expectation that the previously associated information be deleted. If the target resource has one or more current representations, they might or might not be destroyed by the origin server, and the associated storage might or might not be reclaimed, depending entirely on the nature of the resource and its implementation by the origin server (which are beyond the scope of this specification). Likewise, other implementation aspects of a resource might need to be deactivated or archived as a result of a DELETE, such as database or gateway connections. In general, it is assumed that the origin server will only allow DELETE on resources for which it has a prescribed mechanism for accomplishing the deletion. Relatively few resources allow the DELETE method — its primary use is for remote authoring environments, where the user has some direction regarding its effect. For example, a resource that was previously created using a PUT request, or identified via the Location header field after a 201 (Created) response to a POST request, might allow a corresponding DELETE request to undo those actions. Similarly, custom user agent implementations that implement an authoring function, such as revision control clients using HTTP for remote operations, might use DELETE based on an assumption that the server's URI space has been crafted to correspond to a version repository. If a DELETE method is successfully applied, the origin server SHOULD send

• a 202 (Accepted) status code if the action will likely succeed but has not yet been enacted,
• a 204 (No Content) status code if the action has been enacted and no further information is to be supplied, or
• a 200 (OK) status code if the action has been enacted and the response message includes a representation describing the status.

A client SHOULD NOT generate a body in a DELETE request. A payload received in a DELETE request has no defined semantics, cannot alter the meaning or target of the request, and might lead some implementations to reject the request. Responses to the DELETE method are not cacheable. If a successful DELETE request passes through a cache that has one or more stored responses for the target URI, those stored responses will be invalidated (see ).

The CONNECT method requests that the recipient establish a tunnel to the destination origin server identified by the request target and, if successful, thereafter restrict its behavior to blind forwarding of data, in both directions, until the tunnel is closed. Tunnels are commonly used to create an end-to-end virtual connection, through one or more proxies, which can then be secured using TLS (Transport Layer Security, ). Because CONNECT changes the request/response nature of an HTTP connection, specific HTTP versions might have different ways of mapping its semantics into the protocol's wire format. CONNECT is intended only for use in requests to a proxy. An origin server that receives a CONNECT request for itself MAY respond with a 2xx (Successful) status code to indicate that a connection is established. However, most origin servers do not implement CONNECT. A client sending a CONNECT request MUST send the authority component (described in Section 3.2 of ) as the request target; i.e., the request target consists of only the host name and port number of the tunnel destination, separated by a colon. For example, CONNECT server.example.com:80 HTTP/1.1 Host: server.example.com:80 The recipient proxy can establish a tunnel either by directly connecting to the request target or, if configured to use another proxy, by forwarding the CONNECT request to the next inbound proxy. Any 2xx (Successful) response indicates that the sender (and all inbound proxies) will switch to tunnel mode immediately after the blank line that concludes the successful response's header section; data received after that blank line is from the server identified by the request target. Any response other than a successful response indicates that the tunnel has not yet been formed and that the connection remains governed by HTTP. A tunnel is closed when a tunnel intermediary detects that either side has closed its connection: the intermediary MUST attempt to send any outstanding data that came from the closed side to the other side, close both connections, and then discard any remaining data left undelivered. Proxy authentication might be used to establish the authority to create a tunnel. For example, CONNECT server.example.com:80 HTTP/1.1 Host: server.example.com:80 Proxy-Authorization: basic aGVsbG86d29ybGQ= There are significant risks in establishing a tunnel to arbitrary servers, particularly when the destination is a well-known or reserved TCP port that is not intended for Web traffic. For example, a CONNECT to "example.com:25" would suggest that the proxy connect to the reserved port for SMTP traffic; if allowed, that could trick the proxy into relaying spam email. Proxies that support CONNECT SHOULD restrict its use to a limited set of known ports or a configurable whitelist of safe request targets. A server MUST NOT send any Transfer-Encoding or Content-Length header fields in a 2xx (Successful) response to CONNECT. A client MUST ignore any Content-Length or Transfer-Encoding header fields received in a successful response to CONNECT. A payload within a CONNECT request message has no defined semantics; sending a payload body on a CONNECT request might cause some existing implementations to reject the request. Responses to the CONNECT method are not cacheable.

yes yes The OPTIONS method requests information about the communication options available for the target resource, at either the origin server or an intervening intermediary. This method allows a client to determine the options and/or requirements associated with a resource, or the capabilities of a server, without implying a resource action. An OPTIONS request with an asterisk ("*") as the request target () applies to the server in general rather than to a specific resource. Since a server's communication options typically depend on the resource, the "*" request is only useful as a "ping" or "no-op" type of method; it does nothing beyond allowing the client to test the capabilities of the server. For example, this can be used to test a proxy for HTTP/1.1 conformance (or lack thereof). If the request target is not an asterisk, the OPTIONS request applies to the options that are available when communicating with the target resource. A server generating a successful response to OPTIONS SHOULD send any header that might indicate optional features implemented by the server and applicable to the target resource (e.g., Allow), including potential extensions not defined by this specification. The response payload, if any, might also describe the communication options in a machine or human-readable representation. A standard format for such a representation is not defined by this specification, but might be defined by future extensions to HTTP. A client MAY send a Max-Forwards header field in an OPTIONS request to target a specific recipient in the request chain (see ). A proxy MUST NOT generate a Max-Forwards header field while forwarding a request unless that request was received with a Max-Forwards field. A client that generates an OPTIONS request containing a payload body MUST send a valid Content-Type header field describing the representation media type. Note that this specification does not define any use for such a payload. Responses to the OPTIONS method are not cacheable.

yes yes The TRACE method requests a remote, application-level loop-back of the request message. The final recipient of the request SHOULD reflect the message received, excluding some fields described below, back to the client as the message body of a 200 (OK) response with a Content-Type of "message/http" (). The final recipient is either the origin server or the first server to receive a Max-Forwards value of zero (0) in the request (). A client MUST NOT generate fields in a TRACE request containing sensitive data that might be disclosed by the response. For example, it would be foolish for a user agent to send stored user credentials or cookies in a TRACE request. The final recipient of the request SHOULD exclude any request fields that are likely to contain sensitive data when that recipient generates the response body. TRACE allows the client to see what is being received at the other end of the request chain and use that data for testing or diagnostic information. The value of the Via header field () is of particular interest, since it acts as a trace of the request chain. Use of the Max-Forwards header field allows the client to limit the length of the request chain, which is useful for testing a chain of proxies forwarding messages in an infinite loop. A client MUST NOT send a message body in a TRACE request. Responses to the TRACE method are not cacheable.

A client sends request header fields to provide more information about the request context, make the request conditional based on the target resource state, suggest preferred formats for the response, supply authentication credentials, or modify the expected request processing. These fields act as request modifiers, similar to the parameters on a programming language method invocation. The following request header fields provide additional information about the request context, including information about the user, user agent, and resource behind the request.

Field Name	Ref.
Expect
From
Referer
TE
Trailer
User-Agent

The "Expect" header field in a request indicates a certain set of behaviors (expectations) that need to be supported by the server in order to properly handle this request. Expect = #expectation expectation = token [ "=" ( token / quoted-string ) parameters ] The Expect field value is case-insensitive. The only expectation defined by this specification is "100-continue" (with no defined parameters). A server that receives an Expect field value containing a member other than 100-continue MAY respond with a 417 (Expectation Failed) status code to indicate that the unexpected expectation cannot be met. A 100-continue expectation informs recipients that the client is about to send a (presumably large) message body in this request and wishes to receive a 100 (Continue) interim response if the method, target URI, and header fields are not sufficient to cause an immediate success, redirect, or error response. This allows the client to wait for an indication that it is worthwhile to send the message body before actually doing so, which can improve efficiency when the message body is huge or when the client anticipates that an error is likely (e.g., when sending a state-changing method, for the first time, without previously verified authentication credentials). For example, a request that begins with PUT /somewhere/fun HTTP/1.1 Host: origin.example.com Content-Type: video/h264 Content-Length: 1234567890987 Expect: 100-continue allows the origin server to immediately respond with an error message, such as 401 (Unauthorized) or 405 (Method Not Allowed), before the client starts filling the pipes with an unnecessary data transfer. Requirements for clients:

• A client MUST NOT generate a 100-continue expectation in a request that does not include a message body.
• A client that will wait for a 100 (Continue) response before sending the request message body MUST send an Expect header field containing a 100-continue expectation.
• A client that sends a 100-continue expectation is not required to wait for any specific length of time; such a client MAY proceed to send the message body even if it has not yet received a response. Furthermore, since 100 (Continue) responses cannot be sent through an HTTP/1.0 intermediary, such a client SHOULD NOT wait for an indefinite period before sending the message body.
• A client that receives a 417 (Expectation Failed) status code in response to a request containing a 100-continue expectation SHOULD repeat that request without a 100-continue expectation, since the 417 response merely indicates that the response chain does not support expectations (e.g., it passes through an HTTP/1.0 server).

Requirements for servers:

• A server that receives a 100-continue expectation in an HTTP/1.0 request MUST ignore that expectation.
• A server MAY omit sending a 100 (Continue) response if it has already received some or all of the message body for the corresponding request, or if the framing indicates that there is no message body.
• A server that sends a 100 (Continue) response MUST ultimately send a final status code, once the message body is received and processed, unless the connection is closed prematurely.
• A server that responds with a final status code before reading the entire request payload body SHOULD indicate whether it intends to close the connection (e.g., see ) or continue reading the payload body.

An origin server MUST, upon receiving an HTTP/1.1 (or later) request that has a method, target URI, and complete header section that contains a 100-continue expectation and indicates a request message body will follow, either send an immediate response with a final status code, if that status can be determined by examining just the method, target URI, and header fields, or send an immediate 100 (Continue) response to encourage the client to send the request's message body. The origin server MUST NOT wait for the message body before sending the 100 (Continue) response. A proxy MUST, upon receiving an HTTP/1.1 (or later) request that has a method, target URI, and complete header section that contains a 100-continue expectation and indicates a request message body will follow, either send an immediate response with a final status code, if that status can be determined by examining just the method, target URI, and header fields, or begin forwarding the request toward the origin server by sending a corresponding request-line and header section to the next inbound server. If the proxy believes (from configuration or past interaction) that the next inbound server only supports HTTP/1.0, the proxy MAY generate an immediate 100 (Continue) response to encourage the client to begin sending the message body.

The "From" header field contains an Internet email address for a human user who controls the requesting user agent. The address ought to be machine-usable, as defined by "mailbox" in : From = mailbox mailbox = <mailbox, see > An example is: From: webmaster@example.org The From header field is rarely sent by non-robotic user agents. A user agent SHOULD NOT send a From header field without explicit configuration by the user, since that might conflict with the user's privacy interests or their site's security policy. A robotic user agent SHOULD send a valid From header field so that the person responsible for running the robot can be contacted if problems occur on servers, such as if the robot is sending excessive, unwanted, or invalid requests. A server SHOULD NOT use the From header field for access control or authentication, since most recipients will assume that the field value is public information.

The "Referer" [sic] header field allows the user agent to specify a URI reference for the resource from which the target URI was obtained (i.e., the "referrer", though the field name is misspelled). A user agent MUST NOT include the fragment and userinfo components of the URI reference , if any, when generating the Referer field value. Referer = absolute-URI / partial-URI The field value is either an absolute-URI or a partial-URI. In the latter case (), the referenced URI is relative to the target URI (). The Referer header field allows servers to generate back-links to other resources for simple analytics, logging, optimized caching, etc. It also allows obsolete or mistyped links to be found for maintenance. Some servers use the Referer header field as a means of denying links from other sites (so-called "deep linking") or restricting cross-site request forgery (CSRF), but not all requests contain it. Example: Referer: http://www.example.org/hypertext/Overview.html If the target URI was obtained from a source that does not have its own URI (e.g., input from the user keyboard, or an entry within the user's bookmarks/favorites), the user agent MUST either exclude the Referer field or send it with a value of "about:blank". The Referer field has the potential to reveal information about the request context or browsing history of the user, which is a privacy concern if the referring resource's identifier reveals personal information (such as an account name) or a resource that is supposed to be confidential (such as behind a firewall or internal to a secured service). Most general-purpose user agents do not send the Referer header field when the referring resource is a local "file" or "data" URI. A user agent MUST NOT send a Referer header field in an unsecured HTTP request if the referring page was received with a secure protocol. See for additional security considerations. Some intermediaries have been known to indiscriminately remove Referer header fields from outgoing requests. This has the unfortunate side effect of interfering with protection against CSRF attacks, which can be far more harmful to their users. Intermediaries and user agent extensions that wish to limit information disclosure in Referer ought to restrict their changes to specific edits, such as replacing internal domain names with pseudonyms or truncating the query and/or path components. An intermediary SHOULD NOT modify or delete the Referer header field when the field value shares the same scheme and host as the target URI.

The "TE" header field in a request can be used to indicate that the sender will not discard trailer fields when it contains a "trailers" member, as described in . Additionally, specific HTTP versions can use it to indicate the transfer codings the client is willing to accept in the response. The TE field-value consists of a list of tokens, each allowing for optional parameters (as described in ). TE = #t-codings t-codings = "trailers" / ( transfer-coding [ t-ranking ] ) t-ranking = OWS ";" OWS "q=" rank rank = ( "0" [ "." 0*3DIGIT ] ) / ( "1" [ "." 0*3("0") ] )

The "Trailer" header field provides a list of field names that the sender anticipates sending as trailer fields within that message. This allows a recipient to prepare for receipt of the indicated metadata before it starts processing the body. Trailer = #field-name For example, a sender might indicate that a message integrity check will be computed as the payload is being streamed and provide the final signature as a trailer field. This allows a recipient to perform the same check on the fly as the payload data is received. A sender that intends to generate one or more trailer fields in a message SHOULD generate a Trailer header field in the header section of that message to indicate which fields might be present in the trailers.

The "User-Agent" header field contains information about the user agent originating the request, which is often used by servers to help identify the scope of reported interoperability problems, to work around or tailor responses to avoid particular user agent limitations, and for analytics regarding browser or operating system use. A user agent SHOULD send a User-Agent field in each request unless specifically configured not to do so. User-Agent = product *( RWS ( product / comment ) ) The User-Agent field value consists of one or more product identifiers, each followed by zero or more comments (), which together identify the user agent software and its significant subproducts. By convention, the product identifiers are listed in decreasing order of their significance for identifying the user agent software. Each product identifier consists of a name and optional version. product = token ["/" product-version] product-version = token A sender SHOULD limit generated product identifiers to what is necessary to identify the product; a sender MUST NOT generate advertising or other nonessential information within the product identifier. A sender SHOULD NOT generate information in product-version that is not a version identifier (i.e., successive versions of the same product name ought to differ only in the product-version portion of the product identifier). Example: User-Agent: CERN-LineMode/2.15 libwww/2.17b3 A user agent SHOULD NOT generate a User-Agent field containing needlessly fine-grained detail and SHOULD limit the addition of subproducts by third parties. Overly long and detailed User-Agent field values increase request latency and the risk of a user being identified against their wishes ("fingerprinting"). Likewise, implementations are encouraged not to use the product tokens of other implementations in order to declare compatibility with them, as this circumvents the purpose of the field. If a user agent masquerades as a different user agent, recipients can assume that the user intentionally desires to see responses tailored for that identified user agent, even if they might not work as well for the actual user agent being used.

Response header fields can supply control data that supplements the status code, directs caching, or instructs the client where to go next. The response header fields allow the server to pass additional information about the response beyond the status code. These header fields give information about the server, about further access to the target resource, or about related resources. Although each response header field has a defined meaning, in general, the precise semantics might be further refined by the semantics of the request method and/or response status code. The remaining response header fields provide more information about the target resource for potential use in later requests.

Field Name	Ref.
Allow
Date
Location
Retry-After
Server

The "Allow" header field lists the set of methods advertised as supported by the target resource. The purpose of this field is strictly to inform the recipient of valid request methods associated with the resource. Allow = #method Example of use: Allow: GET, HEAD, PUT The actual set of allowed methods is defined by the origin server at the time of each request. An origin server MUST generate an Allow field in a 405 (Method Not Allowed) response and MAY do so in any other response. An empty Allow field value indicates that the resource allows no methods, which might occur in a 405 response if the resource has been temporarily disabled by configuration. A proxy MUST NOT modify the Allow header field — it does not need to understand all of the indicated methods in order to handle them according to the generic message handling rules.

The "Date" header field represents the date and time at which the message was originated, having the same semantics as the Origination Date Field (orig-date) defined in . The field value is an HTTP-date, as defined in . Date = HTTP-date An example is Date: Tue, 15 Nov 1994 08:12:31 GMT When a Date header field is generated, the sender SHOULD generate its field value as the best available approximation of the date and time of message generation. In theory, the date ought to represent the moment just before the payload is generated. In practice, the date can be generated at any time during message origination. An origin server MUST NOT send a Date header field if it does not have a clock capable of providing a reasonable approximation of the current instance in Coordinated Universal Time. An origin server MAY send a Date header field if the response is in the 1xx (Informational) or 5xx (Server Error) class of status codes. An origin server MUST send a Date header field in all other cases. A recipient with a clock that receives a response message without a Date header field MUST record the time it was received and append a corresponding Date header field to the message's header section if it is cached or forwarded downstream. A user agent MAY send a Date header field in a request, though generally will not do so unless it is believed to convey useful information to the server. For example, custom applications of HTTP might convey a Date if the server is expected to adjust its interpretation of the user's request based on differences between the user agent and server clocks.

The "Location" header field is used in some responses to refer to a specific resource in relation to the response. The type of relationship is defined by the combination of request method and status code semantics. Location = URI-reference The field value consists of a single URI-reference. When it has the form of a relative reference (), the final value is computed by resolving it against the target URI (). For 201 (Created) responses, the Location value refers to the primary resource created by the request. For 3xx (Redirection) responses, the Location value refers to the preferred target resource for automatically redirecting the request. If the Location value provided in a 3xx (Redirection) response does not have a fragment component, a user agent MUST process the redirection as if the value inherits the fragment component of the URI reference used to generate the target URI (i.e., the redirection inherits the original reference's fragment, if any). For example, a GET request generated for the URI reference "http://www.example.org/~tim" might result in a 303 (See Other) response containing the header field: Location: /People.html#tim which suggests that the user agent redirect to "http://www.example.org/People.html#tim" Likewise, a GET request generated for the URI reference "http://www.example.org/index.html#larry" might result in a 301 (Moved Permanently) response containing the header field: Location: http://www.example.net/index.html which suggests that the user agent redirect to "http://www.example.net/index.html#larry", preserving the original fragment identifier. There are circumstances in which a fragment identifier in a Location value would not be appropriate. For example, the Location header field in a 201 (Created) response is supposed to provide a URI that is specific to the created resource.

Servers send the "Retry-After" header field to indicate how long the user agent ought to wait before making a follow-up request. When sent with a 503 (Service Unavailable) response, Retry-After indicates how long the service is expected to be unavailable to the client. When sent with any 3xx (Redirection) response, Retry-After indicates the minimum time that the user agent is asked to wait before issuing the redirected request. The value of this field can be either an HTTP-date or a number of seconds to delay after the response is received. Retry-After = HTTP-date / delay-seconds A delay-seconds value is a non-negative decimal integer, representing time in seconds. delay-seconds = 1*DIGIT Two examples of its use are Retry-After: Fri, 31 Dec 1999 23:59:59 GMT Retry-After: 120 In the latter example, the delay is 2 minutes.

The "Server" header field contains information about the software used by the origin server to handle the request, which is often used by clients to help identify the scope of reported interoperability problems, to work around or tailor requests to avoid particular server limitations, and for analytics regarding server or operating system use. An origin server MAY generate a Server field in its responses. Server = product *( RWS ( product / comment ) ) The Server field value consists of one or more product identifiers, each followed by zero or more comments (), which together identify the origin server software and its significant subproducts. By convention, the product identifiers are listed in decreasing order of their significance for identifying the origin server software. Each product identifier consists of a name and optional version, as defined in . Example: Server: CERN/3.0 libwww/2.17 An origin server SHOULD NOT generate a Server field containing needlessly fine-grained detail and SHOULD limit the addition of subproducts by third parties. Overly long and detailed Server field values increase response latency and potentially reveal internal implementation details that might make it (slightly) easier for attackers to find and exploit known security holes.

HTTP provides a general framework for access control and authentication, via an extensible set of challenge-response authentication schemes, which can be used by a server to challenge a client request and by a client to provide authentication information. It uses a case-insensitive token to identify the authentication scheme auth-scheme = token Aside from the general framework, this document does not specify any authentication schemes. New and existing authentication schemes are specified independently and ought to be registered within the "Hypertext Transfer Protocol (HTTP) Authentication Scheme Registry". For example, the "basic" and "digest" authentication schemes are defined by RFC 7617 and RFC 7616, respectively.

The authentication scheme is followed by additional information necessary for achieving authentication via that scheme as either a comma-separated list of parameters or a single sequence of characters capable of holding base64-encoded information. token68 = 1*( ALPHA / DIGIT / "-" / "." / "_" / "~" / "+" / "/" ) *"=" The token68 syntax allows the 66 unreserved URI characters (), plus a few others, so that it can hold a base64, base64url (URL and filename safe alphabet), base32, or base16 (hex) encoding, with or without padding, but excluding whitespace (). Authentication parameters are name=value pairs, where the name token is matched case-insensitively and each parameter name MUST only occur once per challenge. auth-param = token BWS "=" BWS ( token / quoted-string ) Parameter values can be expressed either as "token" or as "quoted-string" (). Authentication scheme definitions need to accept both notations, both for senders and recipients, to allow recipients to use generic parsing components regardless of the authentication scheme. For backwards compatibility, authentication scheme definitions can restrict the format for senders to one of the two variants. This can be important when it is known that deployed implementations will fail when encountering one of the two formats.

A 401 (Unauthorized) response message is used by an origin server to challenge the authorization of a user agent, including a WWW-Authenticate header field containing at least one challenge applicable to the requested resource. A 407 (Proxy Authentication Required) response message is used by a proxy to challenge the authorization of a client, including a Proxy-Authenticate header field containing at least one challenge applicable to the proxy for the requested resource. challenge = auth-scheme [ 1*SP ( token68 / #auth-param ) ] A user agent that wishes to authenticate itself with an origin server — usually, but not necessarily, after receiving a 401 (Unauthorized) — can do so by including an Authorization header field with the request. A client that wishes to authenticate itself with a proxy — usually, but not necessarily, after receiving a 407 (Proxy Authentication Required) — can do so by including a Proxy-Authorization header field with the request.

Both the Authorization field value and the Proxy-Authorization field value contain the client's credentials for the realm of the resource being requested, based upon a challenge received in a response (possibly at some point in the past). When creating their values, the user agent ought to do so by selecting the challenge with what it considers to be the most secure auth-scheme that it understands, obtaining credentials from the user as appropriate. Transmission of credentials within header field values implies significant security considerations regarding the confidentiality of the underlying connection, as described in . credentials = auth-scheme [ 1*SP ( token68 / #auth-param ) ] Upon receipt of a request for a protected resource that omits credentials, contains invalid credentials (e.g., a bad password) or partial credentials (e.g., when the authentication scheme requires more than one round trip), an origin server SHOULD send a 401 (Unauthorized) response that contains a WWW-Authenticate header field with at least one (possibly new) challenge applicable to the requested resource. Likewise, upon receipt of a request that omits proxy credentials or contains invalid or partial proxy credentials, a proxy that requires authentication SHOULD generate a 407 (Proxy Authentication Required) response that contains a Proxy-Authenticate header field with at least one (possibly new) challenge applicable to the proxy. A server that receives valid credentials that are not adequate to gain access ought to respond with the 403 (Forbidden) status code (). HTTP does not restrict applications to this simple challenge-response framework for access authentication. Additional mechanisms can be used, such as authentication at the transport level or via message encapsulation, and with additional header fields specifying authentication information. However, such additional mechanisms are not defined by this specification. Note that various custom mechanisms for user authentication use the Set-Cookie and Cookie header fields, defined in , for passing tokens related to authentication.

The "realm" authentication parameter is reserved for use by authentication schemes that wish to indicate a scope of protection. A protection space is defined by the canonical root URI (the scheme and authority components of the target URI; see ) of the server being accessed, in combination with the realm value if present. These realms allow the protected resources on a server to be partitioned into a set of protection spaces, each with its own authentication scheme and/or authorization database. The realm value is a string, generally assigned by the origin server, that can have additional semantics specific to the authentication scheme. Note that a response can have multiple challenges with the same auth-scheme but with different realms. The protection space determines the domain over which credentials can be automatically applied. If a prior request has been authorized, the user agent MAY reuse the same credentials for all other requests within that protection space for a period of time determined by the authentication scheme, parameters, and/or user preferences (such as a configurable inactivity timeout). Unless specifically allowed by the authentication scheme, a single protection space cannot extend outside the scope of its server. For historical reasons, a sender MUST only generate the quoted-string syntax. Recipients might have to support both token and quoted-string syntax for maximum interoperability with existing clients that have been accepting both notations for a long time.

The "WWW-Authenticate" header field indicates the authentication scheme(s) and parameters applicable to the target resource. WWW-Authenticate = #challenge A server generating a 401 (Unauthorized) response MUST send a WWW-Authenticate header field containing at least one challenge. A server MAY generate a WWW-Authenticate header field in other response messages to indicate that supplying credentials (or different credentials) might affect the response. A proxy forwarding a response MUST NOT modify any WWW-Authenticate fields in that response. User agents are advised to take special care in parsing the field value, as it might contain more than one challenge, and each challenge can contain a comma-separated list of authentication parameters. Furthermore, the header field itself can occur multiple times. For instance: WWW-Authenticate: Newauth realm="apps", type=1, title="Login to \"apps\"", Basic realm="simple" This header field contains two challenges; one for the "Newauth" scheme with a realm value of "apps", and two additional parameters "type" and "title", and another one for the "Basic" scheme with a realm value of "simple". Some user agents do not recognise this form, however. As a result, sending a WWW-Authenticate field value with more than one member on the same field line might not be interoperable.

The "Authorization" header field allows a user agent to authenticate itself with an origin server — usually, but not necessarily, after receiving a 401 (Unauthorized) response. Its value consists of credentials containing the authentication information of the user agent for the realm of the resource being requested. Authorization = credentials If a request is authenticated and a realm specified, the same credentials are presumed to be valid for all other requests within this realm (assuming that the authentication scheme itself does not require otherwise, such as credentials that vary according to a challenge value or using synchronized clocks). A proxy forwarding a request MUST NOT modify any Authorization fields in that request. See for details of and requirements pertaining to handling of the Authorization field by HTTP caches.

HTTP authentication schemes can use the Authentication-Info response header field to communicate information after the client's authentication credentials have been accepted. This information can include a finalization message from the server (e.g., it can contain the server authentication). The field value is a list of parameters (name/value pairs), using the "auth-param" syntax defined in . This specification only describes the generic format; authentication schemes using Authentication-Info will define the individual parameters. The "Digest" Authentication Scheme, for instance, defines multiple parameters in . Authentication-Info = #auth-param The Authentication-Info header field can be used in any HTTP response, independently of request method and status code. Its semantics are defined by the authentication scheme indicated by the Authorization header field () of the corresponding request. A proxy forwarding a response is not allowed to modify the field value in any way. Authentication-Info can be sent as a trailer field () when the authentication scheme explicitly allows this.

The "Proxy-Authenticate" header field consists of at least one challenge that indicates the authentication scheme(s) and parameters applicable to the proxy for this request. A proxy MUST send at least one Proxy-Authenticate header field in each 407 (Proxy Authentication Required) response that it generates. Proxy-Authenticate = #challenge Unlike WWW-Authenticate, the Proxy-Authenticate header field applies only to the next outbound client on the response chain. This is because only the client that chose a given proxy is likely to have the credentials necessary for authentication. However, when multiple proxies are used within the same administrative domain, such as office and regional caching proxies within a large corporate network, it is common for credentials to be generated by the user agent and passed through the hierarchy until consumed. Hence, in such a configuration, it will appear as if Proxy-Authenticate is being forwarded because each proxy will send the same challenge set. Note that the parsing considerations for WWW-Authenticate apply to this header field as well; see for details.

The "Proxy-Authorization" header field allows the client to identify itself (or its user) to a proxy that requires authentication. Its value consists of credentials containing the authentication information of the client for the proxy and/or realm of the resource being requested. Proxy-Authorization = credentials Unlike Authorization, the Proxy-Authorization header field applies only to the next inbound proxy that demanded authentication using the Proxy-Authenticate field. When multiple proxies are used in a chain, the Proxy-Authorization header field is consumed by the first inbound proxy that was expecting to receive credentials. A proxy MAY relay the credentials from the client request to the next proxy if that is the mechanism by which the proxies cooperatively authenticate a given request.

The Proxy-Authentication-Info response header field is equivalent to Authentication-Info, except that it applies to proxy authentication () and its semantics are defined by the authentication scheme indicated by the Proxy-Authorization header field () of the corresponding request: Proxy-Authentication-Info = #auth-param However, unlike Authentication-Info, the Proxy-Authentication-Info header field applies only to the next outbound client on the response chain. This is because only the client that chose a given proxy is likely to have the credentials necessary for authentication. However, when multiple proxies are used within the same administrative domain, such as office and regional caching proxies within a large corporate network, it is common for credentials to be generated by the user agent and passed through the hierarchy until consumed. Hence, in such a configuration, it will appear as if Proxy-Authentication-Info is being forwarded because each proxy will send the same field value.

When responses convey payload information, whether indicating a success or an error, the origin server often has different ways of representing that information; for example, in different formats, languages, or encodings. Likewise, different users or user agents might have differing capabilities, characteristics, or preferences that could influence which representation, among those available, would be best to deliver. For this reason, HTTP provides mechanisms for content negotiation. This specification defines three patterns of content negotiation that can be made visible within the protocol: "proactive" negotiation, where the server selects the representation based upon the user agent's stated preferences, "reactive" negotiation, where the server provides a list of representations for the user agent to choose from, and "request payload" negotiation, where the user agent selects the representation for a future request based upon the server's stated preferences in past responses. Other patterns of content negotiation include "conditional content", where the representation consists of multiple parts that are selectively rendered based on user agent parameters, "active content", where the representation contains a script that makes additional (more specific) requests based on the user agent characteristics, and "Transparent Content Negotiation" (), where content selection is performed by an intermediary. These patterns are not mutually exclusive, and each has trade-offs in applicability and practicality. Note that, in all cases, HTTP is not aware of the resource semantics. The consistency with which an origin server responds to requests, over time and over the varying dimensions of content negotiation, and thus the "sameness" of a resource's observed representations over time, is determined entirely by whatever entity or algorithm selects or generates those responses.

When content negotiation preferences are sent by the user agent in a request to encourage an algorithm located at the server to select the preferred representation, it is called proactive negotiation (a.k.a., server-driven negotiation). Selection is based on the available representations for a response (the dimensions over which it might vary, such as language, content-coding, etc.) compared to various information supplied in the request, including both the explicit negotiation fields below and implicit characteristics, such as the client's network address or parts of the User-Agent field. Proactive negotiation is advantageous when the algorithm for selecting from among the available representations is difficult to describe to a user agent, or when the server desires to send its "best guess" to the user agent along with the first response (hoping to avoid the round trip delay of a subsequent request if the "best guess" is good enough for the user). In order to improve the server's guess, a user agent MAY send request header fields that describe its preferences. Proactive negotiation has serious disadvantages:

• It is impossible for the server to accurately determine what might be "best" for any given user, since that would require complete knowledge of both the capabilities of the user agent and the intended use for the response (e.g., does the user want to view it on screen or print it on paper?);
• Having the user agent describe its capabilities in every request can be both very inefficient (given that only a small percentage of responses have multiple representations) and a potential risk to the user's privacy;
• It complicates the implementation of an origin server and the algorithms for generating responses to a request; and,
• It limits the reusability of responses for shared caching.

A user agent cannot rely on proactive negotiation preferences being consistently honored, since the origin server might not implement proactive negotiation for the requested resource or might decide that sending a response that doesn't conform to the user agent's preferences is better than sending a 406 (Not Acceptable) response. A Vary header field () is often sent in a response subject to proactive negotiation to indicate what parts of the request information were used in the selection algorithm. The following request header fields can be sent by a user agent to engage in proactive negotiation of the response content, as defined in . The preferences sent in these fields apply to any content in the response, including representations of the target resource, representations of error or processing status, and potentially even the miscellaneous text strings that might appear within the protocol.

Field Name	Ref.
Accept
Accept-Charset
Accept-Encoding
Accept-Language

For each of these header fields, a request that does not contain the field implies that the user agent has no preference on that axis of negotiation. If the header field is present in a request and none of the available representations for the response can be considered acceptable according to it, the origin server can either honor the header field by sending a 406 (Not Acceptable) response or disregard the header field by treating the response as if it is not subject to content negotiation for that request header field. This does not imply, however, that the client will be able to use the representation. Note: Sending these header fields makes it easier for a server to identify an individual by virtue of the user agent's request characteristics ().

The content negotiation fields defined by this specification use a common parameter, named "q" (case-insensitive), to assign a relative "weight" to the preference for that associated kind of content. This weight is referred to as a "quality value" (or "qvalue") because the same parameter name is often used within server configurations to assign a weight to the relative quality of the various representations that can be selected for a resource. The weight is normalized to a real number in the range 0 through 1, where 0.001 is the least preferred and 1 is the most preferred; a value of 0 means "not acceptable". If no "q" parameter is present, the default weight is 1. weight = OWS ";" OWS "q=" qvalue qvalue = ( "0" [ "." 0*3DIGIT ] ) / ( "1" [ "." 0*3("0") ] ) A sender of qvalue MUST NOT generate more than three digits after the decimal point. User configuration of these values ought to be limited in the same fashion.

Most of these header fields, where indicated, define a wildcard value ("*") to select unspecified values. If no wildcard is present, all values not explicitly mentioned in the field are considered "not acceptable" to the client. Note: In practice, using wildcards in content negotiation has limited practical value, because it is seldom useful to say, for example, "I prefer image/* more or less than (some other specific value)". Clients can explicitly request a 406 (Not Acceptable) response if a more preferred format is not available by sending Accept: */*;q=0, but they still need to be able to handle a different response, since the server is allowed to ignore their preference.

The "Accept" header field can be used by user agents to specify their preferences regarding response media types. For example, Accept header fields can be used to indicate that the request is specifically limited to a small set of desired types, as in the case of a request for an in-line image. When sent by a server in a response, Accept provides information about what content types are preferred in the payload of a subsequent request to the same resource. Accept = #( media-range [ accept-params ] ) media-range = ( "*/*" / ( type "/" "*" ) / ( type "/" subtype ) ) parameters accept-params = weight *( accept-ext ) accept-ext = OWS ";" OWS token [ "=" ( token / quoted-string ) ] The asterisk "*" character is used to group media types into ranges, with "*/*" indicating all media types and "type/*" indicating all subtypes of that type. The media-range can include media type parameters that are applicable to that range. Each media-range might be followed by zero or more applicable media type parameters (e.g., charset), an optional "q" parameter for indicating a relative weight (), and then zero or more extension parameters. The "q" parameter is necessary if any extensions (accept-ext) are present, since it acts as a separator between the two parameter sets. The example Accept: audio/*; q=0.2, audio/basic is interpreted as "I prefer audio/basic, but send me any audio type if it is the best available after an 80% markdown in quality". A more elaborate example is Accept: text/plain; q=0.5, text/html, text/x-dvi; q=0.8, text/x-c Verbally, this would be interpreted as "text/html and text/x-c are the equally preferred media types, but if they do not exist, then send the text/x-dvi representation, and if that does not exist, send the text/plain representation". Media ranges can be overridden by more specific media ranges or specific media types. If more than one media range applies to a given type, the most specific reference has precedence. For example, Accept: text/*, text/plain, text/plain;format=flowed, */* have the following precedence:

1. text/plain;format=flowed
2. text/plain
3. text/*
4. */*

The media type quality factor associated with a given type is determined by finding the media range with the highest precedence that matches the type. For example, Accept: text/*;q=0.3, text/plain;q=0.7, text/plain;format=flowed, text/plain;format=fixed;q=0.4, */*;q=0.5 would cause the following values to be associated:

Media Type	Quality Value
text/plain;format=flowed	1
text/plain	0.7
text/html	0.3
image/jpeg	0.5
text/plain;format=fixed	0.4
text/html;level=3	0.7

Note: A user agent might be provided with a default set of quality values for certain media ranges. However, unless the user agent is a closed system that cannot interact with other rendering agents, this default set ought to be configurable by the user.

deprecated The "Accept-Charset" header field can be sent by a user agent to indicate its preferences for charsets in textual response content. For example, this field allows user agents capable of understanding more comprehensive or special-purpose charsets to signal that capability to an origin server that is capable of representing information in those charsets. Accept-Charset = #( ( charset / "*" ) [ weight ] ) Charset names are defined in . A user agent MAY associate a quality value with each charset to indicate the user's relative preference for that charset, as defined in . An example is Accept-Charset: iso-8859-5, unicode-1-1;q=0.8 The special value "*", if present in the Accept-Charset field, matches every charset that is not mentioned elsewhere in the Accept-Charset field. Note: Accept-Charset is deprecated because UTF-8 has become nearly ubiquitous and sending a detailed list of user-preferred charsets wastes bandwidth, increases latency, and makes passive fingerprinting far too easy (). Most general-purpose user agents do not send Accept-Charset, unless specifically configured to do so.

The "Accept-Encoding" header field can be used to indicate preferences regarding the use of content codings (). When sent by a user agent in a request, Accept-Encoding indicates the content codings acceptable in a response. When sent by a server in a response, Accept-Encoding provides information about what content codings are preferred in the payload of a subsequent request to the same resource. An "identity" token is used as a synonym for "no encoding" in order to communicate when no encoding is preferred. Accept-Encoding = #( codings [ weight ] ) codings = content-coding / "identity" / "*" Each codings value MAY be given an associated quality value representing the preference for that encoding, as defined in . The asterisk "*" symbol in an Accept-Encoding field matches any available content-coding not explicitly listed in the header field. For example, Accept-Encoding: compress, gzip Accept-Encoding: Accept-Encoding: * Accept-Encoding: compress;q=0.5, gzip;q=1.0 Accept-Encoding: gzip;q=1.0, identity; q=0.5, *;q=0 A server tests whether a content-coding for a given representation is acceptable using these rules:

1. If no Accept-Encoding field is in the request, any content-coding is considered acceptable by the user agent.
2. If the representation has no content-coding, then it is acceptable by default unless specifically excluded by the Accept-Encoding field stating either "identity;q=0" or "*;q=0" without a more specific entry for "identity".
3. If the representation's content-coding is one of the content-codings listed in the Accept-Encoding field value, then it is acceptable unless it is accompanied by a qvalue of 0. (As defined in , a qvalue of 0 means "not acceptable".)
4. If multiple content-codings are acceptable, then the acceptable content-coding with the highest non-zero qvalue is preferred.

An Accept-Encoding header field with a field value that is empty implies that the user agent does not want any content-coding in response. If an Accept-Encoding header field is present in a request and none of the available representations for the response have a content-coding that is listed as acceptable, the origin server SHOULD send a response without any content-coding. When the Accept-Encoding header field is present in a response, it indicates what content codings the resource was willing to accept in the associated request. The field value is evaluated the same way as in a request. Note that this information is specific to the associated request; the set of supported encodings might be different for other resources on the same server and could change over time or depend on other aspects of the request (such as the request method). Servers that fail a request due to an unsupported content coding ought to respond with a 415 (Unsupported Media Type) status and include an Accept-Encoding header field in that response, allowing clients to distinguish between issues related to content codings and media types. In order to avoid confusion with issues related to media types, servers that fail a request with a 415 status for reasons unrelated to content codings MUST NOT include the Accept-Encoding header field. The most common use of Accept-Encoding is in responses with a 415 (Unsupported Media Type) status code, in response to optimistic use of a content coding by clients. However, the header field can also be used to indicate to clients that content codings are supported, to optimize future interactions. For example, a resource might include it in a 2xx (Successful) response when the request payload was big enough to justify use of a compression coding but the client failed do so.

The "Accept-Language" header field can be used by user agents to indicate the set of natural languages that are preferred in the response. Language tags are defined in . Accept-Language = #( language-range [ weight ] ) language-range = <language-range, see > Each language-range can be given an associated quality value representing an estimate of the user's preference for the languages specified by that range, as defined in . For example, Accept-Language: da, en-gb;q=0.8, en;q=0.7 would mean: "I prefer Danish, but will accept British English and other types of English". Note that some recipients treat the order in which language tags are listed as an indication of descending priority, particularly for tags that are assigned equal quality values (no value is the same as q=1). However, this behavior cannot be relied upon. For consistency and to maximize interoperability, many user agents assign each language tag a unique quality value while also listing them in order of decreasing quality. Additional discussion of language priority lists can be found in . For matching, defines several matching schemes. Implementations can offer the most appropriate matching scheme for their requirements. The "Basic Filtering" scheme () is identical to the matching scheme that was previously defined for HTTP in . It might be contrary to the privacy expectations of the user to send an Accept-Language header field with the complete linguistic preferences of the user in every request (). Since intelligibility is highly dependent on the individual user, user agents need to allow user control over the linguistic preference (either through configuration of the user agent itself or by defaulting to a user controllable system setting). A user agent that does not provide such control to the user MUST NOT send an Accept-Language header field.

With reactive negotiation (a.k.a., agent-driven negotiation), selection of the best response representation (regardless of the status code) is performed by the user agent after receiving an initial response from the origin server that contains a list of resources for alternative representations. If the user agent is not satisfied by the initial response representation, it can perform a GET request on one or more of the alternative resources, selected based on metadata included in the list, to obtain a different form of representation for that response. Selection of alternatives might be performed automatically by the user agent or manually by the user selecting from a generated (possibly hypertext) menu. Note that the above refers to representations of the response, in general, not representations of the resource. The alternative representations are only considered representations of the target resource if the response in which those alternatives are provided has the semantics of being a representation of the target resource (e.g., a 200 (OK) response to a GET request) or has the semantics of providing links to alternative representations for the target resource (e.g., a 300 (Multiple Choices) response to a GET request). A server might choose not to send an initial representation, other than the list of alternatives, and thereby indicate that reactive negotiation by the user agent is preferred. For example, the alternatives listed in responses with the 300 (Multiple Choices) and 406 (Not Acceptable) status codes include information about the available representations so that the user or user agent can react by making a selection. Reactive negotiation is advantageous when the response would vary over commonly used dimensions (such as type, language, or encoding), when the origin server is unable to determine a user agent's capabilities from examining the request, and generally when public caches are used to distribute server load and reduce network usage. Reactive negotiation suffers from the disadvantages of transmitting a list of alternatives to the user agent, which degrades user-perceived latency if transmitted in the header section, and needing a second request to obtain an alternate representation. Furthermore, this specification does not define a mechanism for supporting automatic selection, though it does not prevent such a mechanism from being developed as an extension.

The "Vary" header field in a response describes what parts of a request message, aside from the method and target URI, might influence the origin server's process for selecting and representing this response. Vary = #( "*" / field-name ) A Vary field value is a list of request field names, known as the selecting header fields, that might have a role in selecting the representation for this response. Potential selecting header fields are not limited to those defined by this specification. If the list contains "*", it signals that other aspects of the request might play a role in selecting the response representation, possibly including elements outside the message syntax (e.g., the client's network address). A recipient will not be able to determine whether this response is appropriate for a later request without forwarding the request to the origin server. A proxy MUST NOT generate "*" in a Vary field value. For example, a response that contains Vary: accept-encoding, accept-language indicates that the origin server might have used the request's Accept-Encoding and Accept-Language fields (or lack thereof) as determining factors while choosing the content for this response. An origin server might send Vary with a list of fields for two purposes:

1. To inform cache recipients that they MUST NOT use this response to satisfy a later request unless the later request has the same values for the listed fields as the original request (). In other words, Vary expands the cache key required to match a new request to the stored cache entry.
2. To inform user agent recipients that this response is subject to content negotiation () and that a different representation might be sent in a subsequent request if additional parameters are provided in the listed header fields (proactive negotiation).

An origin server SHOULD send a Vary header field when its algorithm for selecting a representation varies based on aspects of the request message other than the method and target URI, unless the variance cannot be crossed or the origin server has been deliberately configured to prevent cache transparency. For example, there is no need to send the Authorization field name in Vary because reuse across users is constrained by the field definition (). Likewise, an origin server might use Cache-Control response directives () to supplant Vary if it considers the variance less significant than the performance cost of Vary's impact on caching.

When content negotiation preferences are sent in a server's response, the listed preferences are called request payload negotiation because they intend to influence selection of an appropriate payload for subsequent requests to that resource. For example, the Accept-Encoding field () can be sent in a response to indicate preferred content codings for subsequent requests to that resource .

A conditional request is an HTTP request with one or more request header fields that indicate a precondition to be tested before applying the request method to the target resource. defines when preconditions are applied. defines the order of evaluation when more than one precondition is present. Conditional GET requests are the most efficient mechanism for HTTP cache updates . Conditionals can also be applied to state-changing methods, such as PUT and DELETE, to prevent the "lost update" problem: one client accidentally overwriting the work of another client that has been acting in parallel. Conditional request preconditions are based on the state of the target resource as a whole (its current value set) or the state as observed in a previously obtained representation (one value in that set). A resource might have multiple current representations, each with its own observable state. The conditional request mechanisms assume that the mapping of requests to a selected representation () will be consistent over time if the server intends to take advantage of conditionals. Regardless, if the mapping is inconsistent and the server is unable to select the appropriate representation, then no harm will result when the precondition evaluates to false.

The following request header fields allow a client to place a precondition on the state of the target resource, so that the action corresponding to the method semantics will not be applied if the precondition evaluates to false. Each precondition defined by this specification consists of a comparison between a set of validators obtained from prior representations of the target resource to the current state of validators for the selected representation (). Hence, these preconditions evaluate whether the state of the target resource has changed since a given state known by the client. The effect of such an evaluation depends on the method semantics and choice of conditional, as defined in .

Field Name	Ref.
If-Match
If-None-Match
If-Modified-Since
If-Unmodified-Since
If-Range

The "If-Match" header field makes the request method conditional on the recipient origin server either having at least one current representation of the target resource, when the field value is "*", or having a current representation of the target resource that has an entity-tag matching a member of the list of entity-tags provided in the field value. An origin server MUST use the strong comparison function when comparing entity-tags for If-Match (), since the client intends this precondition to prevent the method from being applied if there have been any changes to the representation data. If-Match = "*" / #entity-tag Examples: If-Match: "xyzzy" If-Match: "xyzzy", "r2d2xxxx", "c3piozzzz" If-Match: * If-Match is most often used with state-changing methods (e.g., POST, PUT, DELETE) to prevent accidental overwrites when multiple user agents might be acting in parallel on the same resource (i.e., to prevent the "lost update" problem). It can also be used with any method to abort a request if the selected representation does not match one that the client has already stored (or partially stored) from a prior request. An origin server that receives an If-Match header field MUST evaluate the condition as per prior to performing the method. To evaluate a received If-Match header field:

1. If the field value is "*", the condition is true if the origin server has a current representation for the target resource.
2. If the field value is a list of entity-tags, the condition is true if any of the listed tags match the entity-tag of the selected representation.
3. Otherwise, the condition is false.

An origin server MUST NOT perform the requested method if a received If-Match condition evaluates to false. Instead, the origin server MAY indicate that the conditional request failed by responding with a 412 (Precondition Failed) status code. Alternatively, if the request is a state-changing operation that appears to have already been applied to the selected representation, the origin server MAY respond with a 2xx (Successful) status code (i.e., the change requested by the user agent has already succeeded, but the user agent might not be aware of it, perhaps because the prior response was lost or an equivalent change was made by some other user agent). Allowing an origin server to send a success response when a change request appears to have already been applied is more efficient for many authoring use cases, but comes with some risk if multiple user agents are making change requests that are very similar but not cooperative. For example, multiple user agents writing to a common resource as a semaphore (e.g., a non-atomic increment) are likely to collide and potentially lose important state transitions. For those kinds of resources, an origin server is better off being stringent in sending 412 for every failed precondition on an unsafe method. In other cases, excluding the ETag field from a success response might encourage the user agent to perform a GET as its next request to eliminate confusion about the resource's current state. The If-Match header field can be ignored by caches and intermediaries because it is not applicable to a stored response. Note that an If-Match header field with a list value containing "*" and other values (including other instances of "*") is unlikely to be interoperable.

The "If-None-Match" header field makes the request method conditional on a recipient cache or origin server either not having any current representation of the target resource, when the field value is "*", or having a selected representation with an entity-tag that does not match any of those listed in the field value. A recipient MUST use the weak comparison function when comparing entity-tags for If-None-Match (), since weak entity-tags can be used for cache validation even if there have been changes to the representation data. If-None-Match = "*" / #entity-tag Examples: If-None-Match: "xyzzy" If-None-Match: W/"xyzzy" If-None-Match: "xyzzy", "r2d2xxxx", "c3piozzzz" If-None-Match: W/"xyzzy", W/"r2d2xxxx", W/"c3piozzzz" If-None-Match: * If-None-Match is primarily used in conditional GET requests to enable efficient updates of cached information with a minimum amount of transaction overhead. When a client desires to update one or more stored responses that have entity-tags, the client SHOULD generate an If-None-Match header field containing a list of those entity-tags when making a GET request; this allows recipient servers to send a 304 (Not Modified) response to indicate when one of those stored responses matches the selected representation. If-None-Match can also be used with a value of "*" to prevent an unsafe request method (e.g., PUT) from inadvertently modifying an existing representation of the target resource when the client believes that the resource does not have a current representation (). This is a variation on the "lost update" problem that might arise if more than one client attempts to create an initial representation for the target resource. An origin server that receives an If-None-Match header field MUST evaluate the condition as per prior to performing the method. To evaluate a received If-None-Match header field:

1. If the field value is "*", the condition is false if the origin server has a current representation for the target resource.
2. If the field value is a list of entity-tags, the condition is false if one of the listed tags matches the entity-tag of the selected representation.
3. Otherwise, the condition is true.

An origin server MUST NOT perform the requested method if the condition evaluates to false; instead, the origin server MUST respond with either a) the 304 (Not Modified) status code if the request method is GET or HEAD or b) the 412 (Precondition Failed) status code for all other request methods. Requirements on cache handling of a received If-None-Match header field are defined in . Note that an If-None-Match header field with a list value containing "*" and other values (including other instances of "*") is unlikely to be interoperable.

The "If-Modified-Since" header field makes a GET or HEAD request method conditional on the selected representation's modification date being more recent than the date provided in the field value. Transfer of the selected representation's data is avoided if that data has not changed. If-Modified-Since = HTTP-date An example of the field is: If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT A recipient MUST ignore If-Modified-Since if the request contains an If-None-Match header field; the condition in If-None-Match is considered to be a more accurate replacement for the condition in If-Modified-Since, and the two are only combined for the sake of interoperating with older intermediaries that might not implement If-None-Match. A recipient MUST ignore the If-Modified-Since header field if the received field value is not a valid HTTP-date, the field value has more than one member, or if the request method is neither GET nor HEAD. A recipient MUST interpret an If-Modified-Since field value's timestamp in terms of the origin server's clock. If-Modified-Since is typically used for two distinct purposes: 1) to allow efficient updates of a cached representation that does not have an entity-tag and 2) to limit the scope of a web traversal to resources that have recently changed. When used for cache updates, a cache will typically use the value of the cached message's Last-Modified field to generate the field value of If-Modified-Since. This behavior is most interoperable for cases where clocks are poorly synchronized or when the server has chosen to only honor exact timestamp matches (due to a problem with Last-Modified dates that appear to go "back in time" when the origin server's clock is corrected or a representation is restored from an archived backup). However, caches occasionally generate the field value based on other data, such as the Date header field of the cached message or the local clock time that the message was received, particularly when the cached message does not contain a Last-Modified field. When used for limiting the scope of retrieval to a recent time window, a user agent will generate an If-Modified-Since field value based on either its own local clock or a Date header field received from the server in a prior response. Origin servers that choose an exact timestamp match based on the selected representation's Last-Modified field will not be able to help the user agent limit its data transfers to only those changed during the specified window. An origin server that receives an If-Modified-Since header field SHOULD evaluate the condition as per prior to performing the method. The origin server SHOULD NOT perform the requested method if the selected representation's last modification date is earlier than or equal to the date provided in the field value; instead, the origin server SHOULD generate a 304 (Not Modified) response, including only those metadata that are useful for identifying or updating a previously cached response. Requirements on cache handling of a received If-Modified-Since header field are defined in .

The "If-Unmodified-Since" header field makes the request method conditional on the selected representation's last modification date being earlier than or equal to the date provided in the field value. This field accomplishes the same purpose as If-Match for cases where the user agent does not have an entity-tag for the representation. If-Unmodified-Since = HTTP-date An example of the field is: If-Unmodified-Since: Sat, 29 Oct 1994 19:43:31 GMT A recipient MUST ignore If-Unmodified-Since if the request contains an If-Match header field; the condition in If-Match is considered to be a more accurate replacement for the condition in If-Unmodified-Since, and the two are only combined for the sake of interoperating with older intermediaries that might not implement If-Match. A recipient MUST ignore the If-Unmodified-Since header field if the received field value is not a valid HTTP-date (including when the field value appears to be a list of dates). A recipient MUST interpret an If-Unmodified-Since field value's timestamp in terms of the origin server's clock. If-Unmodified-Since is most often used with state-changing methods (e.g., POST, PUT, DELETE) to prevent accidental overwrites when multiple user agents might be acting in parallel on a resource that does not supply entity-tags with its representations (i.e., to prevent the "lost update" problem). It can also be used with any method to abort a request if the selected representation does not match one that the client already stored (or partially stored) from a prior request. An origin server that receives an If-Unmodified-Since header field MUST evaluate the condition as per prior to performing the method. If the selected representation has a last modification date, the origin server MUST NOT perform the requested method if that date is more recent than the date provided in the field value. Instead, the origin server MAY indicate that the conditional request failed by responding with a 412 (Precondition Failed) status code. Alternatively, if the request is a state-changing operation that appears to have already been applied to the selected representation, the origin server MAY respond with a 2xx (Successful) status code (i.e., the change requested by the user agent has already succeeded, but the user agent might not be aware of it, perhaps because the prior response was lost or an equivalent change was made by some other user agent). Allowing an origin server to send a success response when a change request appears to have already been applied is more efficient for many authoring use cases, but comes with some risk if multiple user agents are making change requests that are very similar but not cooperative. In those cases, an origin server is better off being stringent in sending 412 for every failed precondition on an unsafe method. The If-Unmodified-Since header field can be ignored by caches and intermediaries because it is not applicable to a stored response.

The "If-Range" header field provides a special conditional request mechanism that is similar to the If-Match and If-Unmodified-Since header fields but that instructs the recipient to ignore the Range header field if the validator doesn't match, resulting in transfer of the new selected representation instead of a 412 (Precondition Failed) response. If a client has a partial copy of a representation and wishes to have an up-to-date copy of the entire representation, it could use the Range header field with a conditional GET (using either or both of If-Unmodified-Since and If-Match.) However, if the precondition fails because the representation has been modified, the client would then have to make a second request to obtain the entire current representation. The "If-Range" header field allows a client to "short-circuit" the second request. Informally, its meaning is as follows: if the representation is unchanged, send me the part(s) that I am requesting in Range; otherwise, send me the entire representation. If-Range = entity-tag / HTTP-date A client MUST NOT generate an If-Range header field in a request that does not contain a Range header field. A server MUST ignore an If-Range header field received in a request that does not contain a Range header field. An origin server MUST ignore an If-Range header field received in a request for a target resource that does not support Range requests. A client MUST NOT generate an If-Range header field containing an entity-tag that is marked as weak. A client MUST NOT generate an If-Range header field containing an HTTP-date unless the client has no entity-tag for the corresponding representation and the date is a strong validator in the sense defined by . A server that evaluates an If-Range precondition MUST use the strong comparison function when comparing entity-tags () and MUST evaluate the condition as false if an HTTP-date validator is provided that is not a strong validator in the sense defined by . A valid entity-tag can be distinguished from a valid HTTP-date by examining the first two characters for a DQUOTE. If the validator given in the If-Range header field matches the current validator for the selected representation of the target resource, then the server SHOULD process the Range header field as requested. If the validator does not match, the server MUST ignore the Range header field. Note that this comparison by exact match, including when the validator is an HTTP-date, differs from the "earlier than or equal to" comparison used when evaluating an If-Unmodified-Since conditional.

Except when excluded below, a recipient cache or origin server MUST evaluate received request preconditions after it has successfully performed its normal request checks and just before it would process the request body (if any) or perform the action associated with the request method. A server MUST ignore all received preconditions if its response to the same request without those conditions, prior to processing the request body, would have been a status code other than a 2xx (Successful) or 412 (Precondition Failed). In other words, redirects and failures that can be detected before significant processing occurs take precedence over the evaluation of preconditions. A server that is not the origin server for the target resource and cannot act as a cache for requests on the target resource MUST NOT evaluate the conditional request header fields defined by this specification, and it MUST forward them if the request is forwarded, since the generating client intends that they be evaluated by a server that can provide a current representation. Likewise, a server MUST ignore the conditional request header fields defined by this specification when received with a request method that does not involve the selection or modification of a selected representation, such as CONNECT, OPTIONS, or TRACE. Note that protocol extensions can modify the conditions under which revalidation is triggered. For example, the "immutable" cache directive (defined by ) instructs caches to forgo revalidation of fresh responses even when requested by the client. Conditional request header fields that are defined by extensions to HTTP might place conditions on all recipients, on the state of the target resource in general, or on a group of resources. For instance, the "If" header field in WebDAV can make a request conditional on various aspects of multiple resources, such as locks, if the recipient understands and implements that field (). Although conditional request header fields are defined as being usable with the HEAD method (to keep HEAD's semantics consistent with those of GET), there is no point in sending a conditional HEAD because a successful response is around the same size as a 304 (Not Modified) response and more useful than a 412 (Precondition Failed) response.

When more than one conditional request header field is present in a request, the order in which the fields are evaluated becomes important. In practice, the fields defined in this document are consistently implemented in a single, logical order, since "lost update" preconditions have more strict requirements than cache validation, a validated cache is more efficient than a partial response, and entity tags are presumed to be more accurate than date validators. A recipient cache or origin server MUST evaluate the request preconditions defined by this specification in the following order:

1. When recipient is the origin server and If-Match is present, evaluate the If-Match precondition:
   • if true, continue to step
   • if false, respond 412 (Precondition Failed) unless it can be determined that the state-changing request has already succeeded (see )
2. When recipient is the origin server, If-Match is not present, and If-Unmodified-Since is present, evaluate the If-Unmodified-Since precondition:
   • if true, continue to step
   • if false, respond 412 (Precondition Failed) unless it can be determined that the state-changing request has already succeeded (see )
3. When If-None-Match is present, evaluate the If-None-Match precondition:
   • if true, continue to step
   • if false for GET/HEAD, respond 304 (Not Modified)
   • if false for other methods, respond 412 (Precondition Failed)
4. When the method is GET or HEAD, If-None-Match is not present, and If-Modified-Since is present, evaluate the If-Modified-Since precondition:
   • if true, continue to step
   • if false, respond 304 (Not Modified)
5. When the method is GET and both Range and If-Range are present, evaluate the If-Range precondition:
   • if the validator matches and the Range specification is applicable to the selected representation, respond 206 (Partial Content)
6. Otherwise,
   • all conditions are met, so perform the requested action and respond according to its success or failure.

Any extension to HTTP that defines additional conditional request header fields ought to define its own expectations regarding the order for evaluating such fields in relation to those defined in this document and other conditionals that might be found in practice.

Clients often encounter interrupted data transfers as a result of canceled requests or dropped connections. When a client has stored a partial representation, it is desirable to request the remainder of that representation in a subsequent request rather than transfer the entire representation. Likewise, devices with limited local storage might benefit from being able to request only a subset of a larger representation, such as a single page of a very large document, or the dimensions of an embedded image. Range requests are an OPTIONAL feature of HTTP, designed so that recipients not implementing this feature (or not supporting it for the target resource) can respond as if it is a normal GET request without impacting interoperability. Partial responses are indicated by a distinct status code to not be mistaken for full responses by caches that might not implement the feature.

Representation data can be partitioned into subranges when there are addressable structural units inherent to that data's content coding or media type. For example, octet (a.k.a., byte) boundaries are a structural unit common to all representation data, allowing partitions of the data to be identified as a range of bytes at some offset from the start or end of that data. This general notion of a "range unit" is used in the Accept-Ranges () response header field to advertise support for range requests, the Range () request header field to delineate the parts of a representation that are requested, and the Content-Range () payload header field to describe which part of a representation is being transferred. range-unit = token All range unit names are case-insensitive and ought to be registered within the "HTTP Range Unit Registry", as defined in Range units are intended to be extensible, as described in . The following range unit names are defined by this document:

Range Unit Name	Description	Ref.
bytes	a range of octets
none	reserved as keyword to indicate range requests are not supported

Ranges are expressed in terms of a range unit paired with a set of range specifiers. The range unit name determines what kinds of range-spec are applicable to its own specifiers. Hence, the following gramar is generic: each range unit is expected to specify requirements on when int-range, suffix-range, and other-range are allowed. A range request can specify a single range or a set of ranges within a single representation. ranges-specifier = range-unit "=" range-set range-set = 1#range-spec range-spec = int-range / suffix-range / other-range An int-range is a range expressed as two non-negative integers or as one non-negative integer through to the end of the representation data. The range unit specifies what the integers mean (e.g., they might indicate unit offsets from the beginning, inclusive numbered parts, etc.). int-range = first-pos "-" [ last-pos ] first-pos = 1*DIGIT last-pos = 1*DIGIT An int-range is invalid if the last-pos value is present and less than the first-pos. A suffix-range is a range expressed as a suffix of the representation data with the provided non-negative integer maximum length (in range units). In other words, the last N units of the representation data. suffix-range = "-" suffix-length suffix-length = 1*DIGIT To provide for extensibility, the other-range rule is a mostly unconstrained grammar that allows application-specific or future range units to define additional range specifiers. other-range = 1*( %x21-2B / %x2D-7E ) ; 1*(VCHAR excluding comma)

The "bytes" range unit is used to express subranges of a representation data's octet sequence. Each byte range is expressed as an integer range at some offset, relative to either the beginning (int-range) or end (suffix-range) of the representation data. Byte ranges do not use the other-range specifier. The first-pos value in a bytes int-range gives the offset of the first byte in a range. The last-pos value gives the offset of the last byte in the range; that is, the byte positions specified are inclusive. Byte offsets start at zero. If the representation data has a content coding applied, each byte range is calculated with respect to the encoded sequence of bytes, not the sequence of underlying bytes that would be obtained after decoding. Examples of bytes range specifiers:

• The first 500 bytes (byte offsets 0-499, inclusive): bytes=0-499
• The second 500 bytes (byte offsets 500-999, inclusive): bytes=500-999

A client can limit the number of bytes requested without knowing the size of the selected representation. If the last-pos value is absent, or if the value is greater than or equal to the current length of the representation data, the byte range is interpreted as the remainder of the representation (i.e., the server replaces the value of last-pos with a value that is one less than the current length of the selected representation). A client can request the last N bytes (N > 0) of the selected representation using a suffix-range. If the selected representation is shorter than the specified suffix-length, the entire representation is used. Additional examples, assuming a representation of length 10000:

• The final 500 bytes (byte offsets 9500-9999, inclusive): bytes=-500 Or: bytes=9500-
• The first and last bytes only (bytes 0 and 9999): bytes=0-0,-1
• The first, middle, and last 1000 bytes: bytes= 0-999, 4500-5499, -1000
• Other valid (but not canonical) specifications of the second 500 bytes (byte offsets 500-999, inclusive): bytes=500-600,601-999 bytes=500-700,601-999

If a valid bytes range-set includes at least one range-spec with a first-pos that is less than the current length of the representation, or at least one suffix-range with a non-zero suffix-length, then the bytes range-set is satisfiable. Otherwise, the bytes range-set is unsatisfiable. If the selected representation has zero length, the only satisfiable form of range-spec is a suffix-range with a non-zero suffix-length. In the byte-range syntax, first-pos, last-pos, and suffix-length are expressed as decimal number of octets. Since there is no predefined limit to the length of a payload, recipients MUST anticipate potentially large decimal numerals and prevent parsing errors due to integer conversion overflows.

The "Range" header field on a GET request modifies the method semantics to request transfer of only one or more subranges of the selected representation data (), rather than the entire selected representation. Range = ranges-specifier A server MAY ignore the Range header field. However, origin servers and intermediate caches ought to support byte ranges when possible, since they support efficient recovery from partially failed transfers and partial retrieval of large representations. A server MUST ignore a Range header field received with a request method other than GET. An origin server MUST ignore a Range header field that contains a range unit it does not understand. A proxy MAY discard a Range header field that contains a range unit it does not understand. A server that supports range requests MAY ignore or reject a Range header field that consists of more than two overlapping ranges, or a set of many small ranges that are not listed in ascending order, since both are indications of either a broken client or a deliberate denial-of-service attack (). A client SHOULD NOT request multiple ranges that are inherently less efficient to process and transfer than a single range that encompasses the same data. A server that supports range requests MAY ignore a Range header field when the selected representation has no body (i.e., the selected representation data is of zero length). A client that is requesting multiple ranges SHOULD list those ranges in ascending order (the order in which they would typically be received in a complete representation) unless there is a specific need to request a later part earlier. For example, a user agent processing a large representation with an internal catalog of parts might need to request later parts first, particularly if the representation consists of pages stored in reverse order and the user agent wishes to transfer one page at a time. The Range header field is evaluated after evaluating the precondition header fields defined in , and only if the result in absence of the Range header field would be a 200 (OK) response. In other words, Range is ignored when a conditional GET would result in a 304 (Not Modified) response. The If-Range header field () can be used as a precondition to applying the Range header field. If all of the preconditions are true, the server supports the Range header field for the target resource, and the specified range(s) are valid and satisfiable (as defined in ), the server SHOULD send a 206 (Partial Content) response with a payload containing one or more partial representations that correspond to the satisfiable ranges requested. If all of the preconditions are true, the server supports the Range header field for the target resource, and the specified range(s) are invalid or unsatisfiable, the server SHOULD send a 416 (Range Not Satisfiable) response.

The "Accept-Ranges" header field allows a server to indicate that it supports range requests for the target resource. Accept-Ranges = acceptable-ranges acceptable-ranges = 1#range-unit / "none" An origin server that supports byte-range requests for a given target resource MAY send Accept-Ranges: bytes to indicate what range units are supported. A client MAY generate range requests without having received this header field for the resource involved. Range units are defined in . A server that does not support any kind of range request for the target resource MAY send Accept-Ranges: none to advise the client not to attempt a range request.

The "Content-Range" header field is sent in a single part 206 (Partial Content) response to indicate the partial range of the selected representation enclosed as the message payload, sent in each part of a multipart 206 response to indicate the range enclosed within each body part, and sent in 416 (Range Not Satisfiable) responses to provide information about the selected representation. Content-Range = range-unit SP ( range-resp / unsatisfied-range ) range-resp = incl-range "/" ( complete-length / "*" ) incl-range = first-pos "-" last-pos unsatisfied-range = "*/" complete-length complete-length = 1*DIGIT If a 206 (Partial Content) response contains a Content-Range header field with a range unit () that the recipient does not understand, the recipient MUST NOT attempt to recombine it with a stored representation. A proxy that receives such a message SHOULD forward it downstream. For byte ranges, a sender SHOULD indicate the complete length of the representation from which the range has been extracted, unless the complete length is unknown or difficult to determine. An asterisk character ("*") in place of the complete-length indicates that the representation length was unknown when the header field was generated. The following example illustrates when the complete length of the selected representation is known by the sender to be 1234 bytes: Content-Range: bytes 42-1233/1234 and this second example illustrates when the complete length is unknown: Content-Range: bytes 42-1233/* A Content-Range field value is invalid if it contains a range-resp that has a last-pos value less than its first-pos value, or a complete-length value less than or equal to its last-pos value. The recipient of an invalid Content-Range MUST NOT attempt to recombine the received content with a stored representation. A server generating a 416 (Range Not Satisfiable) response to a byte-range request SHOULD send a Content-Range header field with an unsatisfied-range value, as in the following example: Content-Range: bytes */1234 The complete-length in a 416 response indicates the current length of the selected representation. The Content-Range header field has no meaning for status codes that do not explicitly describe its semantic. For this specification, only the 206 (Partial Content) and 416 (Range Not Satisfiable) status codes describe a meaning for Content-Range. The following are examples of Content-Range values in which the selected representation contains a total of 1234 bytes:

• The first 500 bytes: Content-Range: bytes 0-499/1234
• The second 500 bytes: Content-Range: bytes 500-999/1234
• All except for the first 500 bytes: Content-Range: bytes 500-1233/1234
• The last 500 bytes: Content-Range: bytes 734-1233/1234

When a 206 (Partial Content) response message includes the content of multiple ranges, they are transmitted as body parts in a multipart message body () with the media type of "multipart/byteranges". The multipart/byteranges media type includes one or more body parts, each with its own Content-Type and Content-Range fields. The required boundary parameter specifies the boundary string used to separate each body part. Implementation Notes:

1. Additional CRLFs might precede the first boundary string in the body.
2. Although permits the boundary string to be quoted, some existing implementations handle a quoted boundary string incorrectly.
3. A number of clients and servers were coded to an early draft of the byteranges specification that used a media type of multipart/x-byteranges, which is almost (but not quite) compatible with this type.

Despite the name, the "multipart/byteranges" media type is not limited to byte ranges. The following example uses an "exampleunit" range unit: HTTP/1.1 206 Partial Content Date: Tue, 14 Nov 1995 06:25:24 GMT Last-Modified: Tue, 14 July 04:58:08 GMT Content-Length: 2331785 Content-Type: multipart/byteranges; boundary=THIS_STRING_SEPARATES --THIS_STRING_SEPARATES Content-Type: video/example Content-Range: exampleunit 1.2-4.3/25 ...the first range... --THIS_STRING_SEPARATES Content-Type: video/example Content-Range: exampleunit 11.2-14.3/25 ...the second range --THIS_STRING_SEPARATES-- The following information serves as the registration form for the multipart/byteranges media type.

Type name:

multipart

Subtype name:

byteranges

Required parameters:

boundary

Optional parameters:

N/A

Encoding considerations:

only "7bit", "8bit", or "binary" are permitted

Security considerations:

see

Interoperability considerations:

N/A

Published specification:

This specification (see ).

Applications that use this media type:

HTTP components supporting multiple ranges in a single request.

Fragment identifier considerations:

N/A

Additional information:

Deprecated alias names for this type:

N/A

Magic number(s):

N/A

File extension(s):

N/A

Macintosh file type code(s):

N/A

Person and email address to contact for further information:

See Authors' Addresses section.

Intended usage:

COMMON

Restrictions on usage:

N/A

Author:

See Authors' Addresses section.

Change controller:

IESG

The (response) status code is a three-digit integer code giving the result of the attempt to understand and satisfy the request. HTTP status codes are extensible. HTTP clients are not required to understand the meaning of all registered status codes, though such understanding is obviously desirable. However, a client MUST understand the class of any status code, as indicated by the first digit, and treat an unrecognized status code as being equivalent to the x00 status code of that class. For example, if an unrecognized status code of 471 is received by a client, the client can assume that there was something wrong with its request and treat the response as if it had received a 400 (Bad Request) status code. The response message will usually contain a representation that explains the status. The first digit of the status code defines the class of response. The last two digits do not have any categorization role. There are five values for the first digit:

• 1xx (Informational): The request was received, continuing process
• 2xx (Successful): The request was successfully received, understood, and accepted
• 3xx (Redirection): Further action needs to be taken in order to complete the request
• 4xx (Client Error): The request contains bad syntax or cannot be fulfilled
• 5xx (Server Error): The server failed to fulfill an apparently valid request

A single request can have multiple associated responses: zero or more interim (non-final) responses with status codes in the "informational" (1xx) range, followed by exactly one final response with a status code in one of the other ranges.

The status codes listed below are defined in this specification. The reason phrases listed here are only recommendations — they can be replaced by local equivalents without affecting the protocol. Responses with status codes that are defined as heuristically cacheable (e.g., 200, 203, 204, 206, 300, 301, 308, 404, 405, 410, 414, and 501 in this specification) can be reused by a cache with heuristic expiration unless otherwise indicated by the method definition or explicit cache controls ; all other status codes are not heuristically cacheable. Additional status codes, outside the scope of this specification, have been specified for use in HTTP. All such status codes ought to be registered within the "Hypertext Transfer Protocol (HTTP) Status Code Registry", as described in .

The 1xx (Informational) class of status code indicates an interim response for communicating connection status or request progress prior to completing the requested action and sending a final response. 1xx responses are terminated by the end of the header section. Since HTTP/1.0 did not define any 1xx status codes, a server MUST NOT send a 1xx response to an HTTP/1.0 client. A client MUST be able to parse one or more 1xx responses received prior to a final response, even if the client does not expect one. A user agent MAY ignore unexpected 1xx responses. A proxy MUST forward 1xx responses unless the proxy itself requested the generation of the 1xx response. For example, if a proxy adds an "Expect: 100-continue" field when it forwards a request, then it need not forward the corresponding 100 (Continue) response(s).

The 100 (Continue) status code indicates that the initial part of a request has been received and has not yet been rejected by the server. The server intends to send a final response after the request has been fully received and acted upon. When the request contains an Expect header field that includes a 100-continue expectation, the 100 response indicates that the server wishes to receive the request payload body, as described in . The client ought to continue sending the request and discard the 100 response. If the request did not contain an Expect header field containing the 100-continue expectation, the client can simply discard this interim response.

The 101 (Switching Protocols) status code indicates that the server understands and is willing to comply with the client's request, via the Upgrade header field (), for a change in the application protocol being used on this connection. The server MUST generate an Upgrade header field in the response that indicates which protocol(s) will be switched to immediately after the empty line that terminates the 101 response. It is assumed that the server will only agree to switch protocols when it is advantageous to do so. For example, switching to a newer version of HTTP might be advantageous over older versions, and switching to a real-time, synchronous protocol might be advantageous when delivering resources that use such features.

The 2xx (Successful) class of status code indicates that the client's request was successfully received, understood, and accepted.

The 200 (OK) status code indicates that the request has succeeded. The payload sent in a 200 response depends on the request method. For the methods defined by this specification, the intended meaning of the payload can be summarized as:

GET

a representation of the target resource;

HEAD

the same representation as GET, but without the representation data;

POST

a representation of the status of, or results obtained from, the action;

PUT, DELETE

a representation of the status of the action;

OPTIONS

a representation of the communications options;

TRACE

a representation of the request message as received by the end server.

Aside from responses to CONNECT, a 200 response always has a payload, though an origin server MAY generate a payload body of zero length. If no payload is desired, an origin server ought to send 204 (No Content) instead. For CONNECT, no payload is allowed because the successful result is a tunnel, which begins immediately after the 200 response header section. A 200 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see ).

The 201 (Created) status code indicates that the request has been fulfilled and has resulted in one or more new resources being created. The primary resource created by the request is identified by either a Location header field in the response or, if no Location field is received, by the target URI. The 201 response payload typically describes and links to the resource(s) created. See for a discussion of the meaning and purpose of validator header fields, such as ETag and Last-Modified, in a 201 response.

The 202 (Accepted) status code indicates that the request has been accepted for processing, but the processing has not been completed. The request might or might not eventually be acted upon, as it might be disallowed when processing actually takes place. There is no facility in HTTP for re-sending a status code from an asynchronous operation. The 202 response is intentionally noncommittal. Its purpose is to allow a server to accept a request for some other process (perhaps a batch-oriented process that is only run once per day) without requiring that the user agent's connection to the server persist until the process is completed. The representation sent with this response ought to describe the request's current status and point to (or embed) a status monitor that can provide the user with an estimate of when the request will be fulfilled.

The 203 (Non-Authoritative Information) status code indicates that the request was successful but the enclosed payload has been modified from that of the origin server's 200 (OK) response by a transforming proxy (). This status code allows the proxy to notify recipients when a transformation has been applied, since that knowledge might impact later decisions regarding the content. For example, future cache validation requests for the content might only be applicable along the same request path (through the same proxies). The 203 response is similar to the Warning code of 214 Transformation Applied (), which has the advantage of being applicable to responses with any status code. A 203 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see ).

The 204 (No Content) status code indicates that the server has successfully fulfilled the request and that there is no additional content to send in the response payload body. Metadata in the response header fields refer to the target resource and its selected representation after the requested action was applied. For example, if a 204 status code is received in response to a PUT request and the response contains an ETag field, then the PUT was successful and the ETag field value contains the entity-tag for the new representation of that target resource. The 204 response allows a server to indicate that the action has been successfully applied to the target resource, while implying that the user agent does not need to traverse away from its current "document view" (if any). The server assumes that the user agent will provide some indication of the success to its user, in accord with its own interface, and apply any new or updated metadata in the response to its active representation. For example, a 204 status code is commonly used with document editing interfaces corresponding to a "save" action, such that the document being saved remains available to the user for editing. It is also frequently used with interfaces that expect automated data transfers to be prevalent, such as within distributed version control systems. A 204 response is terminated by the first empty line after the header fields because it cannot contain a message body. A 204 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see ).

The 205 (Reset Content) status code indicates that the server has fulfilled the request and desires that the user agent reset the "document view", which caused the request to be sent, to its original state as received from the origin server. This response is intended to support a common data entry use case where the user receives content that supports data entry (a form, notepad, canvas, etc.), enters or manipulates data in that space, causes the entered data to be submitted in a request, and then the data entry mechanism is reset for the next entry so that the user can easily initiate another input action. Since the 205 status code implies that no additional content will be provided, a server MUST NOT generate a payload in a 205 response.

The 206 (Partial Content) status code indicates that the server is successfully fulfilling a range request for the target resource by transferring one or more parts of the selected representation. When a 206 response is generated, the server MUST generate the following header fields, in addition to those required in the subsections below, if the field would have been sent in a 200 (OK) response to the same request: Date, Cache-Control, ETag, Expires, Content-Location, and Vary. A Content-Length field present in a 206 response indicates the number of octets in the body of this message, which is usually not the complete length of the selected representation. Each Content-Range field includes information about the selected representation's complete length. If a 206 is generated in response to a request with an If-Range header field, the sender SHOULD NOT generate other representation header fields beyond those required, because the client is understood to already have a prior response containing those header fields. Otherwise, the sender MUST generate all of the representation header fields that would have been sent in a 200 (OK) response to the same request. A 206 response is heuristically cacheable; i.e., unless otherwise indicated by explicit cache controls (see ).

If a single part is being transferred, the server generating the 206 response MUST generate a Content-Range header field, describing what range of the selected representation is enclosed, and a payload consisting of the range. For example: HTTP/1.1 206 Partial Content Date: Wed, 15 Nov 1995 06:25:24 GMT Last-Modified: Wed, 15 Nov 1995 04:58:08 GMT Content-Range: bytes 21010-47021/47022 Content-Length: 26012 Content-Type: image/gif ... 26012 bytes of partial image data ...

If multiple parts are being transferred, the server generating the 206 response MUST generate a "multipart/byteranges" payload, as defined in , and a Content-Type header field containing the multipart/byteranges media type and its required boundary parameter. To avoid confusion with single-part responses, a server MUST NOT generate a Content-Range header field in the HTTP header section of a multiple part response (this field will be sent in each part instead). Within the header area of each body part in the multipart payload, the server MUST generate a Content-Range header field corresponding to the range being enclosed in that body part. If the selected representation would have had a Content-Type header field in a 200 (OK) response, the server SHOULD generate that same Content-Type field in the header area of each body part. For example: HTTP/1.1 206 Partial Content Date: Wed, 15 Nov 1995 06:25:24 GMT Last-Modified: Wed, 15 Nov 1995 04:58:08 GMT Content-Length: 1741 Content-Type: multipart/byteranges; boundary=THIS_STRING_SEPARATES --THIS_STRING_SEPARATES Content-Type: application/pdf Content-Range: bytes 500-999/8000 ...the first range... --THIS_STRING_SEPARATES Content-Type: application/pdf Content-Range: bytes 7000-7999/8000 ...the second range --THIS_STRING_SEPARATES-- When multiple ranges are requested, a server MAY coalesce any of the ranges that overlap, or that are separated by a gap that is smaller than the overhead of sending multiple parts, regardless of the order in which the corresponding range-spec appeared in the received Range header field. Since the typical overhead between parts of a multipart/byteranges payload is around 80 bytes, depending on the selected representation's media type and the chosen boundary parameter length, it can be less efficient to transfer many small disjoint parts than it is to transfer the entire selected representation. A server MUST NOT generate a multipart response to a request for a single range, since a client that does not request multiple parts might not support multipart responses. However, a server MAY generate a multipart/byteranges payload with only a single body part if multiple ranges were requested and only one range was found to be satisfiable or only one range remained after coalescing. A client that cannot process a multipart/byteranges response MUST NOT generate a request that asks for multiple ranges. When a multipart response payload is generated, the server SHOULD send the parts in the same order that the corresponding range-spec appeared in the received Range header field, excluding those ranges that were deemed unsatisfiable or that were coalesced into other ranges. A client that receives a multipart response MUST inspect the Content-Range header field present in each body part in order to determine which range is contained in that body part; a client cannot rely on receiving the same ranges that it requested, nor the same order that it requested.

A response might transfer only a subrange of a representation if the connection closed prematurely or if the request used one or more Range specifications. After several such transfers, a client might have received several ranges of the same representation. These ranges can only be safely combined if they all have in common the same strong validator (). A client that has received multiple partial responses to GET requests on a target resource MAY combine those responses into a larger continuous range if they share the same strong validator. If the most recent response is an incomplete 200 (OK) response, then the header fields of that response are used for any combined response and replace those of the matching stored responses. If the most recent response is a 206 (Partial Content) response and at least one of the matching stored responses is a 200 (OK), then the combined response header fields consist of the most recent 200 response's header fields. If all of the matching stored responses are 206 responses, then the stored response with the most recent header fields is used as the source of header fields for the combined response, except that the client MUST use other header fields provided in the new response, aside from Content-Range, to replace all instances of the corresponding header fields in the stored response. The combined response message body consists of the union of partial content ranges in the new response and each of the selected responses. If the union consists of the entire range of the representation, then the client MUST process the combined response as if it were a complete 200 (OK) response, including a Content-Length header field that reflects the complete length. Otherwise, the client MUST process the set of continuous ranges as one of the following: an incomplete 200 (OK) response if the combined response is a prefix of the representation, a single 206 (Partial Content) response containing a multipart/byteranges body, or multiple 206 (Partial Content) responses, each with one continuous range that is indicated by a Content-Range header field.

The 3xx (Redirection) class of status code indicates that further action needs to be taken by the user agent in order to fulfill the request. There are several types of redirects:

1. Redirects that indicate this resource might be available at a different URI, as provided by the Location field, as in the status codes 301 (Moved Permanently), 302 (Found), 307 (Temporary Redirect), and 308 (Permanent Redirect).
2. Redirection that offers a choice among matching resources capable of representing this resource, as in the 300 (Multiple Choices) status code.
3. Redirection to a different resource, identified by the Location field, that can represent an indirect response to the request, as in the 303 (See Other) status code.
4. Redirection to a previously stored result, as in the 304 (Not Modified) status code.

If a Location header field () is provided, the user agent MAY automatically redirect its request to the URI referenced by the Location field value, even if the specific status code is not understood. Automatic redirection needs to be done with care for methods not known to be safe, as defined in , since the user might not wish to redirect an unsafe request. When automatically following a redirected request, the user agent SHOULD resend the original request message with the following modifications:

1. Replace the target URI with the URI referenced by the redirection response's Location header field value after resolving it relative to the original request's target URI.
2. Remove header fields that were automatically generated by the implementation, replacing them with updated values as appropriate to the new request. This includes:
   1. Connection-specific header fields (see ),
   2. Header fields specific to the client's proxy configuration, including (but not limited to) Proxy-Authorization,
   3. Origin-specific header fields (if any), including (but not limited to) Host,
   4. Validating header fields that were added by the implementation's cache (e.g., If-None-Match, If-Modified-Since),
   5. Resource-specific header fields, including (but not limited to) Referer, Origin, Authorization, and Cookie.
3. Consider removing header fields that were not automatically generated by the implementation (i.e., those present in the request because they were added by the calling context) where there are security implications; this includes but is not limited to Authorization and Cookie.
4. Change the request method according to the redirecting status code's semantics, if applicable.
5. If the request method has been changed to GET or HEAD, remove content-specific header fields, including (but not limited to) Content-Encoding, Content-Language, Content-Location, Content-Type, Content-Length, Digest, ETag, Last-Modified.

A client SHOULD detect and intervene in cyclical redirections (i.e., "infinite" redirection loops).

The 300 (Multiple Choices) status code indicates that the target resource has more than one representation, each with its own more specific identifier, and information about the alternatives is being provided so that the user (or user agent) can select a preferred representation by redirecting its request to one or more of those identifiers. In other words, the server desires that the user agent engage in reactive negotiation to select the most appropriate representation(s) for its needs (). If the server has a preferred choice, the server SHOULD generate a Location header field containing a preferred choice's URI reference. The user agent MAY use the Location field value for automatic redirection. For request methods other than HEAD, the server SHOULD generate a payload in the 300 response containing a list of representation metadata and URI reference(s) from which the user or user agent can choose the one most preferred. The user agent MAY make a selection from that list automatically if it understands the provided media type. A specific format for automatic selection is not defined by this specification because HTTP tries to remain orthogonal to the definition of its payloads. In practice, the representation is provided in some easily parsed format believed to be acceptable to the user agent, as determined by shared design or content negotiation, or in some commonly accepted hypertext format. A 300 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see ).

The 301 (Moved Permanently) status code indicates that the target resource has been assigned a new permanent URI and any future references to this resource ought to use one of the enclosed URIs. Clients with link-editing capabilities ought to automatically re-link references to the target URI to one or more of the new references sent by the server, where possible. The server SHOULD generate a Location header field in the response containing a preferred URI reference for the new permanent URI. The user agent MAY use the Location field value for automatic redirection. The server's response payload usually contains a short hypertext note with a hyperlink to the new URI(s). A 301 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see ).

The 302 (Found) status code indicates that the target resource resides temporarily under a different URI. Since the redirection might be altered on occasion, the client ought to continue to use the target URI for future requests. The server SHOULD generate a Location header field in the response containing a URI reference for the different URI. The user agent MAY use the Location field value for automatic redirection. The server's response payload usually contains a short hypertext note with a hyperlink to the different URI(s).

The 303 (See Other) status code indicates that the server is redirecting the user agent to a different resource, as indicated by a URI in the Location header field, which is intended to provide an indirect response to the original request. A user agent can perform a retrieval request targeting that URI (a GET or HEAD request if using HTTP), which might also be redirected, and present the eventual result as an answer to the original request. Note that the new URI in the Location header field is not considered equivalent to the target URI. This status code is applicable to any HTTP method. It is primarily used to allow the output of a POST action to redirect the user agent to a selected resource, since doing so provides the information corresponding to the POST response in a form that can be separately identified, bookmarked, and cached, independent of the original request. A 303 response to a GET request indicates that the origin server does not have a representation of the target resource that can be transferred by the server over HTTP. However, the Location field value refers to a resource that is descriptive of the target resource, such that making a retrieval request on that other resource might result in a representation that is useful to recipients without implying that it represents the original target resource. Note that answers to the questions of what can be represented, what representations are adequate, and what might be a useful description are outside the scope of HTTP. Except for responses to a HEAD request, the representation of a 303 response ought to contain a short hypertext note with a hyperlink to the same URI reference provided in the Location header field.

The 304 (Not Modified) status code indicates that a conditional GET or HEAD request has been received and would have resulted in a 200 (OK) response if it were not for the fact that the condition evaluated to false. In other words, there is no need for the server to transfer a representation of the target resource because the request indicates that the client, which made the request conditional, already has a valid representation; the server is therefore redirecting the client to make use of that stored representation as if it were the payload of a 200 (OK) response. The server generating a 304 response MUST generate any of the following header fields that would have been sent in a 200 (OK) response to the same request: Cache-Control, Content-Location, Date, ETag, Expires, and Vary. Since the goal of a 304 response is to minimize information transfer when the recipient already has one or more cached representations, a sender SHOULD NOT generate representation metadata other than the above listed fields unless said metadata exists for the purpose of guiding cache updates (e.g., Last-Modified might be useful if the response does not have an ETag field). Requirements on a cache that receives a 304 response are defined in . If the conditional request originated with an outbound client, such as a user agent with its own cache sending a conditional GET to a shared proxy, then the proxy SHOULD forward the 304 response to that client. A 304 response cannot contain a message-body; it is always terminated by the first empty line after the header fields.

The 305 (Use Proxy) status code was defined in a previous version of this specification and is now deprecated ().

The 306 status code was defined in a previous version of this specification, is no longer used, and the code is reserved.

The 307 (Temporary Redirect) status code indicates that the target resource resides temporarily under a different URI and the user agent MUST NOT change the request method if it performs an automatic redirection to that URI. Since the redirection can change over time, the client ought to continue using the original target URI for future requests. The server SHOULD generate a Location header field in the response containing a URI reference for the different URI. The user agent MAY use the Location field value for automatic redirection. The server's response payload usually contains a short hypertext note with a hyperlink to the different URI(s).

The 308 (Permanent Redirect) status code indicates that the target resource has been assigned a new permanent URI and any future references to this resource ought to use one of the enclosed URIs. Clients with link editing capabilities ought to automatically re-link references to the target URI to one or more of the new references sent by the server, where possible. The server SHOULD generate a Location header field in the response containing a preferred URI reference for the new permanent URI. The user agent MAY use the Location field value for automatic redirection. The server's response payload usually contains a short hypertext note with a hyperlink to the new URI(s). A 308 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see ).

The 4xx (Client Error) class of status code indicates that the client seems to have erred. Except when responding to a HEAD request, the server SHOULD send a representation containing an explanation of the error situation, and whether it is a temporary or permanent condition. These status codes are applicable to any request method. User agents SHOULD display any included representation to the user.

The 400 (Bad Request) status code indicates that the server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).

The 401 (Unauthorized) status code indicates that the request has not been applied because it lacks valid authentication credentials for the target resource. The server generating a 401 response MUST send a WWW-Authenticate header field () containing at least one challenge applicable to the target resource. If the request included authentication credentials, then the 401 response indicates that authorization has been refused for those credentials. The user agent MAY repeat the request with a new or replaced Authorization header field (). If the 401 response contains the same challenge as the prior response, and the user agent has already attempted authentication at least once, then the user agent SHOULD present the enclosed representation to the user, since it usually contains relevant diagnostic information.

The 402 (Payment Required) status code is reserved for future use.

The 403 (Forbidden) status code indicates that the server understood the request but refuses to fulfill it. A server that wishes to make public why the request has been forbidden can describe that reason in the response payload (if any). If authentication credentials were provided in the request, the server considers them insufficient to grant access. The client SHOULD NOT automatically repeat the request with the same credentials. The client MAY repeat the request with new or different credentials. However, a request might be forbidden for reasons unrelated to the credentials. An origin server that wishes to "hide" the current existence of a forbidden target resource MAY instead respond with a status code of 404 (Not Found).

The 404 (Not Found) status code indicates that the origin server did not find a current representation for the target resource or is not willing to disclose that one exists. A 404 status code does not indicate whether this lack of representation is temporary or permanent; the 410 (Gone) status code is preferred over 404 if the origin server knows, presumably through some configurable means, that the condition is likely to be permanent. A 404 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see ).

The 405 (Method Not Allowed) status code indicates that the method received in the request-line is known by the origin server but not supported by the target resource. The origin server MUST generate an Allow header field in a 405 response containing a list of the target resource's currently supported methods. A 405 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see ).

The 406 (Not Acceptable) status code indicates that the target resource does not have a current representation that would be acceptable to the user agent, according to the proactive negotiation header fields received in the request (), and the server is unwilling to supply a default representation. The server SHOULD generate a payload containing a list of available representation characteristics and corresponding resource identifiers from which the user or user agent can choose the one most appropriate. A user agent MAY automatically select the most appropriate choice from that list. However, this specification does not define any standard for such automatic selection, as described in .

The 407 (Proxy Authentication Required) status code is similar to 401 (Unauthorized), but it indicates that the client needs to authenticate itself in order to use a proxy for this request. The proxy MUST send a Proxy-Authenticate header field () containing a challenge applicable to that proxy for the request. The client MAY repeat the request with a new or replaced Proxy-Authorization header field ().

The 408 (Request Timeout) status code indicates that the server did not receive a complete request message within the time that it was prepared to wait. If the client has an outstanding request in transit, the client MAY repeat that request on a new connection.

The 409 (Conflict) status code indicates that the request could not be completed due to a conflict with the current state of the target resource. This code is used in situations where the user might be able to resolve the conflict and resubmit the request. The server SHOULD generate a payload that includes enough information for a user to recognize the source of the conflict. Conflicts are most likely to occur in response to a PUT request. For example, if versioning were being used and the representation being PUT included changes to a resource that conflict with those made by an earlier (third-party) request, the origin server might use a 409 response to indicate that it can't complete the request. In this case, the response representation would likely contain information useful for merging the differences based on the revision history.

The 410 (Gone) status code indicates that access to the target resource is no longer available at the origin server and that this condition is likely to be permanent. If the origin server does not know, or has no facility to determine, whether or not the condition is permanent, the status code 404 (Not Found) ought to be used instead. The 410 response is primarily intended to assist the task of web maintenance by notifying the recipient that the resource is intentionally unavailable and that the server owners desire that remote links to that resource be removed. Such an event is common for limited-time, promotional services and for resources belonging to individuals no longer associated with the origin server's site. It is not necessary to mark all permanently unavailable resources as "gone" or to keep the mark for any length of time — that is left to the discretion of the server owner. A 410 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see ).

The 411 (Length Required) status code indicates that the server refuses to accept the request without a defined Content-Length (). The client MAY repeat the request if it adds a valid Content-Length header field containing the length of the message body in the request message.

The 412 (Precondition Failed) status code indicates that one or more conditions given in the request header fields evaluated to false when tested on the server. This response status code allows the client to place preconditions on the current resource state (its current representations and metadata) and, thus, prevent the request method from being applied if the target resource is in an unexpected state.

The 413 (Payload Too Large) status code indicates that the server is refusing to process a request because the request payload is larger than the server is willing or able to process. The server MAY terminate the request, if the protocol version in use allows it; otherwise, the server MAY close the connection. If the condition is temporary, the server SHOULD generate a Retry-After header field to indicate that it is temporary and after what time the client MAY try again.

The 414 (URI Too Long) status code indicates that the server is refusing to service the request because the target URI is longer than the server is willing to interpret. This rare condition is only likely to occur when a client has improperly converted a POST request to a GET request with long query information, when the client has descended into a "black hole" of redirection (e.g., a redirected URI prefix that points to a suffix of itself) or when the server is under attack by a client attempting to exploit potential security holes. A 414 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see ).

The 415 (Unsupported Media Type) status code indicates that the origin server is refusing to service the request because the payload is in a format not supported by this method on the target resource. The format problem might be due to the request's indicated Content-Type or Content-Encoding, or as a result of inspecting the data directly. If the problem was caused by an unsupported content coding, the Accept-Encoding response header field () ought to be used to indicate what (if any) content codings would have been accepted in the request. On the other hand, if the cause was an unsupported media type, the Accept response header field () can be used to indicate what media types would have been accepted in the request.

The 416 (Range Not Satisfiable) status code indicates that the set of ranges in the request's Range header field () has been rejected either because none of the requested ranges are satisfiable or because the client has requested an excessive number of small or overlapping ranges (a potential denial of service attack). Each range unit defines what is required for its own range sets to be satisfiable. For example, defines what makes a bytes range set satisfiable. When this status code is generated in response to a byte-range request, the sender SHOULD generate a Content-Range header field specifying the current length of the selected representation (). For example: HTTP/1.1 416 Range Not Satisfiable Date: Fri, 20 Jan 2012 15:41:54 GMT Content-Range: bytes */47022

The 417 (Expectation Failed) status code indicates that the expectation given in the request's Expect header field () could not be met by at least one of the inbound servers.

was an April 1 RFC that lampooned the various ways HTTP was abused; one such abuse was the definition of an application-specific 418 status code. In the intervening years, this status code has been widely implemented as an "Easter Egg", and therefore is effectively consumed by this use. Therefore, the 418 status code is reserved in the IANA HTTP Status Code Registry. This indicates that the status code cannot be assigned to other applications currently. If future circumstances require its use (e.g., exhaustion of 4NN status codes), it can be re-assigned to another use.

The 422 (Unprocessable Payload) status code indicates that the server understands the content type of the request payload (hence a 415 (Unsupported Media Type) status code is inappropriate), and the syntax of the request payload is correct, but was unable to process the contained instructions. For example, this status code can be sent if an XML request payload contains well-formed (i.e., syntactically correct), but semantically erroneous XML instructions.

The 426 (Upgrade Required) status code indicates that the server refuses to perform the request using the current protocol but might be willing to do so after the client upgrades to a different protocol. The server MUST send an Upgrade header field in a 426 response to indicate the required protocol(s) (). Example: HTTP/1.1 426 Upgrade Required Upgrade: HTTP/3.0 Connection: Upgrade Content-Length: Content-Type: text/plain This service requires use of the HTTP/3.0 protocol.

The 5xx (Server Error) class of status code indicates that the server is aware that it has erred or is incapable of performing the requested method. Except when responding to a HEAD request, the server SHOULD send a representation containing an explanation of the error situation, and whether it is a temporary or permanent condition. A user agent SHOULD display any included representation to the user. These response codes are applicable to any request method.

The 500 (Internal Server Error) status code indicates that the server encountered an unexpected condition that prevented it from fulfilling the request.

The 501 (Not Implemented) status code indicates that the server does not support the functionality required to fulfill the request. This is the appropriate response when the server does not recognize the request method and is not capable of supporting it for any resource. A 501 response is heuristically cacheable; i.e., unless otherwise indicated by the method definition or explicit cache controls (see ).

The 502 (Bad Gateway) status code indicates that the server, while acting as a gateway or proxy, received an invalid response from an inbound server it accessed while attempting to fulfill the request.

The 503 (Service Unavailable) status code indicates that the server is currently unable to handle the request due to a temporary overload or scheduled maintenance, which will likely be alleviated after some delay. The server MAY send a Retry-After header field () to suggest an appropriate amount of time for the client to wait before retrying the request.

The 504 (Gateway Timeout) status code indicates that the server, while acting as a gateway or proxy, did not receive a timely response from an upstream server it needed to access in order to complete the request.

The 505 (HTTP Version Not Supported) status code indicates that the server does not support, or refuses to support, the major version of HTTP that was used in the request message. The server is indicating that it is unable or unwilling to complete the request using the same major version as the client, as described in , other than with this error message. The server SHOULD generate a representation for the 505 response that describes why that version is not supported and what other protocols are supported by that server.

HTTP defines a number of generic extension points that can be used to introduce capabilities to the protocol without introducing a new version, including methods, status codes, field names, and further extensibility points within defined fields, such as authentication schemes and cache-directives (see Cache-Control in ). Because the semantics of HTTP are not versioned, these extension points are persistent; the version of the protocol in use does not affect their semantics. Version-independent extensions are discouraged from depending on or interacting with the specific version of the protocol in use. When this is unavoidable, careful consideration needs to be given to how the extension can interoperate across versions. Additionally, specific versions of HTTP might have their own extensibility points, such as transfer-codings in HTTP/1.1 () and HTTP/2 () SETTINGS or frame types. These extension points are specific to the version of the protocol they occur within. Version-specific extensions cannot override or modify the semantics of a version-independent mechanism or extension point (like a method or header field) without explicitly being allowed by that protocol element. For example, the CONNECT method () allows this. These guidelines assure that the protocol operates correctly and predictably, even when parts of the path implement different versions of HTTP.

The "Hypertext Transfer Protocol (HTTP) Method Registry", maintained by IANA at , registers method names. HTTP method registrations MUST include the following fields:

• Method Name (see )
• Safe ("yes" or "no", see )
• Idempotent ("yes" or "no", see )
• Pointer to specification text

Values to be added to this namespace require IETF Review (see ).

Standardized methods are generic; that is, they are potentially applicable to any resource, not just one particular media type, kind of resource, or application. As such, it is preferred that new methods be registered in a document that isn't specific to a single application or data format, since orthogonal technologies deserve orthogonal specification. Since message parsing () needs to be independent of method semantics (aside from responses to HEAD), definitions of new methods cannot change the parsing algorithm or prohibit the presence of a message body on either the request or the response message. Definitions of new methods can specify that only a zero-length message body is allowed by requiring a Content-Length header field with a value of "0". A new method definition needs to indicate whether it is safe (), idempotent (), cacheable (), what semantics are to be associated with the payload body if any is present in the request and what refinements the method makes to header field or status code semantics. If the new method is cacheable, its definition ought to describe how, and under what conditions, a cache can store a response and use it to satisfy a subsequent request. The new method ought to describe whether it can be made conditional () and, if so, how a server responds when the condition is false. Likewise, if the new method might have some use for partial response semantics (), it ought to document this, too.

The "Hypertext Transfer Protocol (HTTP) Status Code Registry", maintained by IANA at , registers status code numbers. A registration MUST include the following fields:

• Status Code (3 digits)
• Short Description
• Pointer to specification text

Values to be added to the HTTP status code namespace require IETF Review (see ).

When it is necessary to express semantics for a response that are not defined by current status codes, a new status code can be registered. Status codes are generic; they are potentially applicable to any resource, not just one particular media type, kind of resource, or application of HTTP. As such, it is preferred that new status codes be registered in a document that isn't specific to a single application. New status codes are required to fall under one of the categories defined in . To allow existing parsers to process the response message, new status codes cannot disallow a payload, although they can mandate a zero-length payload body. Proposals for new status codes that are not yet widely deployed ought to avoid allocating a specific number for the code until there is clear consensus that it will be registered; instead, early drafts can use a notation such as "4NN", or "3N0" .. "3N9", to indicate the class of the proposed status code(s) without consuming a number prematurely. The definition of a new status code ought to explain the request conditions that would cause a response containing that status code (e.g., combinations of request header fields and/or method(s)) along with any dependencies on response header fields (e.g., what fields are required, what fields can modify the semantics, and what field semantics are further refined when used with the new status code). By default, a status code applies only to the request corresponding to the response it occurs within. If a status code applies to a larger scope of applicability — for example, all requests to the resource in question, or all requests to a server — this must be explicitly specified. When doing so, it should be noted that not all clients can be expected to consistently apply a larger scope, because they might not understand the new status code. The definition of a new status code ought to specify whether or not it is cacheable. Note that all status codes can be cached if the response they occur in has explicit freshness information; however, status codes that are defined as being cacheable are allowed to be cached without explicit freshness information. Likewise, the definition of a status code can place constraints upon cache behavior. See for more information. Finally, the definition of a new status code ought to indicate whether the payload has any implied association with an identified resource ().

The "Hypertext Transfer Protocol (HTTP) Field Name Registry" defines the namespace for HTTP field names. Any party can request registration of a HTTP field. See for considerations to take into account when creating a new HTTP field. The "Hypertext Transfer Protocol (HTTP) Field Name Registry" is located at . Registration requests can be made by following the instructions located there or by sending an email to the "ietf-http-wg@ietf.org" mailing list. Field names are registered on the advice of a Designated Expert (appointed by the IESG or their delegate). Fields with the status 'permanent' are Specification Required (). Registration requests consist of at least the following information:

Field name:

The requested field name. It MUST conform to the field-name syntax defined in , and SHOULD be restricted to just letters, digits, hyphen ('-') and underscore ('_') characters, with the first character being a letter.

Status:

"permanent" or "provisional".

Specification document(s):

Reference to the document that specifies the field, preferably including a URI that can be used to retrieve a copy of the document. An indication of the relevant section(s) can also be included, but is not required.

And, optionally:

Comments:

Additional information, such as about reserved entries.

The Expert(s) can define additional fields to be collected in the registry, in consultation with the community. Standards-defined names have a status of "permanent". Other names can also be registered as permanent, if the Expert(s) find that they are in use, in consultation with the community. Other names should be registered as "provisional". Provisional entries can be removed by the Expert(s) if — in consultation with the community — the Expert(s) find that they are not in use. The Experts can change a provisional entry's status to permanent at any time. Note that names can be registered by third parties (including the Expert(s)), if the Expert(s) determines that an unregistered name is widely deployed and not likely to be registered in a timely manner otherwise.

There is no limit on the introduction of new field names, each presumably defining new semantics. New fields can be defined such that, when they are understood by a recipient, they might override or enhance the interpretation of previously defined fields, define preconditions on request evaluation, or refine the meaning of responses. Authors of specifications defining new fields are advised to choose a short but descriptive field name. Short names avoid needless data transmission; descriptive names avoid confusion and "squatting" on names that might have broader uses. To that end, limited-use fields (such as a header confined to a single application or use case) are encouraged to use a name that includes its name (or an abbreviation) as a prefix; for example, if the Foo Application needs a Description field, it might use "Foo-Desc"; "Description" is too generic, and "Foo-Description" is needlessly long. While the field-name syntax is defined to allow any token character, in practice some implementations place limits on the characters they accept in field-names. To be interoperable, new field names SHOULD constrain themselves to alphanumeric characters, "-", and ".", and SHOULD begin with an alphanumeric character. Field names ought not be prefixed with "X-"; see for further information. Other prefixes are sometimes used in HTTP field names; for example, "Accept-" is used in many content negotiation headers. These prefixes are only an aid to recognizing the purpose of a field, and do not trigger automatic processing.

Authors of specifications defining new fields are advised to consider documenting:

• Whether the field has a singleton or list-based value (see ). If it is a singleton field, document how to treat messages where the multiple members are present (a sensible default would be to ignore the field, but this might not always be the right choice). Note that intermediaries and software libraries might combine multiple field instances into a single one, despite the field being defined as a singleton. A robust format enables recipients to discover these situations (good example: "Content-Type", as the comma can only appear inside quoted strings; bad example: "Location", as a comma can occur inside a URI).
• Under what conditions the field can be used; e.g., only in responses or requests, in all messages, only on responses to a particular request method, etc.
• What the scope of applicability for the information conveyed in the field is. By default, fields apply only to the message they are associated with, but some response fields are designed to apply to all representations of a resource, the resource itself, or an even broader scope. Specifications that expand the scope of a response field will need to carefully consider issues such as content negotiation, the time period of applicability, and (in some cases) multi-tenant server deployments.
• Whether the field should be stored by origin servers that understand it upon a PUT request.
• Whether the field semantics are further refined by the context, such as by existing request methods or status codes.
• Whether it is appropriate to list the field name in the Connection header field (i.e., if the field is to be hop-by-hop; see ).
• Under what conditions intermediaries are allowed to insert, delete, or modify the field's value.
• Whether it is appropriate to list the field name in a Vary response header field (e.g., when the request header field is used by an origin server's content selection algorithm; see ).
• Whether the field is allowable in trailers (see ).
• Whether the field ought to be preserved across redirects.
• Whether it introduces any additional security considerations, such as disclosure of privacy-related data.

The "Hypertext Transfer Protocol (HTTP) Authentication Scheme Registry" defines the namespace for the authentication schemes in challenges and credentials. It is maintained at . Registrations MUST include the following fields:

• Authentication Scheme Name
• Pointer to specification text
• Notes (optional)

Values to be added to this namespace require IETF Review (see ).

There are certain aspects of the HTTP Authentication framework that put constraints on how new authentication schemes can work:

• HTTP authentication is presumed to be stateless: all of the information necessary to authenticate a request MUST be provided in the request, rather than be dependent on the server remembering prior requests. Authentication based on, or bound to, the underlying connection is outside the scope of this specification and inherently flawed unless steps are taken to ensure that the connection cannot be used by any party other than the authenticated user (see ).
• The authentication parameter "realm" is reserved for defining protection spaces as described in . New schemes MUST NOT use it in a way incompatible with that definition.
• The "token68" notation was introduced for compatibility with existing authentication schemes and can only be used once per challenge or credential. Thus, new schemes ought to use the auth-param syntax instead, because otherwise future extensions will be impossible.
• The parsing of challenges and credentials is defined by this specification and cannot be modified by new authentication schemes. When the auth-param syntax is used, all parameters ought to support both token and quoted-string syntax, and syntactical constraints ought to be defined on the field value after parsing (i.e., quoted-string processing). This is necessary so that recipients can use a generic parser that applies to all authentication schemes. Note: The fact that the value syntax for the "realm" parameter is restricted to quoted-string was a bad design choice not to be repeated for new parameters.
• Definitions of new schemes ought to define the treatment of unknown extension parameters. In general, a "must-ignore" rule is preferable to a "must-understand" rule, because otherwise it will be hard to introduce new parameters in the presence of legacy recipients. Furthermore, it's good to describe the policy for defining new parameters (such as "update the specification" or "use this registry").
• Authentication schemes need to document whether they are usable in origin-server authentication (i.e., using WWW-Authenticate), and/or proxy authentication (i.e., using Proxy-Authenticate).
• The credentials carried in an Authorization header field are specific to the user agent and, therefore, have the same effect on HTTP caches as the "private" Cache-Control response directive (), within the scope of the request in which they appear. Therefore, new authentication schemes that choose not to carry credentials in the Authorization header field (e.g., using a newly defined header field) will need to explicitly disallow caching, by mandating the use of Cache-Control response directives (e.g., "private").
• Schemes using Authentication-Info, Proxy-Authentication-Info, or any other authentication related response header field need to consider and document the related security considerations (see ).

The "HTTP Range Unit Registry" defines the namespace for the range unit names and refers to their corresponding specifications. It is maintained at . Registration of an HTTP Range Unit MUST include the following fields:

• Name
• Description
• Pointer to specification text

Values to be added to this namespace require IETF Review (see ).

Other range units, such as format-specific boundaries like pages, sections, records, rows, or time, are potentially usable in HTTP for application-specific purposes, but are not commonly used in practice. Implementors of alternative range units ought to consider how they would work with content codings and general-purpose intermediaries.

The "HTTP Content Coding Registry", maintained by IANA at , registers content-coding names. Content coding registrations MUST include the following fields:

• Name
• Description
• Pointer to specification text

Names of content codings MUST NOT overlap with names of transfer codings (), unless the encoding transformation is identical (as is the case for the compression codings defined in ). Values to be added to this namespace require IETF Review (see ) and MUST conform to the purpose of content coding defined in .

New content codings ought to be self-descriptive whenever possible, with optional parameters discoverable within the coding format itself, rather than rely on external metadata that might be lost during transit.

The "Hypertext Transfer Protocol (HTTP) Upgrade Token Registry" defines the namespace for protocol-name tokens used to identify protocols in the Upgrade header field. The registry is maintained at . Each registered protocol name is associated with contact information and an optional set of specifications that details how the connection will be processed after it has been upgraded. Registrations happen on a "First Come First Served" basis (see ) and are subject to the following rules:

1. A protocol-name token, once registered, stays registered forever.
2. A protocol-name token is case-insensitive and registered with the preferred case to be generated by senders.
3. The registration MUST name a responsible party for the registration.
4. The registration MUST name a point of contact.
5. The registration MAY name a set of specifications associated with that token. Such specifications need not be publicly available.
6. The registration SHOULD name a set of expected "protocol-version" tokens associated with that token at the time of registration.
7. The responsible party MAY change the registration at any time. The IANA will keep a record of all such changes, and make them available upon request.
8. The IESG MAY reassign responsibility for a protocol token. This will normally only be used in the case when a responsible party cannot be contacted.

This section is meant to inform developers, information providers, and users of known security concerns relevant to HTTP semantics and its use for transferring information over the Internet. Considerations related to message syntax, parsing, and routing are discussed in . The list of considerations below is not exhaustive. Most security concerns related to HTTP semantics are about securing server-side applications (code behind the HTTP interface), securing user agent processing of payloads received via HTTP, or secure use of the Internet in general, rather than security of the protocol. Various organizations maintain topical information and links to current research on Web application security (e.g., ).

HTTP relies on the notion of an authoritative response: a response that has been determined by (or at the direction of) the origin server identified within the target URI to be the most appropriate response for that request given the state of the target resource at the time of response message origination. When a registered name is used in the authority component, the "http" URI scheme () relies on the user's local name resolution service to determine where it can find authoritative responses. This means that any attack on a user's network host table, cached names, or name resolution libraries becomes an avenue for attack on establishing authority for "http" URIs. Likewise, the user's choice of server for Domain Name Service (DNS), and the hierarchy of servers from which it obtains resolution results, could impact the authenticity of address mappings; DNS Security Extensions (DNSSEC, ) are one way to improve authenticity. Furthermore, after an IP address is obtained, establishing authority for an "http" URI is vulnerable to attacks on Internet Protocol routing. The "https" scheme () is intended to prevent (or at least reveal) many of these potential attacks on establishing authority, provided that the negotiated connection is secured and the client properly verifies that the communicating server's identity matches the target URI's authority component (). Correctly implementing such verification can be difficult (see ). Authority for a given origin server can be delegated through protocol extensions; for example, . Likewise, the set of servers that a connection is considered authoritative for can be changed with a protocol extension like . Providing a response from a non-authoritative source, such as a shared proxy cache, is often useful to improve performance and availability, but only to the extent that the source can be trusted or the distrusted response can be safely used. Unfortunately, communicating authority to users can be difficult. For example, phishing is an attack on the user's perception of authority, where that perception can be misled by presenting similar branding in hypertext, possibly aided by userinfo obfuscating the authority component (see ). User agents can reduce the impact of phishing attacks by enabling users to easily inspect a target URI prior to making an action, by prominently distinguishing (or rejecting) userinfo when present, and by not sending stored credentials and cookies when the referring document is from an unknown or untrusted source.

HTTP intermediaries are inherently situated for on-path attacks. Compromise of the systems on which the intermediaries run can result in serious security and privacy problems. Intermediaries might have access to security-related information, personal information about individual users and organizations, and proprietary information belonging to users and content providers. A compromised intermediary, or an intermediary implemented or configured without regard to security and privacy considerations, might be used in the commission of a wide range of potential attacks. Intermediaries that contain a shared cache are especially vulnerable to cache poisoning attacks, as described in . Implementers need to consider the privacy and security implications of their design and coding decisions, and of the configuration options they provide to operators (especially the default configuration). Users need to be aware that intermediaries are no more trustworthy than the people who run them; HTTP itself cannot solve this problem.

Origin servers frequently make use of their local file system to manage the mapping from target URI to resource representations. Most file systems are not designed to protect against malicious file or path names. Therefore, an origin server needs to avoid accessing names that have a special significance to the system when mapping the target resource to files, folders, or directories. For example, UNIX, Microsoft Windows, and other operating systems use ".." as a path component to indicate a directory level above the current one, and they use specially named paths or file names to send data to system devices. Similar naming conventions might exist within other types of storage systems. Likewise, local storage systems have an annoying tendency to prefer user-friendliness over security when handling invalid or unexpected characters, recomposition of decomposed characters, and case-normalization of case-insensitive names. Attacks based on such special names tend to focus on either denial-of-service (e.g., telling the server to read from a COM port) or disclosure of configuration and source files that are not meant to be served.

Origin servers often use parameters within the URI as a means of identifying system services, selecting database entries, or choosing a data source. However, data received in a request cannot be trusted. An attacker could construct any of the request data elements (method, target URI, header fields, or body) to contain data that might be misinterpreted as a command, code, or query when passed through a command invocation, language interpreter, or database interface. For example, SQL injection is a common attack wherein additional query language is inserted within some part of the target URI or header fields (e.g., Host, Referer, etc.). If the received data is used directly within a SELECT statement, the query language might be interpreted as a database command instead of a simple string value. This type of implementation vulnerability is extremely common, in spite of being easy to prevent. In general, resource implementations ought to avoid use of request data in contexts that are processed or interpreted as instructions. Parameters ought to be compared to fixed strings and acted upon as a result of that comparison, rather than passed through an interface that is not prepared for untrusted data. Received data that isn't based on fixed parameters ought to be carefully filtered or encoded to avoid being misinterpreted. Similar considerations apply to request data when it is stored and later processed, such as within log files, monitoring tools, or when included within a data format that allows embedded scripts.

Because HTTP uses mostly textual, character-delimited fields, parsers are often vulnerable to attacks based on sending very long (or very slow) streams of data, particularly where an implementation is expecting a protocol element with no predefined length (). To promote interoperability, specific recommendations are made for minimum size limits on fields (). These are minimum recommendations, chosen to be supportable even by implementations with limited resources; it is expected that most implementations will choose substantially higher limits. A server can reject a message that has a target URI that is too long () or a request payload that is too large (). Additional status codes related to capacity limits have been defined by extensions to HTTP . Recipients ought to carefully limit the extent to which they process other protocol elements, including (but not limited to) request methods, response status phrases, field names, numeric values, and body chunks. Failure to limit such processing can result in buffer overflows, arithmetic overflows, or increased vulnerability to denial-of-service attacks.

Some attacks on encrypted protocols use the differences in size created by dynamic compression to reveal confidential information; for example, . These attacks rely on creating a redundancy between attacker-controlled content and the confidential information, such that a dynamic compression algorithm using the same dictionary for both content will compress more efficiently when the attacker-controlled content matches parts of the confidential content. HTTP messages can be compressed in a number of ways, including using TLS compression, content-codings, transfer-codings, and other extension or version-specific mechanisms. The most effective mitigation for this risk is to disable compression on sensitive data, or to strictly separate sensitive data from attacker-controlled data so that they cannot share the same compression dictionary. With careful design, a compression scheme can be designed in a way that is not considered exploitable in limited use cases, such as HPACK ().

Clients are often privy to large amounts of personal information, including both information provided by the user to interact with resources (e.g., the user's name, location, mail address, passwords, encryption keys, etc.) and information about the user's browsing activity over time (e.g., history, bookmarks, etc.). Implementations need to prevent unintentional disclosure of personal information.

A server is in the position to save personal data about a user's requests over time, which might identify their reading patterns or subjects of interest. In particular, log information gathered at an intermediary often contains a history of user agent interaction, across a multitude of sites, that can be traced to individual users. HTTP log information is confidential in nature; its handling is often constrained by laws and regulations. Log information needs to be securely stored and appropriate guidelines followed for its analysis. Anonymization of personal information within individual entries helps, but it is generally not sufficient to prevent real log traces from being re-identified based on correlation with other access characteristics. As such, access traces that are keyed to a specific client are unsafe to publish even if the key is pseudonymous. To minimize the risk of theft or accidental publication, log information ought to be purged of personally identifiable information, including user identifiers, IP addresses, and user-provided query parameters, as soon as that information is no longer necessary to support operational needs for security, auditing, or fraud control.

URIs are intended to be shared, not secured, even when they identify secure resources. URIs are often shown on displays, added to templates when a page is printed, and stored in a variety of unprotected bookmark lists. Many servers, proxies, and user agents log or display the target URI in places where it might be visible to third parties. It is therefore unwise to include information within a URI that is sensitive, personally identifiable, or a risk to disclose. When an application uses client-side mechanisms to construct a target URI out of user-provided information, such as the query fields of a form using GET, potentially sensitive data might be provided that would not be appropriate for disclosure within a URI. POST is often preferred in such cases because it usually doesn't construct a URI; instead, POST of a form transmits the potentially sensitive data in the request body. However, this hinders caching and uses an unsafe method for what would otherwise be a safe request. Alternative workarounds include transforming the user-provided data prior to constructing the URI, or filtering the data to only include common values that are not sensitive. Likewise, redirecting the result of a query to a different (server-generated) URI can remove potentially sensitive data from later links and provide a cacheable response for later reuse. Since the Referer header field tells a target site about the context that resulted in a request, it has the potential to reveal information about the user's immediate browsing history and any personal information that might be found in the referring resource's URI. Limitations on the Referer header field are described in to address some of its security considerations.

Although fragment identifiers used within URI references are not sent in requests, implementers ought to be aware that they will be visible to the user agent and any extensions or scripts running as a result of the response. In particular, when a redirect occurs and the original request's fragment identifier is inherited by the new reference in Location (), this might have the effect of disclosing one site's fragment to another site. If the first site uses personal information in fragments, it ought to ensure that redirects to other sites include a (possibly empty) fragment component in order to block that inheritance.

The User-Agent (), Via (), and Server () header fields often reveal information about the respective sender's software systems. In theory, this can make it easier for an attacker to exploit known security holes; in practice, attackers tend to try all potential holes regardless of the apparent software versions being used. Proxies that serve as a portal through a network firewall ought to take special precautions regarding the transfer of header information that might identify hosts behind the firewall. The Via header field allows intermediaries to replace sensitive machine names with pseudonyms.

Browser fingerprinting is a set of techniques for identifying a specific user agent over time through its unique set of characteristics. These characteristics might include information related to its TCP behavior, feature capabilities, and scripting environment, though of particular interest here is the set of unique characteristics that might be communicated via HTTP. Fingerprinting is considered a privacy concern because it enables tracking of a user agent's behavior over time () without the corresponding controls that the user might have over other forms of data collection (e.g., cookies). Many general-purpose user agents (i.e., Web browsers) have taken steps to reduce their fingerprints. There are a number of request header fields that might reveal information to servers that is sufficiently unique to enable fingerprinting. The From header field is the most obvious, though it is expected that From will only be sent when self-identification is desired by the user. Likewise, Cookie header fields are deliberately designed to enable re-identification, so fingerprinting concerns only apply to situations where cookies are disabled or restricted by the user agent's configuration. The User-Agent header field might contain enough information to uniquely identify a specific device, usually when combined with other characteristics, particularly if the user agent sends excessive details about the user's system or extensions. However, the source of unique information that is least expected by users is proactive negotiation (), including the Accept, Accept-Charset, Accept-Encoding, and Accept-Language header fields. In addition to the fingerprinting concern, detailed use of the Accept-Language header field can reveal information the user might consider to be of a private nature. For example, understanding a given language set might be strongly correlated to membership in a particular ethnic group. An approach that limits such loss of privacy would be for a user agent to omit the sending of Accept-Language except for sites that have been whitelisted, perhaps via interaction after detecting a Vary header field that indicates language negotiation might be useful. In environments where proxies are used to enhance privacy, user agents ought to be conservative in sending proactive negotiation header fields. General-purpose user agents that provide a high degree of header field configurability ought to inform users about the loss of privacy that might result if too much detail is provided. As an extreme privacy measure, proxies could filter the proactive negotiation header fields in relayed requests.

The validators defined by this specification are not intended to ensure the validity of a representation, guard against malicious changes, or detect on-path attacks. At best, they enable more efficient cache updates and optimistic concurrent writes when all participants are behaving nicely. At worst, the conditions will fail and the client will receive a response that is no more harmful than an HTTP exchange without conditional requests. An entity-tag can be abused in ways that create privacy risks. For example, a site might deliberately construct a semantically invalid entity-tag that is unique to the user or user agent, send it in a cacheable response with a long freshness time, and then read that entity-tag in later conditional requests as a means of re-identifying that user or user agent. Such an identifying tag would become a persistent identifier for as long as the user agent retained the original cache entry. User agents that cache representations ought to ensure that the cache is cleared or replaced whenever the user performs privacy-maintaining actions, such as clearing stored cookies or changing to a private browsing mode.

Unconstrained multiple range requests are susceptible to denial-of-service attacks because the effort required to request many overlapping ranges of the same data is tiny compared to the time, memory, and bandwidth consumed by attempting to serve the requested data in many parts. Servers ought to ignore, coalesce, or reject egregious range requests, such as requests for more than two overlapping ranges or for many small ranges in a single set, particularly when the ranges are requested out of order for no apparent reason. Multipart range requests are not designed to support random access.

Everything about the topic of HTTP authentication is a security consideration, so the list of considerations below is not exhaustive. Furthermore, it is limited to security considerations regarding the authentication framework, in general, rather than discussing all of the potential considerations for specific authentication schemes (which ought to be documented in the specifications that define those schemes). Various organizations maintain topical information and links to current research on Web application security (e.g., ), including common pitfalls for implementing and using the authentication schemes found in practice.

The HTTP authentication framework does not define a single mechanism for maintaining the confidentiality of credentials; instead, each authentication scheme defines how the credentials are encoded prior to transmission. While this provides flexibility for the development of future authentication schemes, it is inadequate for the protection of existing schemes that provide no confidentiality on their own, or that do not sufficiently protect against replay attacks. Furthermore, if the server expects credentials that are specific to each individual user, the exchange of those credentials will have the effect of identifying that user even if the content within credentials remains confidential. HTTP depends on the security properties of the underlying transport- or session-level connection to provide confidential transmission of fields. In other words, if a server limits access to authenticated users using this framework, the server needs to ensure that the connection is properly secured in accordance with the nature of the authentication scheme used. For example, services that depend on individual user authentication often require a connection to be secured with TLS ("Transport Layer Security", ) prior to exchanging any credentials.

Existing HTTP clients and user agents typically retain authentication information indefinitely. HTTP does not provide a mechanism for the origin server to direct clients to discard these cached credentials, since the protocol has no awareness of how credentials are obtained or managed by the user agent. The mechanisms for expiring or revoking credentials can be specified as part of an authentication scheme definition. Circumstances under which credential caching can interfere with the application's security model include but are not limited to:

• Clients that have been idle for an extended period, following which the server might wish to cause the client to re-prompt the user for credentials.
• Applications that include a session termination indication (such as a "logout" or "commit" button on a page) after which the server side of the application "knows" that there is no further reason for the client to retain the credentials.

User agents that cache credentials are encouraged to provide a readily accessible mechanism for discarding cached credentials under user control.

Authentication schemes that solely rely on the "realm" mechanism for establishing a protection space will expose credentials to all resources on an origin server. Clients that have successfully made authenticated requests with a resource can use the same authentication credentials for other resources on the same origin server. This makes it possible for a different resource to harvest authentication credentials for other resources. This is of particular concern when an origin server hosts resources for multiple parties under the same canonical root URI (). Possible mitigation strategies include restricting direct access to authentication credentials (i.e., not making the content of the Authorization request header field available), and separating protection spaces by using a different host name (or port number) for each party.

Adding information to responses that are sent over an unencrypted channel can affect security and privacy. The presence of the Authentication-Info and Proxy-Authentication-Info header fields alone indicates that HTTP authentication is in use. Additional information could be exposed by the contents of the authentication-scheme specific parameters; this will have to be considered in the definitions of these schemes.

The change controller for the following registrations is: "IETF (iesg@ietf.org) - Internet Engineering Task Force".

Please update the registry of URI Schemes at with the permanent schemes listed in the first table of .

Please update the "Hypertext Transfer Protocol (HTTP) Method Registry" at with the registration procedure of and the method names summarized in the following table.

Method	Safe	Idempotent	Ref.
*	no	no
CONNECT	no	no
DELETE	no	yes
GET	yes	yes
HEAD	yes	yes
OPTIONS	yes	yes
POST	no	no
PUT	no	yes
TRACE	yes	yes

The method name "*" is reserved, since using that name as HTTP method name might conflict with special semantics in fields such as "Access-Control-Request-Method".

Please update the "Hypertext Transfer Protocol (HTTP) Status Code Registry" at with the registration procedure of and the status code values summarized in the following table.

Value	Description	Ref.
100	Continue
101	Switching Protocols
200	OK
201	Created
202	Accepted
203	Non-Authoritative Information
204	No Content
205	Reset Content
206	Partial Content
300	Multiple Choices
301	Moved Permanently
302	Found
303	See Other
304	Not Modified
305	Use Proxy
306	(Unused)
307	Temporary Redirect
308	Permanent Redirect
400	Bad Request
401	Unauthorized
402	Payment Required
403	Forbidden
404	Not Found
405	Method Not Allowed
406	Not Acceptable
407	Proxy Authentication Required
408	Request Timeout
409	Conflict
410	Gone
411	Length Required
412	Precondition Failed
413	Payload Too Large
414	URI Too Long
415	Unsupported Media Type
416	Range Not Satisfiable
417	Expectation Failed
418	(Unused)
422	Unprocessable Payload
426	Upgrade Required
500	Internal Server Error
501	Not Implemented
502	Bad Gateway
503	Service Unavailable
504	Gateway Timeout
505	HTTP Version Not Supported

Additionally, please update the following entry in the Hypertext Transfer Protocol (HTTP) Status Code Registry:

Value:

418

Description:

(Unused)

Reference

Please create a new registry as outlined in . After creating the registry, all entries in the Permanent and Provisional Message Header Registries with the protocol 'http' are to be moved to it, with the following changes applied:

1. The 'Applicable Protocol' field is to be omitted.
2. Entries with a status of 'standard', 'experimental', 'reserved', or 'informational' are to have a status of 'permanent'.
3. Provisional entries without a status are to have a status of 'provisional'.
4. Permanent entries without a status (after confirmation that the registration document did not define one) will have a status of 'provisional'. The Expert(s) can choose to update their status if there is evidence that another is more appropriate.

Please annotate the Permanent and Provisional Message Header registries to indicate that HTTP field name registrations have moved, with an appropriate link. After that is complete, please update the new registry with the field names listed in the following table.

Field Name	Status	Ref.
Accept	standard
Accept-Charset	deprecated
Accept-Encoding	standard
Accept-Language	standard
Accept-Ranges	standard
Allow	standard
Authentication-Info	standard
Authorization	standard
Connection	standard
Content-Encoding	standard
Content-Language	standard
Content-Length	standard
Content-Location	standard
Content-Range	standard
Content-Type	standard
Date	standard
ETag	standard
Expect	standard
From	standard
Host	standard
If-Match	standard
If-Modified-Since	standard
If-None-Match	standard
If-Range	standard
If-Unmodified-Since	standard
Last-Modified	standard
Location	standard
Max-Forwards	standard
Proxy-Authenticate	standard
Proxy-Authentication-Info	standard
Proxy-Authorization	standard
Range	standard
Referer	standard
Retry-After	standard
Server	standard
TE	standard
Trailer	standard
Upgrade	standard
User-Agent	standard
Vary	standard
Via	standard
WWW-Authenticate	standard

Furthermore, the field name "*" is reserved, since using that name as an HTTP header field might conflict with its special semantics in the Vary header field ().

Field Name	Status	Ref.	Comments
*	standard		(reserved)

Finally, please update the "Content-MD5" entry in the new registry to have a status of 'obsoleted' with references to (for the definition of the header field) and (which removed the field definition from the updated specification).

Please update the "Hypertext Transfer Protocol (HTTP) Authentication Scheme Registry" at with the registration procedure of . No authentication schemes are defined in this document.

Please update the "HTTP Content Coding Registry" at with the registration procedure of and the content coding names summarized in the table of .

Please update the "HTTP Range Unit Registry" at with the registration procedure of and the range unit names summarized in the table of .

Please update the "Media Types" registry at with the registration information in for the media type "multipart/byteranges".

Please update the "Service Name and Transport Protocol Port Number" registry at for the services on ports 80 and 443 that use UDP or TCP to:

1. use this document as "Reference", and
2. when currently unspecified, set "Assignee" to "IESG" and "Contact" to "IETF_Chair".

Please update the "Hypertext Transfer Protocol (HTTP) Upgrade Token Registry" at with the registration procedure of and the upgrade token names summarized in the following table.

Name	Description	Expected Version Tokens	Ref.
HTTP	Hypertext Transfer Protocol	any DIGIT.DIGIT (e.g, "2.0")

Innosoft International, Inc.

ned@innosoft.com

First Virtual Holdings

nsb@nsb.fv.com

Innosoft International, Inc.

ned@innosoft.com

First Virtual Holdings

nsb@nsb.fv.com

World Wide Web Consortium

timbl@w3.org http://www.w3.org/People/Berners-Lee/

Day Software

fielding@gbiv.com http://roy.gbiv.com/

Adobe

LMM@acm.org http://larry.masinter.net/

University of Southern California (USC)/Information Sciences Institute Yahoo! Inc.

addison@inter-locale.com

Google

mark.davis@macchiato.com

Brandenburg InternetWorking

dcrocker@bbiw.net

THUS plc.

paul.overell@thus.net

Lab126

addison@inter-locale.com

Google

mark.davis@google.com

pkyzivat@alum.mit.edu

American National Standards Institute Aladdin Enterprises

ghost@aladdin.com

Aladdin Enterprises

ghost@aladdin.com

Aladdin Enterprises

ghost@aladdin.com

gzip@prep.ai.mit.edu

madler@alumni.caltech.edu

ghost@aladdin.com

randeg@alumni.rpi.edu

RFC Errata RFC Errata In Proceedings of the 2012 ACM Conference on Computer and Communications Security (CCS '12), pp. 38-49 International Organization for Standardization WHATWG Doctoral Dissertation, University of California, Irvine

mchatel@pax.eunet.ch

MIT, Laboratory for Computer Science

timbl@w3.org

University of California, Irvine, Department of Information and Computer Science

fielding@ics.uci.edu

W3 Consortium, MIT Laboratory for Computer Science

frystyk@w3.org

University of Tennessee

moore@cs.utk.edu

University of California, Irvine, Department of Information and Computer Science

fielding@ics.uci.edu

MIT Laboratory for Computer Science

jg@w3.org

Digital Equipment Corporation, Western Research Laboratory

mogul@wrl.dec.com

MIT Laboratory for Computer Science

frystyk@w3.org

MIT Laboratory for Computer Science

timbl@w3.org

Western Research Laboratory

mogul@wrl.dec.com

Department of Information and Computer Science

fielding@ics.uci.edu

MIT Laboratory for Computer Science

jg@w3.org

W3 Consortium

frystyk@w3.org

Technische Universiteit Eindhoven

koen@win.tue.nl

Hewlett-Packard Company

mutz@hpl.hp.com

Stockholm University and KTH

jpalme@dsv.su.se

Microsoft Corporation

alexhop@microsoft.com

Lotus Development Corporation

Shelness@lotus.com

stef@nma.com

University of California, Irvine

fielding@ics.uci.edu

W3C

jg@w3.org

Compaq Computer Corporation

mogul@wrl.dec.com

MIT Laboratory for Computer Science

frystyk@w3.org

Xerox Corporation

masinter@parc.xerox.com

Microsoft Corporation

paulle@microsoft.com

W3C

timbl@w3.org

Northwestern University, Department of Mathematics

john@math.nwu.edu

Verisign Inc.

pbaker@verisign.com

AbiSource, Inc.

jeff@AbiSource.com

Agranat Systems, Inc.

lawrence@agranat.com

Microsoft Corporation

paulle@microsoft.com

Netscape Communications Corporation Open Market, Inc.

stewart@OpenMarket.com

frystyk@w3.org

paulle@microsoft.com

lawrence@agranat.com

RTFM, Inc.

ekr@rtfm.com

Equinix, Inc. UNINETT CacheFlow Inc. CommerceNet

ldusseault@commerce.net

Adobe

fielding@gbiv.com

greenbytes GmbH

julian.reschke@greenbytes.de

Adobe

fielding@gbiv.com

greenbytes GmbH

julian.reschke@greenbytes.de

Adobe

fielding@gbiv.com

greenbytes GmbH

julian.reschke@greenbytes.de

Adobe

fielding@gbiv.com

World Wide Web Consortium

ylafon@w3.org

greenbytes GmbH

julian.reschke@greenbytes.de

Adobe

fielding@gbiv.com

greenbytes GmbH

julian.reschke@greenbytes.de

greenbytes GmbH

julian.reschke@greenbytes.de

Oracle

ned+ietf@mrochek.com

john+ietf@jck.com

AT&T Laboratories

tony+mtsuffix@maillennium.att.com

Qualcomm Incorporated Linden Lab University of California, Berkeley

abarth@eecs.berkeley.edu

Rackspace Adobe Avaya Netzkonform greenbytes GmbH

julian.reschke@greenbytes.de

greenbytes GmbH

julian.reschke@greenbytes.de

In the collected ABNF below, list rules are expanded as per . Accept = [ ( media-range [ accept-params ] ) *( OWS "," OWS ( media-range [ accept-params ] ) ) ] Accept-Charset = [ ( ( charset / "*" ) [ weight ] ) *( OWS "," OWS ( ( charset / "*" ) [ weight ] ) ) ] Accept-Encoding = [ ( codings [ weight ] ) *( OWS "," OWS ( codings [ weight ] ) ) ] Accept-Language = [ ( language-range [ weight ] ) *( OWS "," OWS ( language-range [ weight ] ) ) ] Accept-Ranges = acceptable-ranges Allow = [ method *( OWS "," OWS method ) ] Authentication-Info = [ auth-param *( OWS "," OWS auth-param ) ] Authorization = credentials BWS = OWS Connection = [ connection-option *( OWS "," OWS connection-option ) ] Content-Encoding = [ content-coding *( OWS "," OWS content-coding ) ] Content-Language = [ language-tag *( OWS "," OWS language-tag ) ] Content-Length = 1*DIGIT Content-Location = absolute-URI / partial-URI Content-Range = range-unit SP ( range-resp / unsatisfied-range ) Content-Type = media-type Date = HTTP-date ETag = entity-tag Expect = [ expectation *( OWS "," OWS expectation ) ] From = mailbox GMT = %x47.4D.54 ; GMT HTTP-date = IMF-fixdate / obs-date Host = uri-host [ ":" port ] IMF-fixdate = day-name "," SP date1 SP time-of-day SP GMT If-Match = "*" / [ entity-tag *( OWS "," OWS entity-tag ) ] If-Modified-Since = HTTP-date If-None-Match = "*" / [ entity-tag *( OWS "," OWS entity-tag ) ] If-Range = entity-tag / HTTP-date If-Unmodified-Since = HTTP-date Last-Modified = HTTP-date Location = URI-reference Max-Forwards = 1*DIGIT OWS = *( SP / HTAB ) Proxy-Authenticate = [ challenge *( OWS "," OWS challenge ) ] Proxy-Authentication-Info = [ auth-param *( OWS "," OWS auth-param ) ] Proxy-Authorization = credentials RWS = 1*( SP / HTAB ) Range = ranges-specifier Referer = absolute-URI / partial-URI Retry-After = HTTP-date / delay-seconds Server = product *( RWS ( product / comment ) ) TE = [ t-codings *( OWS "," OWS t-codings ) ] Trailer = [ field-name *( OWS "," OWS field-name ) ] URI-reference = <URI-reference, see > Upgrade = [ protocol *( OWS "," OWS protocol ) ] User-Agent = product *( RWS ( product / comment ) ) Vary = [ ( "*" / field-name ) *( OWS "," OWS ( "*" / field-name ) ) ] Via = [ ( received-protocol RWS received-by [ RWS comment ] ) *( OWS "," OWS ( received-protocol RWS received-by [ RWS comment ] ) ) ] WWW-Authenticate = [ challenge *( OWS "," OWS challenge ) ] absolute-URI = <absolute-URI, see > absolute-path = 1*( "/" segment ) accept-ext = OWS ";" OWS token [ "=" ( token / quoted-string ) ] accept-params = weight *accept-ext acceptable-ranges = ( range-unit *( OWS "," OWS range-unit ) ) / "none" asctime-date = day-name SP date3 SP time-of-day SP year auth-param = token BWS "=" BWS ( token / quoted-string ) auth-scheme = token authority = <authority, see > challenge = auth-scheme [ 1*SP ( token68 / [ auth-param *( OWS "," OWS auth-param ) ] ) ] charset = token codings = content-coding / "identity" / "*" comment = "(" *( ctext / quoted-pair / comment ) ")" complete-length = 1*DIGIT connection-option = token content-coding = token credentials = auth-scheme [ 1*SP ( token68 / [ auth-param *( OWS "," OWS auth-param ) ] ) ] ctext = HTAB / SP / %x21-27 ; '!'-''' / %x2A-5B ; '*'-'[' / %x5D-7E ; ']'-'~' / obs-text date1 = day SP month SP year date2 = day "-" month "-" 2DIGIT date3 = month SP ( 2DIGIT / ( SP DIGIT ) ) day = 2DIGIT day-name = %x4D.6F.6E ; Mon / %x54.75.65 ; Tue / %x57.65.64 ; Wed / %x54.68.75 ; Thu / %x46.72.69 ; Fri / %x53.61.74 ; Sat / %x53.75.6E ; Sun day-name-l = %x4D.6F.6E.64.61.79 ; Monday / %x54.75.65.73.64.61.79 ; Tuesday / %x57.65.64.6E.65.73.64.61.79 ; Wednesday / %x54.68.75.72.73.64.61.79 ; Thursday / %x46.72.69.64.61.79 ; Friday / %x53.61.74.75.72.64.61.79 ; Saturday / %x53.75.6E.64.61.79 ; Sunday delay-seconds = 1*DIGIT entity-tag = [ weak ] opaque-tag etagc = "!" / %x23-7E ; '#'-'~' / obs-text expectation = token [ "=" ( token / quoted-string ) parameters ] field-content = field-vchar [ 1*( SP / HTAB / field-vchar ) field-vchar ] field-name = token field-value = *field-content field-vchar = VCHAR / obs-text first-pos = 1*DIGIT hour = 2DIGIT http-URI = "http://" authority path-abempty [ "?" query ] https-URI = "https://" authority path-abempty [ "?" query ] incl-range = first-pos "-" last-pos int-range = first-pos "-" [ last-pos ] language-range = <language-range, see > language-tag = <Language-Tag, see > last-pos = 1*DIGIT mailbox = <mailbox, see > media-range = ( "*/*" / ( type "/*" ) / ( type "/" subtype ) ) parameters media-type = type "/" subtype parameters method = token minute = 2DIGIT month = %x4A.61.6E ; Jan / %x46.65.62 ; Feb / %x4D.61.72 ; Mar / %x41.70.72 ; Apr / %x4D.61.79 ; May / %x4A.75.6E ; Jun / %x4A.75.6C ; Jul / %x41.75.67 ; Aug / %x53.65.70 ; Sep / %x4F.63.74 ; Oct / %x4E.6F.76 ; Nov / %x44.65.63 ; Dec obs-date = rfc850-date / asctime-date obs-text = %x80-FF opaque-tag = DQUOTE *etagc DQUOTE other-range = 1*( %x21-2B ; '!'-'+' / %x2D-7E ; '-'-'~' ) parameter = parameter-name "=" parameter-value parameter-name = token parameter-value = ( token / quoted-string ) parameters = *( OWS ";" OWS [ parameter ] ) partial-URI = relative-part [ "?" query ] path-abempty = <path-abempty, see > port = <port, see > product = token [ "/" product-version ] product-version = token protocol = protocol-name [ "/" protocol-version ] protocol-name = token protocol-version = token pseudonym = token qdtext = HTAB / SP / "!" / %x23-5B ; '#'-'[' / %x5D-7E ; ']'-'~' / obs-text query = <query, see > quoted-pair = "\" ( HTAB / SP / VCHAR / obs-text ) quoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE qvalue = ( "0" [ "." *3DIGIT ] ) / ( "1" [ "." *3"0" ] ) range-resp = incl-range "/" ( complete-length / "*" ) range-set = range-spec *( OWS "," OWS range-spec ) range-spec = int-range / suffix-range / other-range range-unit = token ranges-specifier = range-unit "=" range-set rank = ( "0" [ "." *3DIGIT ] ) / ( "1" [ "." *3"0" ] ) received-by = pseudonym [ ":" port ] received-protocol = [ protocol-name "/" ] protocol-version relative-part = <relative-part, see > rfc850-date = day-name-l "," SP date2 SP time-of-day SP GMT second = 2DIGIT segment = <segment, see > subtype = token suffix-length = 1*DIGIT suffix-range = "-" suffix-length t-codings = "trailers" / ( transfer-coding [ t-ranking ] ) t-ranking = OWS ";" OWS "q=" rank tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA time-of-day = hour ":" minute ":" second token = 1*tchar token68 = 1*( ALPHA / DIGIT / "-" / "." / "_" / "~" / "+" / "/" ) *"=" transfer-coding = <transfer-coding, see > type = token unsatisfied-range = "*/" complete-length uri-host = <host, see > weak = %x57.2F ; W/ weight = OWS ";" OWS "q=" qvalue year = 4DIGIT

None yet.

The sections introducing HTTP's design goals, history, architecture, conformance criteria, protocol versioning, URIs, message routing, and header fields have been moved here (without substantive change). The description of an origin and authoritative access to origin servers has been extended for both "http" and "https" URIs to account for alternative services and secured connections that are not necessarily based on TCP. (, , , ) "Field value" now refers to the value after multiple instances are combined with commas — by far the most common use. To refer to a single header line's value, use "field line value". () Parameters in media type, media range, and expectation can be empty via one or more trailing semicolons. () Trailer field semantics now transcend the specifics of chunked encoding. Use of trailer fields has been further limited to only allow generation as a trailer field when the sender knows the field defines that usage and to only allow merging into the header section if the recipient knows the corresponding field definition permits and defines how to merge. In all other cases, implementations are encouraged to either store the trailer fields separately or discard them instead of merging. () Trailer fields can now potentially appear as multiple trailer sections, if allowed by the HTTP version and framing in use, with processing described as being iterative as each section is received. () Made the priority of the absolute form of the request URI over the Host header by origin servers explicit, to align with proxy handling. () The grammar definition for the Via field's "received-by" was expanded in 7230 due to changes in the URI grammar for host that are not desirable for Via. For simplicity, we have removed uri-host from the received-by production because it can be encompassed by the existing grammar for pseudonym. In particular, this change removed comma from the allowed set of charaters for a host name in received-by. () Added status code 308 (previously defined in ) so that it's defined closer to status codes 301, 302, and 307. () Added status code 422 (previously defined in ) because of its general applicability. () The description of an origin and authoritative access to origin servers has been extended for both "http" and "https" URIs to account for alternative services and secured connections that are not necessarily based on TCP. (, , , )

Minimum URI lengths to be supported by implementations are now recommended. () Clarify that control characters in field values are to be rejected or mapped to SP. () Parameters in media type, media range, and expectation can be empty via one or more trailing semicolons. () The term "effective request URI" has been replaced with "target URI". () Range units are compared in a case insensitive fashion. () Restrictions on client retries have been loosened, to reflect implementation behavior. () Clarified that request bodies on GET and DELETE are not interoperable. (, ) Removed a superfluous requirement about setting Content-Length from the description of the OPTIONS method. () Restore list-based grammar for Expect for compatibility with RFC 2616. () Allow Accept and Accept-Encoding in response messages; the latter was introduced by . () The process of creating a redirected request has been clarified. () The semantics of "*" in the Vary header field when other values are present was clarified. ()

Preconditions can now be evaluated before the request body is processed rather than waiting until the response would otherwise be successful. () Removed edge case requirement on If-Match and If-Unmodified-Since that a validator not be sent in a 2xx response when validation fails and the server decides that the same change request has already been applied. ( and ) Clarified that If-Unmodified-Since doesn't apply to a resource without a concept of modification time. ()

Refactored the range-unit and ranges-specifier grammars to simplify and reduce artificial distinctions between bytes and other (extension) range units, removing the overlapping grammar of other-range-unit by defining range units generically as a token and placing extensions within the scope of a range-spec (other-range). This disambiguates the role of list syntax (commas) in all range sets, including extension range units, for indicating a range-set of more than one range. Moving the extension grammar into range specifiers also allows protocol specific to byte ranges to be specified separately.

None yet.

None yet.

None yet.

This specification includes the extension defined in , but leaves out examples and deployment considerations.

The changes were purely editorial:

• Change boilerplate and abstract to indicate the "draft" status, and update references to ancestor specifications.
• Remove version "1.1" from document title, indicating that this specification applies to all HTTP versions.
• Adjust historical notes.
• Update links to sibling specifications.
• Replace sections listing changes from RFC 2616 by new empty sections referring to RFC 723x.
• Remove acknowledgements specific to RFC 723x.
• Move "Acknowledgements" to the very end and make them unnumbered.

The changes in this draft are editorial, with respect to HTTP as a whole, to merge core HTTP semantics into this document:

• Merged introduction, architecture, conformance, and ABNF extensions from RFC 7230 (Messaging).
• Rearranged architecture to extract conformance, http(s) schemes, and protocol versioning into a separate major section.
• Moved discussion of MIME differences to since that is primarily concerned with transforming 1.1 messages.
• Merged entire content of RFC 7232 (Conditional Requests).
• Merged entire content of RFC 7233 (Range Requests).
• Merged entire content of RFC 7235 (Auth Framework).
• Moved all extensibility tips, registration procedures, and registry tables from the IANA considerations to normative sections, reducing the IANA considerations to just instructions that will be removed prior to publication as an RFC.

• Improve [Welch] citation ()
• Remove HTTP/1.1-ism about Range Requests ()
• Cite RFC 8126 instead of RFC 5226 ()
• Cite RFC 7538 instead of RFC 7238 ()
• Cite RFC 8288 instead of RFC 5988 ()
• Cite RFC 8187 instead of RFC 5987 ()
• Cite RFC 7578 instead of RFC 2388 ()
• Cite RFC 7595 instead of RFC 4395 ()
• improve ABNF readability for qdtext (, )
• Clarify "resource" vs "representation" in definition of status code 416 (, )
• Resolved erratum 4072, no change needed here (, )
• Clarify DELETE status code suggestions (, )
• In , fix ABNF for "other-range-resp" to use VCHAR instead of CHAR (, )
• Resolved erratum 5162, no change needed here (, )
• Replace "response code" with "response status code" and "status-code" (the ABNF production name from the HTTP/1.1 message format) by "status code" (, )
• Added a missing word in (, )
• In , fixed an example that had trailing whitespace where it shouldn't (, )
• In , remove words that were potentially misleading with respect to the relation to the requested ranges (, )

• Included (Proxy-)Auth-Info header field definition from RFC 7615 ()
• In , clarify POST caching ()
• Add to reserve the 418 status code ()
• In and , clarified when a response can be sent ()
• In , explain the difference between the "token" production, the RFC 2978 ABNF for charset names, and the actual registration practice (, )
• In , removed the fragment component in the URI scheme definitions as per , furthermore moved fragment discussion into a separate section (, , )
• In , add language about minor HTTP version number defaulting ()
• Added for status code 422, previously defined in ()
• In , fixed prose about byte range comparison (, )
• In , explain that request/response correlation is version specific ()

• In , include status code 308 from RFC 7538 ()
• In , clarify that the charset parameter value is case-insensitive due to the definition in RFC 2046 ()
• Define a separate registry for HTTP header field names ()
• In , refactor and clarify description of wildcard ("*") handling ()
• Deprecate Accept-Charset ()
• In , mention Cache-Control: immutable ()
• In , clarify when header field combination is allowed ()
• In , instruct IANA to mark Content-MD5 as obsolete ()
• Use RFC 7405 ABNF notation for case-sensitive string constants ()
• Rework to be more version-independent ()
• In , clarify that DELETE needs to be successful to invalidate cache (, )

• In , fix field-content ABNF (, )
• Move into its own section ()
• In , reference MIME Sniffing ()
• In , simplify the #rule mapping for recipients (, )
• In , remove misleading text about "extension" of HTTP is needed to define method payloads ()
• Fix editorial issue in ()
• In , rephrase language not to use "entity" anymore, and also avoid lowercase "may" ()
• Move discussion of retries from into ()

• Moved transport-independent part of the description of trailers into ()
• Loosen requirements on retries based upon implementation behavior ()
• In , update IANA port registry for TCP/UDP on ports 80 and 443 ()
• In , revise guidelines for new header field names ()
• In , remove concept of "cacheable methods" in favor of prose (, )
• In , mention that the concept of authority can be modified by protocol extensions ()
• Create new subsection on payload body in , taken from portions of message body ()
• Moved definition of "Whitespace" into new container "Generic Syntax" ()
• In , recommend minimum URI size support for implementations ()
• In , refactored the range-unit and ranges-specifier grammars (, )
• In , caution against a request body more strongly ()
• Reorganized text in ()
• In , replace "authorize" with "fulfill" ()
• In , removed a misleading statement about Content-Length (, )
• In , add text from RFC 2818 ()
• Changed "cacheable by default" to "heuristically cacheable" throughout ()

• In , simplify received-by grammar (and disallow comma character) ()
• In , give guidance on interoperable field names ()
• In , define the semantics and possible replacement of whitespace when it is known to occur (, )
• In , introduce field terminology and distinguish between field line values and field values; use terminology consistently throughout ()
• Moved #rule definition into and whitespace into ()
• In , explicitly call out range unit names as case-insensitive, and encourage registration ()
• In , explicitly call out content codings as case-insensitive, and encourage registration ()
• In , explicitly call out field names as case-insensitive ()
• In , cite ()
• In , formally define "final" and "interim" status codes ()
• In , caution against a request body more strongly ()
• In , note that Etag can be used in trailers ()
• In , consider reserved fields as well ()
• In , be more correct about what was deprecated by RFC 3986 (, )
• In , recommend comma SP when combining field lines ()
• In , make explicit requirements on origin server to use authority from absolute-form when available ()
• In , , , and , refactored schemes to define origin and authoritative access to an origin server for both "http" and "https" URIs to account for alternative services and secured connections that are not necessarily based on TCP ()
• In , reference RFC 8174 as well ()

• In , explicitly reference the definition of representation data as including any content codings ()
• Move TE: trailers from into ()
• In , adjust requirements for handling multiple content-length values ()
• In and , clarified condition evaluation ()
• In , remove concept of obs-fold, as that is HTTP/1-specific ()
• In , introduce the concept of request payload negotiation () and define for Accept-Encoding ()
• In , , and , remove HTTP/1-specific, connection-related requirements ()
• In , correct language about what is forwarded ()
• Throughout, replace "effective request URI", "request-target" and similar with "target URI" ()
• In and , describe how extensions should consider scope of applicability ()
• In , don't rely on the HTTP/1.1 Messaging specification to define "message" ()
• In and , note that URL resolution is necessary ()
• In , explicitly reference 206 as one of the status codes that provide representation data ()
• In , refine requirements so that they don't apply to resources without a concept of modification time ()
• In , specify the scope as a request, not a target resource ()
• In , introduce concept of "complete" messages ()
• In , , and , refine use of "request target" ()
• Throughout, remove "status-line" and "request-line", as these are HTTP/1.1-specific ()

• In , remove duplicate definition of what makes a range satisfiable and refer instead to each range unit's definition ()
• In and , clarify that a selected representation of zero length can only be satisfiable as a suffix range and that a server can still ignore Range for that case ()
• In and , allow "Accept" as response field ()
• now uses the sender variant of the "#" list expansion ()
• In , make the field list-based even when "*" is present ()
• In , add optional "Comments" entry ()
• In , reserve "*" as field name ()
• In , reserve "*" as method name ()
• In and , state that multiple "*" is unlikely to be interoperable ()
• In , avoid use of obsolete media type parameter on text/html (, )
• Rephrase prose in to become version-agnostic ()
• In , instruct recipients how to deal with control characters in field values ()
• In , update note about field ABNF ()
• Add about Extending and Versioning HTTP ()
• In , include status 308 in list of heuristically cacheable status codes ()
• In , make it clearer that "identity" is not to be included ()

• Switch to xml2rfc v3 mode for draft generation ()

• In , mention compression attacks ()
• In , advise to make new content codings self-descriptive ()
• In , introduced the "parameters" ABNF rule, allowing empty parameters and trailing semicolons within media type, media range, and expectation ()
• In , explain how to create a redirected request ()
• In , defined error handling for multiple members ()
• In , revise the introduction and introduce HTTP/2 and HTTP/3 ()
• In , added a definition for Content-Length that encompasses its various roles in describing message payload or selected representation length; in , noted that Content-Length counts only the message body (not the selected representation) and that the complete length is in each Content-Range ()
• Noted that "WWW-Authenticate" with more than one value on a line is sometimes not interoperable ()
• In and , removed requirement that a validator not be sent in a 2xx response when validation fails and the server decides that the same change request has already been applied ()
• Moved requirements specific to HTTP/1.1 from to ()
• In , introduce the terms "singleton field" and "list-based field" (also - in various places - discuss what to do when a singleton field is received as a list) ()
• In , change the ABNF back to be a list of expectations, as defined in RFC 2616 ()
• In (Trailer), (Via), (Upgrade), (Connection), (Content-Encoding), (Content-Language), (Expect), (If-Match), (If-None-Match), (Accept-Charset), (Accept-Language), (Vary), (WWW-Authenticate), and (Proxy-Authenticate), adjust ABNF to allow empty lists ()
• In and , provide a more nuanced explanation of sensitive data in GET-based forms and describe workarounds ()
• In , allow preconditions to be evaluated before the request body (if any) is processed ()
• In and , allow for trailer fields in multiple trailer sections, depending on the HTTP version and framing in use, with processing being iterative as each section is received ()
• Moved definitions of "TE" and "Upgrade" from ()
• Moved 1.1-specific discussion of TLS to Messaging and rewrote to refer to RFC6125 ()
• Moved definition of "Connection" from ()

• The entire document has been reorganized, with no changes to content except editorial for the reorganization ()
• Move IANA Upgrade Token Registry instructions from ()

This edition of the HTTP specification builds on the many contributions that went into RFC 1945, RFC 2068, RFC 2145, RFC 2616, and RFC 2818, including substantial contributions made by the previous authors, editors, and Working Group Chairs: Tim Berners-Lee, , Ari Luotonen, Roy T. Fielding, Henrik Frystyk Nielsen, Jim Gettys, Jeffrey C. Mogul, Larry Masinter, Paul J. Leach, Eric Rescorla, and Yves Lafon. See for further acknowledgements from prior revisions. In addition, this document has reincorporated the HTTP Authentication Framework, previously defined in RFC 7235 and RFC 2617. We thank John Franks, Phillip M. Hallam-Baker, Jeffery L. Hostetler, Scott D. Lawrence, Paul J. Leach, Ari Luotonen, and Lawrence C. Stewart for their work on that specification. See for further acknowledgements. New acks to be added here.