HTTPbis Working GroupR. Peon
Internet-DraftGoogle, Inc
Intended status: InformationalH. Ruellan
Expires: April 24, 2014Canon CRF
October 21, 2013

HPACK - Header Compression for HTTP/2.0

draft-ietf-httpbis-header-compression-04

Abstract

This document describes HPACK, a format adapted to efficiently represent HTTP header fields in the context of HTTP/2.0.

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at http://datatracker.ietf.org/drafts/current/.

Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as “work in progress”.

This Internet-Draft will expire on April 24, 2014.

Copyright Notice

Copyright © 2013 IETF Trust and the persons identified as the document authors. All rights reserved.

This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License.

Editorial Note (To be removed by RFC Editor)

Discussion of this draft takes place on the HTTPBIS working group mailing list (ietf-http-wg@w3.org), which is archived at <http://lists.w3.org/Archives/Public/ietf-http-wg/>.

Working Group information and related documents can be found at <http://tools.ietf.org/wg/httpbis/> (Wiki) and <https://github.com/http2/http2-spec> (source code and issues tracker).

The changes in this draft are summarized in Appendix A.1.


1. Introduction

This document describes HPACK, a format adapted to efficiently represent HTTP header fields in the context of HTTP/2.0 (see [HTTP2]).

2. Overview

In HTTP/1.X (see [HTTP-p1]), header fields are sent without any form of compression. As web pages have grown to include dozens to hundreds of requests, the redundant header fields in these requests now pose a problem of measurable latency and unnecessary bandwidth (see [PERF1] and [PERF2]).

SPDY [SPDY] initially addressed this redundancy by compressing header fields with Deflate, which proved very effective at eliminating the redundant header fields. However, that aproach exposed a security risk as demonstrated by the CRIME [CRIME].

In this document, we propose a new compressor for header fields which eliminates redundant header fields, is not vulnerable to CRIME style attacks, and which also has a bounded memory cost for use in constrained environments.

2.1. Outline

The HTTP header field encoding described in this document is based on a header table that map (name, value) pairs to index values. Header tables are incrementally updated during the HTTP/2.0 session.

The encoder is responsible for deciding which header fields to insert as new entries in the header table. The decoder then does exactly what the encoder prescribes, ending in a state that exactly matches the encoder's state. This enables decoders to remain simple and understand a wide variety of encoders.

As two consecutive sets of header fields often have header fields in common, each set of header fields is coded as a difference from the previous set of header fields. The goal is to only encode the changes (header fields present in one of the set and not in the other) between the two sets of header fields.

Examples illustrating the use of these different mechanisms to represent header fields are available in Appendix E.

3. Header Field Encoding

3.1. Encoding Concepts

The encoding and decoding of header fields relies on some components and concepts:

Header Field:
A key, value pair. HPACK allows a header field value to be either a value as specified by HTTP/1.X (see [HTTP-p1]), or a NULL-separated ordered list of HTTP/1.X values.
Header Table:
The header table (see Section 3.1.2) is a component used to associate stored header fields to index values. The data stored in this table is in first-in, first-out order.
Static Table:
The static table (see Appendix B) is a component used to associate static header fields to index values. This data is ordered, read-only, always accessible, and may be shared amongst all encoding contexts.
Reference Set:
The reference set (see Section 3.1.3) is a component containing an unordered set of references to entries in the header table or static table. This is used for the differential encoding of a new header set.
Header Set:
A header set is a potentially ordered group of header fields that are encoded jointly. A complete set of key-value pairs contained in a HTTP request or response is a header set.
Header Field Representation:
A header field can be represented in encoded form either as a literal or as an index (see Section 3.1.4).
Header Block:
The entire set of encoded header field representations which, when decoded, yield a complete header set.
Header Field Emission:
When decoding a set of header field representations, some operations emit a header field (see Section 3.1.5). Emitted headers can be safely passed to the upper processing layers as part of the current Header Set.

3.1.1. Encoding Context

The set of mutable structures used within an encoding context include a header table and a reference set. Everything else is either immutable or conceptual.

Using HTTP, messages are exchanged between a client and a server in both direction. To keep the encoding of header fields in each direction independent from the other direction, there is one encoding context for each direction.

The header fields contained in a PUSH_PROMISE frame sent by a server to a client are encoded within the same context as the header fields contained in the HEADERS frame corresponding to a response sent from the server to the client.

3.1.2. Header Table

A header table consists of a list of header fields maintained in first-in, first-out order. The first and newest entry in a header table is always at index 0, and the oldest entry of a header table is at the index len(header table)-1.

The header table is initially empty.

There is typically no need for the header table to contain duplicate entries. However, duplicate entries MUST NOT be treated as an error by a decoder.

The encoder decides how to update the header table and as such can control how much memory is used by the header table. To limit the memory requirements on the decoder side, the header table size is strictly bounded (see Section 3.3.1).

The header table is updated during the processing of a set of header field representations (see header field representation processing (Section 3.2.1).

3.1.3. Reference Set

A reference set is an unordered set of references to entries either within the header table or the static table.

The reference set is initially empty.

The reference set is updated during the processing of a set of header field representations (see header field representation processing (Section 3.2.1).

The reference set enables differential encoding, whereby only differences between the previous header set and the current header set need to be encoded.

When an entry is evicted from the header table, if it was referenced from the reference set, its reference is removed from the reference set.

3.1.4. Header Field Representation

An encoded header field can be represented either as a literal or as an index.

Literal Representation:
A literal representation defines a new header field. The header field name is represented either literally or as a reference to an entry of the header table. The header field value is represented literally.
Two different literal representations are provided:
  • A literal representation that does not add the header field to the header table (see Section 4.3.1).
  • A literal representation that adds the header field as a new entry at the beginning of the header table (see Section 4.3.2).
Indexed Representation:
The indexed representation defines a header field as a reference to an entry in either the header table or the static table(see Section 4.2).
                                        
       <----------  Index Address Space ---------->
       <-- Header  Table -->  <-- Static  Table -->
       +---+-----------+---+  +---+-----------+---+
       | 0 |    ...    | k |  |k+1|    ...    | n |
       +---+-----------+---+  +---+-----------+---+
       ^                   |
       |                   V
Insertion Point       Drop Point

                                    

Index Address Space

<list>
  • Indices between 0 and len(header table)-1, inclusive, refer to elements in the header table, with index 0 referring to the beginning of the table.
  • Indices between len(header table) and len(header table)+len(static table)-1, inclusive, refer to elements in the static table, where the index len(header table) refers to the first entry in the static table.
  • Any other indices MUST be treated as erroneous, and the compression context considered corrupt and unusable.
  • </list>

    3.1.5. Header Field Emission

    The emission of a header field is the process of passing that header field to the application, so that the application can process and react to header field data.

    By emitting header fields instead of emitting header sets, the decoder can be implemented in a streaming way, and as such must only keep in memory the header table and the reference set. This bounds the amount of memory used by the decoder, even in presence of a very large set of header fields. The management of memory for handling very large sets of header fields can therefore be deferred to the application.

    When a header field is a NULL-separated list of values, each value within the list MAY be emitted separately, with the same header field name, and the order of emission MUST be the order of appearance in the list.

    3.2. Header Block Decoding

    The processing of a header block to obtain a header set is defined in this section. To ensure that the decoding will successfully produce a header set, a decoder MUST obey the following rules.

    3.2.1. Header Field Representation Processing

    All the header field representations contained in a header block are processed in the order in which they are presented, as specified below.

    An indexed representation corresponding to an entry present in the reference set entails the following actions:

    • The reference to the entry is removed from the reference set.

    An indexed representation corresponding to an entry not present in the reference set entails the following actions:

    • If referencing an element of the static table:
      • The header field corresponding to the referenced entry is emitted.
      • The referenced static entry is added to the header table.
      • If the new entry fits within the header table, a reference to the header table entry is added to the reference set.
    • If referencing an element of the header table:
      • The header field corresponding to the referenced entry is emitted.
      • The referenced header table entry is added to the header table.

    A literal representation that is not added to the header table entails the following action:

    • The header field is emitted.

    A literal representation that is added to the header table entails the following actions:

    • The header field is inserted at the beginning of the header table.
    • A reference to the new entry is added to the reference set.
    • The header field is emitted.

    3.2.2. Reference Set Emission

    Once all the representations contained in a header block have been processed, the header fields referenced in the reference set which have not previously been emitted during this processing are emitted.

    3.2.3. Header Set Completion

    Once all of the header field representations have been processed, and the remaining items in the reference set have been emitted, the header set is complete.

    3.3. Header Table Management

    3.3.1. Maximum Table Size

    To limit the memory requirements on the decoder side, the size of the the header table is bounded. The size of the header table MUST stay lower than or equal to the value of the HTTP/2.0 setting SETTINGS_HEADER_TABLE_SIZE (see [HTTP2]).

    The size of the the header table is the sum of the size of its entries.

    The size of an entry is the sum of its name's length in bytes (as defined in Section 4.1.2), of its value's length in bytes (Section 4.1.2) and of 32 bytes.

    The lengths are measured on the non-encoded entry name and entry value (for the case when a Huffman encoding is used to transmit string values).

    The 32 bytes are an accounting for the entry structure overhead. For example, an entry structure using two 64-bits pointers to reference the name and the value and the entry, and two 64-bits integer for counting the number of references to these name and value would use 32 bytes.

    3.3.2. Entry Eviction When Header Table Size Changes

    Whenever an entry is evicted from the header table, any reference to that entry contained by the reference set is removed.

    Whenever SETTINGS_HEADER_TABLE_SIZE is made smaller, entries are evicted from the end of the header table until the size of the header table is less than or equal to SETTINGS_HEADER_TABLE_SIZE.

    The eviction of an entry from the header table causes the index of the entries in the static table to be reduced by one.

    3.3.3. Entry Eviction when Adding New Entries

    Whenever a new entry is to be added to the table, any name referenced by the representation is cached, and then entries are evicted from the end of the header table until the size of the header table is less than or equal to SETTINGS_HEADER_TABLE_SIZE - new entry size, or until the table is empty.

    If the size of the new entry is less than or equal to SETTINGS_HEADER_TABLE_SIZE, that entry is added to the table. It is not an error to attempt to add an entry that is larger than SETTINGS_HEADER_TABLE_SIZE.

    4. Detailed Format

    4.1. Low-level representations

    4.1.1. Integer representation

    Integers are used to represent name indexes, pair indexes or string lengths. To allow for optimized processing, an integer representation always finishes at the end of a byte.

    An integer is represented in two parts: a prefix that fills the current byte and an optional list of bytes that are used if the integer value does not fit within the prefix. The number of bits of the prefix (called N) is a parameter of the integer representation.

    The N-bit prefix allows filling the current byte. If the value is small enough (strictly less than 2N-1), it is encoded within the N-bit prefix. Otherwise all the bits of the prefix are set to 1 and the value is encoded using an unsigned variable length integer representation. N is always between 1 and 8 bits. An integer starting at a byte-boundary will have an 8-bit prefix.

    The algorithm to represent an integer I is as follows:

    If I < 2^N - 1, encode I on N bits
    Else
        encode 2^N - 1 on N bits
        I = I - (2^N - 1)
        While I >= 128
             Encode (I % 128 + 128) on 8 bits
             I = I / 128
        encode (I) on 8 bits
    

    This integer representation allows for values of indefinite size. It is also possible for an encoder to send a large number of zero values, which can waste bytes and could be used to overflow integer values. Excessively large integer encodings - in value or octet length - MUST be treated as a decoding error. Different limits can be set for each of the different uses of integers, based on implementation constraints.

    4.1.1.1. Example 1: Encoding 10 using a 5-bit prefix

    The value 10 is to be encoded with a 5-bit prefix.

    • 10 is less than 31 (= 25 - 1) and is represented using the 5-bit prefix.
      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    | X | X | X | 0 | 1 | 0 | 1 | 0 |   10 stored on 5 bits
    +---+---+---+---+---+---+---+---+
    
    4.1.1.2. Example 2: Encoding 1337 using a 5-bit prefix

    The value I=1337 is to be encoded with a 5-bit prefix.

    • 1337 is greater than 31 (= 25 - 1).
      • The 5-bit prefix is filled with its max value (31).
    • I = 1337 - (25 - 1) = 1306.
      • I (1306) is greater than or equal to 128, the while loop body executes:
        • I % 128 == 26
        • 26 + 128 == 154
        • 154 is encoded in 8 bits as: 10011010
        • I is set to 10 (1306 / 128 == 10)
        • I is no longer greater than or equal to 128, the while loop terminates.
      • I, now 10, is encoded on 8 bits as: 00001010
    • The process ends.
      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    | X | X | X | 1 | 1 | 1 | 1 | 1 |  Prefix = 31, I = 1306
    | 1 | 0 | 0 | 1 | 1 | 0 | 1 | 0 |  1306>=128, encode(154), I=1306/128
    | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 |  10<128, encode(10), done
    +---+---+---+---+---+---+---+---+
    

    4.1.2. String Literal Representation

    Header field names and header field values are encoded as sequences of bytes. A header field name or a header field value is encoded in three parts:

    1. One bit, H, indicating whether or not the bytes are huffman encoded.
    2. The number of bytes required to hold the result of the next step, represented as a variable-length-quantity (Section 4.1.1), starting with a 7-bit prefix immediately following the first bit.
    3. The encoded data of the string:
      1. If H is true, then the the encoded string data is the bitwise concatenation of the canonical [CANON]huffman code [HUFF] corresponding to each character of the data, followed by between 0-7 bits of padding.
      2. If H is false, then the encoded string is the bytes of the field value without modification.

    Padding is necessary when doing huffman encoding to ensure that the remaining bits between the actual end of the data and the next byte boundary are not misinterpreted as part of the input data.

    When padding for huffman encoding, use the bits from the EOS (end-of-string) entry in the Huffman table, starting with the MSB. This entry is guaranteed to be at least 8 bits long.

    String literals sent in the client to server direction which use huffman encoding are encoded with the codes within the request huffman code table (Appendix C) (see Request Decoding With Huffman Example (Appendix E.3)).

    String literals sent in the server to client direction which use huffman encoding are encoded with the codes within the response huffman code table (Appendix D) (see Response Decoding With Huffman Example (Appendix E.3)).

    The EOS symbol is represented with value 256, and is used solely to signal the end of the huffman-encoded key data or the end of the huffman-encoded value data. Given that only between 0-7 bits of the EOS symbol is included in any huffman-encoded string, and given that the EOS symbol is at least 8 bits long, it is expected that it should never be successfully decoded.

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    | 1 |  Value Length Prefix (7)  |
    +---+---+---+---+---+---+---+---+
    |   Value Length (0-N bytes)    |
    +---+---+---+---+---+---+---+---+
    ...
    +---+---+---+---+---+---+---+---+
    | Huffman Encoded Data  |Padding|
    +---+---+---+---+---+---+---+---+
    

    String Literal With Huffman Encoding

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    | 0 |  Value Length Prefix (7)  |
    +---+---+---+---+---+---+---+---+
    |   Value Length (0-N bytes)    |
    +---+---+---+---+---+---+---+---+
    ...
    +---+---+---+---+---+---+---+---+
    |  Field Bytes Without Encoding |
    +---+---+---+---+---+---+---+---+
    

    String Literal Without Huffman Encoding

    4.2. Indexed Header Field Representation

    An indexed header field representation either identifies an entry in the header table or static table. The specified entry is emitted and a reference to that entry is added to the reference set if it is not currently in the reference set. If it is present in the reference set then the reference is removed and the entry is not emitted.

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    | 1 |        Index (7+)         |
    +---+---------------------------+
    

    Indexed Header Field

    This representation starts with the '1' 1-bit pattern, followed by the index of the matching pair, represented as an integer with a 7-bit prefix.

    4.3. Literal Header Field Representation

    Literal header field representations contain a literal header field value. Header field names are either provided as a literal or by reference to an existing header table or static table entry.

    Literal representations all result in the emission of a header field when decoded.

    4.3.1. Literal Header Field without Indexing

    A literal header field without indexing causes the emission of a header field without altering the header table.

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    | 0 | 1 |      Index (6+)       |
    +---+---+---+-------------------+
    |       Value Length (8+)       |
    +-------------------------------+
    | Value String (Length octets)  |
    +-------------------------------+
    

    Literal Header Field without Indexing - Indexed Name

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    | 0 | 1 |           0           |
    +---+---+---+-------------------+
    |       Name Length (8+)        |
    +-------------------------------+
    |  Name String (Length octets)  |
    +-------------------------------+
    |       Value Length (8+)       |
    +-------------------------------+
    | Value String (Length octets)  |
    +-------------------------------+
    

    Literal Header Field without Indexing - New Name

    This representation starts with the '01' 2-bit pattern.

    If the header field name matches the header field name of a (name, value) pair stored in the Header Table or Static Table, the index of that entry, increased by one (index + 1), is represented as an integer with a 6-bit prefix. Note that if the index is strictly below 63, only one byte is used for this representation.

    If the header field name does not match a header field name entry, the value 0 is represented on 6 bits followed by the header field name (Section 4.1.2).

    The header field name representation is followed by the header field value represented as a literal string as described in Section 4.1.2.

    4.3.2. Literal Header Field with Incremental Indexing

    A literal header field with incremental indexing adds a new entry to the header table.

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    | 0 | 0 |      Index (6+)       |
    +---+---+---+-------------------+
    |       Value Length (8+)       |
    +-------------------------------+
    | Value String (Length octets)  |
    +-------------------------------+
    

    Literal Header Field with Incremental Indexing - Indexed Name

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    | 0 | 0 |           0           |
    +---+---+---+-------------------+
    |       Name Length (8+)        |
    +-------------------------------+
    |  Name String (Length octets)  |
    +-------------------------------+
    |       Value Length (8+)       |
    +-------------------------------+
    | Value String (Length octets)  |
    +-------------------------------+
    

    Literal Header Field with Incremental Indexing - New Name

    This representation starts with the '00' 2-bit pattern.

    If the header field name matches the header field name of a (name, value) pair stored in the header table or static table, the index of the pair increased by one (index + 1) is represented as an integer with a 6-bit prefix.

    If the header field name does not match a header field name entry, the value 0 is represented on 6 bits followed by the header field name (Section 4.1.2).

    The header field name representation is followed by the header field value represented as a literal string as described in Section 4.1.2.

    5. Security Considerations

    This compressor exists to solve security issues present in stream compressors such as DEFLATE whereby the compression context can be efficiently probed to reveal secrets. A conformant implementation of this specification should be fairly safe against that kind of attack, as the reaping of any information from the compression context requires more work than guessing and verifying the plaintext data directly with the server. As with any secret, however, the longer the length of the secret, the more difficult the secret is to guess. It is inadvisable to have short cookies that are relied upon to remain secret for any duration of time.

    A proper security-conscious implementation will also need to prevent timing attacks by ensuring that the amount of time it takes to do string comparisons is always a function of the total length of the strings, and not a function of the number of matched characters.

    A decoder needs to ensure that larger values or encodings of integers do not permit exploitation. Decoders MUST limit the size of integers, both in value and encoded length, that it accepts (see Section 4.1.1).

    Another common security problem is when the remote endpoint successfully causes the local endpoint to exhaust its memory. This compressor attempts to deal with the most obvious ways that this could occur by limiting both the peak and the steady-state amount of memory consumed in the compressor state, by providing ways for the application to consume/flush the emitted header fields in small chunks, and by considering overhead in the state size calculation. Implementors must still be careful in the creation of APIs to an implementation of this compressor by ensuring that header field keys and values are either emitted as a stream, or that the compression implementation have a limit on the maximum size of a key or value. Failure to implement these kinds of safeguards may still result in a scenario where the local endpoint exhausts its memory.

    6. References

    6.1. Normative References

    [HTTP-p1]
    Fielding, R., Ed. and J. Reschke, Ed., “Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing”, Internet-Draft draft-ietf-httpbis-p1-messaging-24 (work in progress), September 2013.
    [HTTP2]
    Belshe, M., Peon, R., Thomson, M., and A. Melnikov, “Hypertext Transfer Protocol version 2.0”, Internet-Draft draft-ietf-httpbis-http2-06 (work in progress), August 2013.

    6.2. Informative References

    [CANON]
    Schwartz, E. and B. Kallick, “Generating a canonical prefix encoding”, Communications of the ACM Volume 7 Issue 3, pp. 166-169, March 1964, <http://dl.acm.org/citation.cfm?id=363991>.
    [CRIME]
    Rizzo, J. and T. Duong, “The Crime Attack”, September 2012, <https://docs.google.com/a/twist.com/presentation/d/11eBmGiHbYcHR9gL5nDyZChu_-lCa2GizeuOfaLU2HOU/edit#slide=id.g1eb6c1b5_3_6>.
    [HUFF]
    Huffman, D., “A Method for the Construction of Minimim Redundancy Codes”, Proceedings of the Institute of Radio Engineers Volume 40, Number 9, pp. 1098-1101, September 1952, <http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4051119>.
    [PERF1]
    Belshe, M., “IETF83: SPDY and What to Consider for HTTP/2.0”, March 2012, <http://www.ietf.org/proceedings/83/slides/slides-83-httpbis-3>.
    [PERF2]
    McManus, P., “SPDY: What I Like About You”, September 2011, <http://bitsup.blogspot.com/2011/09/spdy-what-i-like-about-you.html>.
    [SPDY]
    Belshe, M. and R. Peon, “SPDY Protocol”, Internet-Draft draft-mbelshe-httpbis-spdy-00 (work in progress), February 2012.

    A. Change Log (to be removed by RFC Editor before publication

    A.1. Since draft-ietf-httpbis-header-compression-03

    • A large number of editorial changes; changed the description of evicting/adding new entries.
    • Removed substitution indexing
    • Changed 'initial headers' to 'static headers', as per issue #258
    • Merged 'request' and 'response' static headers, as per issue #259
    • Changed text to indicate that new headers are added at index 0 and expire from the largest index, as per issue #233

    A.2. Since draft-ietf-httpbis-header-compression-02

    • Corrected error in integer encoding pseudocode.

    A.3. Since draft-ietf-httpbis-header-compression-01

    • Refactored of Header Encoding Section: split definitions and processing rule.
    • Backward incompatible change: Updated reference set management as per issue #214. This changes how the interaction between the reference set and eviction works. This also changes the working of the reference set in some specific cases.
    • Backward incompatible change: modified initial header list, as per issue #188.
    • Added example of 32 bytes entry structure (issue #191).
    • Added Header Set Completion section. Reflowed some text. Clarified some writing which was akward. Added text about duplicate header entry encoding. Clarified some language w.r.t Header Set. Changed x-my-header to mynewheader. Added text in the HeaderEmission section indicating that the application may also be able to free up memory more quickly. Added information in Security Considerations section.

    A.4. Since draft-ietf-httpbis-header-compression-01

    • Fixed bug/omission in integer representation algorithm.
    • Changed the document title.
    • Header matching text rewritten.
    • Changed the definition of header emission.
    • Changed the name of the setting which dictates how much memory the compression context should use.
    • Removed "specific use cases" section
    • Corrected erroneous statement about what index can be contained in one byte
    • Added descriptions of opcodes
    • Removed security claims from introduction.

    B. Static Table

    The static table consists of an unchangable ordered list of (name, value) pairs. The first entry in the table is always represented by the index len(header table), and the last entry in the table is represented by the index len(header table)+len(static table)-1.

    [rfc.comment.1: The ordering of these tables is currently arbitrary. The tables in this section should be updated and ordered such that the table entries with the smallest indices are those which, based on a statistical analysis of the frequency of use weighted by size, achieve the largest decrease in bytes transmitted subject to HTTP 2.0 header field rules (like removal of some header fields). This set of header fields is currently very likely incomplete, and should be made complete.]

    The following table lists the pre-defined header fields that make-up the static header table.

    Table 1: Static Table Entries
    IndexHeader NameHeader Value
    0:authority
    1:methodGET
    2:methodPOST
    3:path/
    4:path/index.html
    5:schemehttp
    6:schemehttps
    7:status200
    8:status500
    9:status404
    10:status403
    11:status400
    12:status401
    13accept-charset
    14accept-encoding
    15accept-language
    16accept-ranges
    17accept
    18access-control-allow-origin
    19age
    20allow
    21authorization
    22cache-control
    23content-disposition
    24content-encoding
    25content-language
    26content-length
    27content-location
    28content-range
    29content-type
    30cookie
    31date
    32etag
    33expect
    34expires
    35from
    36if-match
    37if-modified-since
    38if-none-match
    39if-range
    40if-unmodified-since
    41last-modified
    42link
    43location
    44max-forwards
    45proxy-authenticate
    46proxy-authorization
    47range
    48referer
    49refresh
    50retry-after
    51server
    52set-cookie
    53strict-transport-security
    54transfer-encoding
    55user-agent
    56vary
    57via
    58www-authenticate

    The table give the index of each entry in the static table. The full index of each entry, to be used for encoding a reference to this entry, is computed by adding the number of entries in the header table to this index.

    C. Huffman Codes For Requests

    The following Huffman codes are used when encoding string literals in the client to server direction.

    [rfc.comment.2: This table is out of date and needs updating. In particular, EOS needs to be at least 7-bits long and currently is not.]

                 aligned                                  aligned
                  to                            len        to     len
                  MSB                            in        LSB     in
           sym    as bits                       bits      as hex  bits
          (  0) |11111111|11111111|11110111|010 [27]      7ffffba [27]
          (  1) |11111111|11111111|11110111|011 [27]      7ffffbb [27]
          (  2) |11111111|11111111|11110111|100 [27]      7ffffbc [27]
          (  3) |11111111|11111111|11110111|101 [27]      7ffffbd [27]
          (  4) |11111111|11111111|11110111|110 [27]      7ffffbe [27]
          (  5) |11111111|11111111|11110111|111 [27]      7ffffbf [27]
          (  6) |11111111|11111111|11111000|000 [27]      7ffffc0 [27]
          (  7) |11111111|11111111|11111000|001 [27]      7ffffc1 [27]
          (  8) |11111111|11111111|11111000|010 [27]      7ffffc2 [27]
          (  9) |11111111|11111111|11111000|011 [27]      7ffffc3 [27]
          ( 10) |11111111|11111111|11111000|100 [27]      7ffffc4 [27]
          ( 11) |11111111|11111111|11111000|101 [27]      7ffffc5 [27]
          ( 12) |11111111|11111111|11111000|110 [27]      7ffffc6 [27]
          ( 13) |11111111|11111111|11111000|111 [27]      7ffffc7 [27]
          ( 14) |11111111|11111111|11111001|000 [27]      7ffffc8 [27]
          ( 15) |11111111|11111111|11111001|001 [27]      7ffffc9 [27]
          ( 16) |11111111|11111111|11111001|010 [27]      7ffffca [27]
          ( 17) |11111111|11111111|11111001|011 [27]      7ffffcb [27]
          ( 18) |11111111|11111111|11111001|100 [27]      7ffffcc [27]
          ( 19) |11111111|11111111|11111001|101 [27]      7ffffcd [27]
          ( 20) |11111111|11111111|11111001|110 [27]      7ffffce [27]
          ( 21) |11111111|11111111|11111001|111 [27]      7ffffcf [27]
          ( 22) |11111111|11111111|11111010|000 [27]      7ffffd0 [27]
          ( 23) |11111111|11111111|11111010|001 [27]      7ffffd1 [27]
          ( 24) |11111111|11111111|11111010|010 [27]      7ffffd2 [27]
          ( 25) |11111111|11111111|11111010|011 [27]      7ffffd3 [27]
          ( 26) |11111111|11111111|11111010|100 [27]      7ffffd4 [27]
          ( 27) |11111111|11111111|11111010|101 [27]      7ffffd5 [27]
          ( 28) |11111111|11111111|11111010|110 [27]      7ffffd6 [27]
          ( 29) |11111111|11111111|11111010|111 [27]      7ffffd7 [27]
          ( 30) |11111111|11111111|11111011|000 [27]      7ffffd8 [27]
          ( 31) |11111111|11111111|11111011|001 [27]      7ffffd9 [27]
      ' ' ( 32) |11101000| [8]                                  e8 [8]
      '!' ( 33) |11111111|1100 [12]                           ffc [12]
      '"' ( 34) |11111111|111010 [14]                        3ffa [14]
      '#' ( 35) |11111111|1111100 [15]                       7ffc [15]
      '$' ( 36) |11111111|1111101 [15]                       7ffd [15]
      '%' ( 37) |100100 [6]                                     24 [6]
      '&' ( 38) |1101110 [7]                                    6e [7]
      ''' ( 39) |11111111|1111110 [15]                       7ffe [15]
      '(' ( 40) |11111111|010 [11]                            7fa [11]
      ')' ( 41) |11111111|011 [11]                            7fb [11]
      '*' ( 42) |11111110|10 [10]                             3fa [10]
      '+' ( 43) |11111111|100 [11]                            7fc [11]
      ',' ( 44) |11101001| [8]                                  e9 [8]
      '-' ( 45) |100101 [6]                                     25 [6]
      '.' ( 46) |00100 [5]                                       4 [5]
      '/' ( 47) |0000 [4]                                        0 [4]
      '0' ( 48) |00101 [5]                                       5 [5]
      '1' ( 49) |00110 [5]                                       6 [5]
      '2' ( 50) |00111 [5]                                       7 [5]
      '3' ( 51) |100110 [6]                                     26 [6]
      '4' ( 52) |100111 [6]                                     27 [6]
      '5' ( 53) |101000 [6]                                     28 [6]
      '6' ( 54) |101001 [6]                                     29 [6]
      '7' ( 55) |101010 [6]                                     2a [6]
      '8' ( 56) |101011 [6]                                     2b [6]
      '9' ( 57) |101100 [6]                                     2c [6]
      ':' ( 58) |11110110|0 [9]                                1ec [9]
      ';' ( 59) |11101010| [8]                                  ea [8]
      '<' ( 60) |11111111|11111111|10 [18]                  3fffe [18]
      '=' ( 61) |101101 [6]                                     2d [6]
      '>' ( 62) |11111111|11111110|0 [17]                   1fffc [17]
      '?' ( 63) |11110110|1 [9]                                1ed [9]
      '@' ( 64) |11111111|111011 [14]                        3ffb [14]
      'A' ( 65) |1101111 [7]                                    6f [7]
      'B' ( 66) |11101011| [8]                                  eb [8]
      'C' ( 67) |11101100| [8]                                  ec [8]
      'D' ( 68) |11101101| [8]                                  ed [8]
      'E' ( 69) |11101110| [8]                                  ee [8]
      'F' ( 70) |1110000 [7]                                    70 [7]
      'G' ( 71) |11110111|0 [9]                                1ee [9]
      'H' ( 72) |11110111|1 [9]                                1ef [9]
      'I' ( 73) |11111000|0 [9]                                1f0 [9]
      'J' ( 74) |11111000|1 [9]                                1f1 [9]
      'K' ( 75) |11111110|11 [10]                             3fb [10]
      'L' ( 76) |11111001|0 [9]                                1f2 [9]
      'M' ( 77) |11101111| [8]                                  ef [8]
      'N' ( 78) |11111001|1 [9]                                1f3 [9]
      'O' ( 79) |11111010|0 [9]                                1f4 [9]
      'P' ( 80) |11111010|1 [9]                                1f5 [9]
      'Q' ( 81) |11111011|0 [9]                                1f6 [9]
      'R' ( 82) |11111011|1 [9]                                1f7 [9]
      'S' ( 83) |11110000| [8]                                  f0 [8]
      'T' ( 84) |11110001| [8]                                  f1 [8]
      'U' ( 85) |11111100|0 [9]                                1f8 [9]
      'V' ( 86) |11111100|1 [9]                                1f9 [9]
      'W' ( 87) |11111101|0 [9]                                1fa [9]
      'X' ( 88) |11111101|1 [9]                                1fb [9]
      'Y' ( 89) |11111110|0 [9]                                1fc [9]
      'Z' ( 90) |11111111|00 [10]                             3fc [10]
      '[' ( 91) |11111111|111100 [14]                        3ffc [14]
      '\' ( 92) |11111111|11111111|11111011|010 [27]      7ffffda [27]
      ']' ( 93) |11111111|11100 [13]                         1ffc [13]
      '^' ( 94) |11111111|111101 [14]                        3ffd [14]
      '_' ( 95) |101110 [6]                                     2e [6]
      '`' ( 96) |11111111|11111111|110 [19]                 7fffe [19]
      'a' ( 97) |01000 [5]                                       8 [5]
      'b' ( 98) |101111 [6]                                     2f [6]
      'c' ( 99) |01001 [5]                                       9 [5]
      'd' (100) |110000 [6]                                     30 [6]
      'e' (101) |0001 [4]                                        1 [4]
      'f' (102) |110001 [6]                                     31 [6]
      'g' (103) |110010 [6]                                     32 [6]
      'h' (104) |110011 [6]                                     33 [6]
      'i' (105) |01010 [5]                                       a [5]
      'j' (106) |1110001 [7]                                    71 [7]
      'k' (107) |1110010 [7]                                    72 [7]
      'l' (108) |01011 [5]                                       b [5]
      'm' (109) |110100 [6]                                     34 [6]
      'n' (110) |01100 [5]                                       c [5]
      'o' (111) |01101 [5]                                       d [5]
      'p' (112) |01110 [5]                                       e [5]
      'q' (113) |11110010| [8]                                  f2 [8]
      'r' (114) |01111 [5]                                       f [5]
      's' (115) |10000 [5]                                      10 [5]
      't' (116) |10001 [5]                                      11 [5]
      'u' (117) |110101 [6]                                     35 [6]
      'v' (118) |1110011 [7]                                    73 [7]
      'w' (119) |110110 [6]                                     36 [6]
      'x' (120) |11110011| [8]                                  f3 [8]
      'y' (121) |11110100| [8]                                  f4 [8]
      'z' (122) |11110101| [8]                                  f5 [8]
      '{' (123) |11111111|11111110|1 [17]                   1fffd [17]
      '|' (124) |11111111|101 [11]                            7fd [11]
      '}' (125) |11111111|11111111|0 [17]                   1fffe [17]
      '~' (126) |11111111|1101 [12]                           ffd [12]
          (127) |11111111|11111111|11111011|011 [27]      7ffffdb [27]
          (128) |11111111|11111111|11111011|100 [27]      7ffffdc [27]
          (129) |11111111|11111111|11111011|101 [27]      7ffffdd [27]
          (130) |11111111|11111111|11111011|110 [27]      7ffffde [27]
          (131) |11111111|11111111|11111011|111 [27]      7ffffdf [27]
          (132) |11111111|11111111|11111100|000 [27]      7ffffe0 [27]
          (133) |11111111|11111111|11111100|001 [27]      7ffffe1 [27]
          (134) |11111111|11111111|11111100|010 [27]      7ffffe2 [27]
          (135) |11111111|11111111|11111100|011 [27]      7ffffe3 [27]
          (136) |11111111|11111111|11111100|100 [27]      7ffffe4 [27]
          (137) |11111111|11111111|11111100|101 [27]      7ffffe5 [27]
          (138) |11111111|11111111|11111100|110 [27]      7ffffe6 [27]
          (139) |11111111|11111111|11111100|111 [27]      7ffffe7 [27]
          (140) |11111111|11111111|11111101|000 [27]      7ffffe8 [27]
          (141) |11111111|11111111|11111101|001 [27]      7ffffe9 [27]
          (142) |11111111|11111111|11111101|010 [27]      7ffffea [27]
          (143) |11111111|11111111|11111101|011 [27]      7ffffeb [27]
          (144) |11111111|11111111|11111101|100 [27]      7ffffec [27]
          (145) |11111111|11111111|11111101|101 [27]      7ffffed [27]
          (146) |11111111|11111111|11111101|110 [27]      7ffffee [27]
          (147) |11111111|11111111|11111101|111 [27]      7ffffef [27]
          (148) |11111111|11111111|11111110|000 [27]      7fffff0 [27]
          (149) |11111111|11111111|11111110|001 [27]      7fffff1 [27]
          (150) |11111111|11111111|11111110|010 [27]      7fffff2 [27]
          (151) |11111111|11111111|11111110|011 [27]      7fffff3 [27]
          (152) |11111111|11111111|11111110|100 [27]      7fffff4 [27]
          (153) |11111111|11111111|11111110|101 [27]      7fffff5 [27]
          (154) |11111111|11111111|11111110|110 [27]      7fffff6 [27]
          (155) |11111111|11111111|11111110|111 [27]      7fffff7 [27]
          (156) |11111111|11111111|11111111|000 [27]      7fffff8 [27]
          (157) |11111111|11111111|11111111|001 [27]      7fffff9 [27]
          (158) |11111111|11111111|11111111|010 [27]      7fffffa [27]
          (159) |11111111|11111111|11111111|011 [27]      7fffffb [27]
          (160) |11111111|11111111|11111111|100 [27]      7fffffc [27]
          (161) |11111111|11111111|11111111|101 [27]      7fffffd [27]
          (162) |11111111|11111111|11111111|110 [27]      7fffffe [27]
          (163) |11111111|11111111|11111111|111 [27]      7ffffff [27]
          (164) |11111111|11111111|11100000|00 [26]       3ffff80 [26]
          (165) |11111111|11111111|11100000|01 [26]       3ffff81 [26]
          (166) |11111111|11111111|11100000|10 [26]       3ffff82 [26]
          (167) |11111111|11111111|11100000|11 [26]       3ffff83 [26]
          (168) |11111111|11111111|11100001|00 [26]       3ffff84 [26]
          (169) |11111111|11111111|11100001|01 [26]       3ffff85 [26]
          (170) |11111111|11111111|11100001|10 [26]       3ffff86 [26]
          (171) |11111111|11111111|11100001|11 [26]       3ffff87 [26]
          (172) |11111111|11111111|11100010|00 [26]       3ffff88 [26]
          (173) |11111111|11111111|11100010|01 [26]       3ffff89 [26]
          (174) |11111111|11111111|11100010|10 [26]       3ffff8a [26]
          (175) |11111111|11111111|11100010|11 [26]       3ffff8b [26]
          (176) |11111111|11111111|11100011|00 [26]       3ffff8c [26]
          (177) |11111111|11111111|11100011|01 [26]       3ffff8d [26]
          (178) |11111111|11111111|11100011|10 [26]       3ffff8e [26]
          (179) |11111111|11111111|11100011|11 [26]       3ffff8f [26]
          (180) |11111111|11111111|11100100|00 [26]       3ffff90 [26]
          (181) |11111111|11111111|11100100|01 [26]       3ffff91 [26]
          (182) |11111111|11111111|11100100|10 [26]       3ffff92 [26]
          (183) |11111111|11111111|11100100|11 [26]       3ffff93 [26]
          (184) |11111111|11111111|11100101|00 [26]       3ffff94 [26]
          (185) |11111111|11111111|11100101|01 [26]       3ffff95 [26]
          (186) |11111111|11111111|11100101|10 [26]       3ffff96 [26]
          (187) |11111111|11111111|11100101|11 [26]       3ffff97 [26]
          (188) |11111111|11111111|11100110|00 [26]       3ffff98 [26]
          (189) |11111111|11111111|11100110|01 [26]       3ffff99 [26]
          (190) |11111111|11111111|11100110|10 [26]       3ffff9a [26]
          (191) |11111111|11111111|11100110|11 [26]       3ffff9b [26]
          (192) |11111111|11111111|11100111|00 [26]       3ffff9c [26]
          (193) |11111111|11111111|11100111|01 [26]       3ffff9d [26]
          (194) |11111111|11111111|11100111|10 [26]       3ffff9e [26]
          (195) |11111111|11111111|11100111|11 [26]       3ffff9f [26]
          (196) |11111111|11111111|11101000|00 [26]       3ffffa0 [26]
          (197) |11111111|11111111|11101000|01 [26]       3ffffa1 [26]
          (198) |11111111|11111111|11101000|10 [26]       3ffffa2 [26]
          (199) |11111111|11111111|11101000|11 [26]       3ffffa3 [26]
          (200) |11111111|11111111|11101001|00 [26]       3ffffa4 [26]
          (201) |11111111|11111111|11101001|01 [26]       3ffffa5 [26]
          (202) |11111111|11111111|11101001|10 [26]       3ffffa6 [26]
          (203) |11111111|11111111|11101001|11 [26]       3ffffa7 [26]
          (204) |11111111|11111111|11101010|00 [26]       3ffffa8 [26]
          (205) |11111111|11111111|11101010|01 [26]       3ffffa9 [26]
          (206) |11111111|11111111|11101010|10 [26]       3ffffaa [26]
          (207) |11111111|11111111|11101010|11 [26]       3ffffab [26]
          (208) |11111111|11111111|11101011|00 [26]       3ffffac [26]
          (209) |11111111|11111111|11101011|01 [26]       3ffffad [26]
          (210) |11111111|11111111|11101011|10 [26]       3ffffae [26]
          (211) |11111111|11111111|11101011|11 [26]       3ffffaf [26]
          (212) |11111111|11111111|11101100|00 [26]       3ffffb0 [26]
          (213) |11111111|11111111|11101100|01 [26]       3ffffb1 [26]
          (214) |11111111|11111111|11101100|10 [26]       3ffffb2 [26]
          (215) |11111111|11111111|11101100|11 [26]       3ffffb3 [26]
          (216) |11111111|11111111|11101101|00 [26]       3ffffb4 [26]
          (217) |11111111|11111111|11101101|01 [26]       3ffffb5 [26]
          (218) |11111111|11111111|11101101|10 [26]       3ffffb6 [26]
          (219) |11111111|11111111|11101101|11 [26]       3ffffb7 [26]
          (220) |11111111|11111111|11101110|00 [26]       3ffffb8 [26]
          (221) |11111111|11111111|11101110|01 [26]       3ffffb9 [26]
          (222) |11111111|11111111|11101110|10 [26]       3ffffba [26]
          (223) |11111111|11111111|11101110|11 [26]       3ffffbb [26]
          (224) |11111111|11111111|11101111|00 [26]       3ffffbc [26]
          (225) |11111111|11111111|11101111|01 [26]       3ffffbd [26]
          (226) |11111111|11111111|11101111|10 [26]       3ffffbe [26]
          (227) |11111111|11111111|11101111|11 [26]       3ffffbf [26]
          (228) |11111111|11111111|11110000|00 [26]       3ffffc0 [26]
          (229) |11111111|11111111|11110000|01 [26]       3ffffc1 [26]
          (230) |11111111|11111111|11110000|10 [26]       3ffffc2 [26]
          (231) |11111111|11111111|11110000|11 [26]       3ffffc3 [26]
          (232) |11111111|11111111|11110001|00 [26]       3ffffc4 [26]
          (233) |11111111|11111111|11110001|01 [26]       3ffffc5 [26]
          (234) |11111111|11111111|11110001|10 [26]       3ffffc6 [26]
          (235) |11111111|11111111|11110001|11 [26]       3ffffc7 [26]
          (236) |11111111|11111111|11110010|00 [26]       3ffffc8 [26]
          (237) |11111111|11111111|11110010|01 [26]       3ffffc9 [26]
          (238) |11111111|11111111|11110010|10 [26]       3ffffca [26]
          (239) |11111111|11111111|11110010|11 [26]       3ffffcb [26]
          (240) |11111111|11111111|11110011|00 [26]       3ffffcc [26]
          (241) |11111111|11111111|11110011|01 [26]       3ffffcd [26]
          (242) |11111111|11111111|11110011|10 [26]       3ffffce [26]
          (243) |11111111|11111111|11110011|11 [26]       3ffffcf [26]
          (244) |11111111|11111111|11110100|00 [26]       3ffffd0 [26]
          (245) |11111111|11111111|11110100|01 [26]       3ffffd1 [26]
          (246) |11111111|11111111|11110100|10 [26]       3ffffd2 [26]
          (247) |11111111|11111111|11110100|11 [26]       3ffffd3 [26]
          (248) |11111111|11111111|11110101|00 [26]       3ffffd4 [26]
          (249) |11111111|11111111|11110101|01 [26]       3ffffd5 [26]
          (250) |11111111|11111111|11110101|10 [26]       3ffffd6 [26]
          (251) |11111111|11111111|11110101|11 [26]       3ffffd7 [26]
          (252) |11111111|11111111|11110110|00 [26]       3ffffd8 [26]
          (253) |11111111|11111111|11110110|01 [26]       3ffffd9 [26]
          (254) |11111111|11111111|11110110|10 [26]       3ffffda [26]
          (255) |11111111|11111111|11110110|11 [26]       3ffffdb [26]
      EOS (256) |11111111|11111111|11110111|00 [26]       3ffffdc [26]
                
                        

    D. Huffman Codes for Responses

    The following Huffman codes are used when encoding string literals in the server to client direction.

    [rfc.comment.3: This table is out of date and needs updating. In particular, EOS needs to be at least 7-bits long and currently is not.]

                 aligned                                  aligned
                  to                           len         to     len
                  MSB                           in         LSB     in
           sym    as bits                      bits       as hex  bits
          (  0) |11111111|11111111|11011110|0 [25]        1ffffbc [25]
          (  1) |11111111|11111111|11011110|1 [25]        1ffffbd [25]
          (  2) |11111111|11111111|11011111|0 [25]        1ffffbe [25]
          (  3) |11111111|11111111|11011111|1 [25]        1ffffbf [25]
          (  4) |11111111|11111111|11100000|0 [25]        1ffffc0 [25]
          (  5) |11111111|11111111|11100000|1 [25]        1ffffc1 [25]
          (  6) |11111111|11111111|11100001|0 [25]        1ffffc2 [25]
          (  7) |11111111|11111111|11100001|1 [25]        1ffffc3 [25]
          (  8) |11111111|11111111|11100010|0 [25]        1ffffc4 [25]
          (  9) |11111111|11111111|11100010|1 [25]        1ffffc5 [25]
          ( 10) |11111111|11111111|11100011|0 [25]        1ffffc6 [25]
          ( 11) |11111111|11111111|11100011|1 [25]        1ffffc7 [25]
          ( 12) |11111111|11111111|11100100|0 [25]        1ffffc8 [25]
          ( 13) |11111111|11111111|11100100|1 [25]        1ffffc9 [25]
          ( 14) |11111111|11111111|11100101|0 [25]        1ffffca [25]
          ( 15) |11111111|11111111|11100101|1 [25]        1ffffcb [25]
          ( 16) |11111111|11111111|11100110|0 [25]        1ffffcc [25]
          ( 17) |11111111|11111111|11100110|1 [25]        1ffffcd [25]
          ( 18) |11111111|11111111|11100111|0 [25]        1ffffce [25]
          ( 19) |11111111|11111111|11100111|1 [25]        1ffffcf [25]
          ( 20) |11111111|11111111|11101000|0 [25]        1ffffd0 [25]
          ( 21) |11111111|11111111|11101000|1 [25]        1ffffd1 [25]
          ( 22) |11111111|11111111|11101001|0 [25]        1ffffd2 [25]
          ( 23) |11111111|11111111|11101001|1 [25]        1ffffd3 [25]
          ( 24) |11111111|11111111|11101010|0 [25]        1ffffd4 [25]
          ( 25) |11111111|11111111|11101010|1 [25]        1ffffd5 [25]
          ( 26) |11111111|11111111|11101011|0 [25]        1ffffd6 [25]
          ( 27) |11111111|11111111|11101011|1 [25]        1ffffd7 [25]
          ( 28) |11111111|11111111|11101100|0 [25]        1ffffd8 [25]
          ( 29) |11111111|11111111|11101100|1 [25]        1ffffd9 [25]
          ( 30) |11111111|11111111|11101101|0 [25]        1ffffda [25]
          ( 31) |11111111|11111111|11101101|1 [25]        1ffffdb [25]
      ' ' ( 32) |0000 [4]                                        0 [4]
      '!' ( 33) |11111111|1010 [12]                           ffa [12]
      '"' ( 34) |1101010 [7]                                    6a [7]
      '#' ( 35) |11111111|11010 [13]                         1ffa [13]
      '$' ( 36) |11111111|111100 [14]                        3ffc [14]
      '%' ( 37) |11110110|0 [9]                                1ec [9]
      '&' ( 38) |11111110|00 [10]                             3f8 [10]
      ''' ( 39) |11111111|11011 [13]                         1ffb [13]
      '(' ( 40) |11110110|1 [9]                                1ed [9]
      ')' ( 41) |11110111|0 [9]                                1ee [9]
      '*' ( 42) |11111111|1011 [12]                           ffb [12]
      '+' ( 43) |11111111|010 [11]                            7fa [11]
      ',' ( 44) |100010 [6]                                     22 [6]
      '-' ( 45) |100011 [6]                                     23 [6]
      '.' ( 46) |100100 [6]                                     24 [6]
      '/' ( 47) |1101011 [7]                                    6b [7]
      '0' ( 48) |0001 [4]                                        1 [4]
      '1' ( 49) |0010 [4]                                        2 [4]
      '2' ( 50) |0011 [4]                                        3 [4]
      '3' ( 51) |01000 [5]                                       8 [5]
      '4' ( 52) |01001 [5]                                       9 [5]
      '5' ( 53) |01010 [5]                                       a [5]
      '6' ( 54) |100101 [6]                                     25 [6]
      '7' ( 55) |100110 [6]                                     26 [6]
      '8' ( 56) |01011 [5]                                       b [5]
      '9' ( 57) |01100 [5]                                       c [5]
      ':' ( 58) |01101 [5]                                       d [5]
      ';' ( 59) |11110111|1 [9]                                1ef [9]
      '<' ( 60) |11111111|11111010| [16]                     fffa [16]
      '=' ( 61) |1101100 [7]                                    6c [7]
      '>' ( 62) |11111111|11100 [13]                         1ffc [13]
      '?' ( 63) |11111111|1100 [12]                           ffc [12]
      '@' ( 64) |11111111|11111011| [16]                     fffb [16]
      'A' ( 65) |1101101 [7]                                    6d [7]
      'B' ( 66) |11101010| [8]                                  ea [8]
      'C' ( 67) |11101011| [8]                                  eb [8]
      'D' ( 68) |11101100| [8]                                  ec [8]
      'E' ( 69) |11101101| [8]                                  ed [8]
      'F' ( 70) |11101110| [8]                                  ee [8]
      'G' ( 71) |100111 [6]                                     27 [6]
      'H' ( 72) |11111000|0 [9]                                1f0 [9]
      'I' ( 73) |11101111| [8]                                  ef [8]
      'J' ( 74) |11110000| [8]                                  f0 [8]
      'K' ( 75) |11111110|01 [10]                             3f9 [10]
      'L' ( 76) |11111000|1 [9]                                1f1 [9]
      'M' ( 77) |101000 [6]                                     28 [6]
      'N' ( 78) |11110001| [8]                                  f1 [8]
      'O' ( 79) |11110010| [8]                                  f2 [8]
      'P' ( 80) |11111001|0 [9]                                1f2 [9]
      'Q' ( 81) |11111110|10 [10]                             3fa [10]
      'R' ( 82) |11111001|1 [9]                                1f3 [9]
      'S' ( 83) |101001 [6]                                     29 [6]
      'T' ( 84) |01110 [5]                                       e [5]
      'U' ( 85) |11111010|0 [9]                                1f4 [9]
      'V' ( 86) |11111010|1 [9]                                1f5 [9]
      'W' ( 87) |11110011| [8]                                  f3 [8]
      'X' ( 88) |11111110|11 [10]                             3fb [10]
      'Y' ( 89) |11111011|0 [9]                                1f6 [9]
      'Z' ( 90) |11111111|00 [10]                             3fc [10]
      '[' ( 91) |11111111|011 [11]                            7fb [11]
      '\' ( 92) |11111111|11101 [13]                         1ffd [13]
      ']' ( 93) |11111111|100 [11]                            7fc [11]
      '^' ( 94) |11111111|1111100 [15]                       7ffc [15]
      '_' ( 95) |11111011|1 [9]                                1f7 [9]
      '`' ( 96) |11111111|11111111|0 [17]                   1fffe [17]
      'a' ( 97) |01111 [5]                                       f [5]
      'b' ( 98) |1101110 [7]                                    6e [7]
      'c' ( 99) |101010 [6]                                     2a [6]
      'd' (100) |101011 [6]                                     2b [6]
      'e' (101) |10000 [5]                                      10 [5]
      'f' (102) |1101111 [7]                                    6f [7]
      'g' (103) |1110000 [7]                                    70 [7]
      'h' (104) |1110001 [7]                                    71 [7]
      'i' (105) |101100 [6]                                     2c [6]
      'j' (106) |11111100|0 [9]                                1f8 [9]
      'k' (107) |11111100|1 [9]                                1f9 [9]
      'l' (108) |1110010 [7]                                    72 [7]
      'm' (109) |101101 [6]                                     2d [6]
      'n' (110) |101110 [6]                                     2e [6]
      'o' (111) |101111 [6]                                     2f [6]
      'p' (112) |110000 [6]                                     30 [6]
      'q' (113) |11111101|0 [9]                                1fa [9]
      'r' (114) |110001 [6]                                     31 [6]
      's' (115) |110010 [6]                                     32 [6]
      't' (116) |110011 [6]                                     33 [6]
      'u' (117) |110100 [6]                                     34 [6]
      'v' (118) |1110011 [7]                                    73 [7]
      'w' (119) |11110100| [8]                                  f4 [8]
      'x' (120) |1110100 [7]                                    74 [7]
      'y' (121) |11110101| [8]                                  f5 [8]
      'z' (122) |11111101|1 [9]                                1fb [9]
      '{' (123) |11111111|11111100| [16]                     fffc [16]
      '|' (124) |11111111|111101 [14]                        3ffd [14]
      '}' (125) |11111111|11111101| [16]                     fffd [16]
      '~' (126) |11111111|11111110| [16]                     fffe [16]
          (127) |11111111|11111111|11101110|0 [25]        1ffffdc [25]
          (128) |11111111|11111111|11101110|1 [25]        1ffffdd [25]
          (129) |11111111|11111111|11101111|0 [25]        1ffffde [25]
          (130) |11111111|11111111|11101111|1 [25]        1ffffdf [25]
          (131) |11111111|11111111|11110000|0 [25]        1ffffe0 [25]
          (132) |11111111|11111111|11110000|1 [25]        1ffffe1 [25]
          (133) |11111111|11111111|11110001|0 [25]        1ffffe2 [25]
          (134) |11111111|11111111|11110001|1 [25]        1ffffe3 [25]
          (135) |11111111|11111111|11110010|0 [25]        1ffffe4 [25]
          (136) |11111111|11111111|11110010|1 [25]        1ffffe5 [25]
          (137) |11111111|11111111|11110011|0 [25]        1ffffe6 [25]
          (138) |11111111|11111111|11110011|1 [25]        1ffffe7 [25]
          (139) |11111111|11111111|11110100|0 [25]        1ffffe8 [25]
          (140) |11111111|11111111|11110100|1 [25]        1ffffe9 [25]
          (141) |11111111|11111111|11110101|0 [25]        1ffffea [25]
          (142) |11111111|11111111|11110101|1 [25]        1ffffeb [25]
          (143) |11111111|11111111|11110110|0 [25]        1ffffec [25]
          (144) |11111111|11111111|11110110|1 [25]        1ffffed [25]
          (145) |11111111|11111111|11110111|0 [25]        1ffffee [25]
          (146) |11111111|11111111|11110111|1 [25]        1ffffef [25]
          (147) |11111111|11111111|11111000|0 [25]        1fffff0 [25]
          (148) |11111111|11111111|11111000|1 [25]        1fffff1 [25]
          (149) |11111111|11111111|11111001|0 [25]        1fffff2 [25]
          (150) |11111111|11111111|11111001|1 [25]        1fffff3 [25]
          (151) |11111111|11111111|11111010|0 [25]        1fffff4 [25]
          (152) |11111111|11111111|11111010|1 [25]        1fffff5 [25]
          (153) |11111111|11111111|11111011|0 [25]        1fffff6 [25]
          (154) |11111111|11111111|11111011|1 [25]        1fffff7 [25]
          (155) |11111111|11111111|11111100|0 [25]        1fffff8 [25]
          (156) |11111111|11111111|11111100|1 [25]        1fffff9 [25]
          (157) |11111111|11111111|11111101|0 [25]        1fffffa [25]
          (158) |11111111|11111111|11111101|1 [25]        1fffffb [25]
          (159) |11111111|11111111|11111110|0 [25]        1fffffc [25]
          (160) |11111111|11111111|11111110|1 [25]        1fffffd [25]
          (161) |11111111|11111111|11111111|0 [25]        1fffffe [25]
          (162) |11111111|11111111|11111111|1 [25]        1ffffff [25]
          (163) |11111111|11111111|10000000| [24]          ffff80 [24]
          (164) |11111111|11111111|10000001| [24]          ffff81 [24]
          (165) |11111111|11111111|10000010| [24]          ffff82 [24]
          (166) |11111111|11111111|10000011| [24]          ffff83 [24]
          (167) |11111111|11111111|10000100| [24]          ffff84 [24]
          (168) |11111111|11111111|10000101| [24]          ffff85 [24]
          (169) |11111111|11111111|10000110| [24]          ffff86 [24]
          (170) |11111111|11111111|10000111| [24]          ffff87 [24]
          (171) |11111111|11111111|10001000| [24]          ffff88 [24]
          (172) |11111111|11111111|10001001| [24]          ffff89 [24]
          (173) |11111111|11111111|10001010| [24]          ffff8a [24]
          (174) |11111111|11111111|10001011| [24]          ffff8b [24]
          (175) |11111111|11111111|10001100| [24]          ffff8c [24]
          (176) |11111111|11111111|10001101| [24]          ffff8d [24]
          (177) |11111111|11111111|10001110| [24]          ffff8e [24]
          (178) |11111111|11111111|10001111| [24]          ffff8f [24]
          (179) |11111111|11111111|10010000| [24]          ffff90 [24]
          (180) |11111111|11111111|10010001| [24]          ffff91 [24]
          (181) |11111111|11111111|10010010| [24]          ffff92 [24]
          (182) |11111111|11111111|10010011| [24]          ffff93 [24]
          (183) |11111111|11111111|10010100| [24]          ffff94 [24]
          (184) |11111111|11111111|10010101| [24]          ffff95 [24]
          (185) |11111111|11111111|10010110| [24]          ffff96 [24]
          (186) |11111111|11111111|10010111| [24]          ffff97 [24]
          (187) |11111111|11111111|10011000| [24]          ffff98 [24]
          (188) |11111111|11111111|10011001| [24]          ffff99 [24]
          (189) |11111111|11111111|10011010| [24]          ffff9a [24]
          (190) |11111111|11111111|10011011| [24]          ffff9b [24]
          (191) |11111111|11111111|10011100| [24]          ffff9c [24]
          (192) |11111111|11111111|10011101| [24]          ffff9d [24]
          (193) |11111111|11111111|10011110| [24]          ffff9e [24]
          (194) |11111111|11111111|10011111| [24]          ffff9f [24]
          (195) |11111111|11111111|10100000| [24]          ffffa0 [24]
          (196) |11111111|11111111|10100001| [24]          ffffa1 [24]
          (197) |11111111|11111111|10100010| [24]          ffffa2 [24]
          (198) |11111111|11111111|10100011| [24]          ffffa3 [24]
          (199) |11111111|11111111|10100100| [24]          ffffa4 [24]
          (200) |11111111|11111111|10100101| [24]          ffffa5 [24]
          (201) |11111111|11111111|10100110| [24]          ffffa6 [24]
          (202) |11111111|11111111|10100111| [24]          ffffa7 [24]
          (203) |11111111|11111111|10101000| [24]          ffffa8 [24]
          (204) |11111111|11111111|10101001| [24]          ffffa9 [24]
          (205) |11111111|11111111|10101010| [24]          ffffaa [24]
          (206) |11111111|11111111|10101011| [24]          ffffab [24]
          (207) |11111111|11111111|10101100| [24]          ffffac [24]
          (208) |11111111|11111111|10101101| [24]          ffffad [24]
          (209) |11111111|11111111|10101110| [24]          ffffae [24]
          (210) |11111111|11111111|10101111| [24]          ffffaf [24]
          (211) |11111111|11111111|10110000| [24]          ffffb0 [24]
          (212) |11111111|11111111|10110001| [24]          ffffb1 [24]
          (213) |11111111|11111111|10110010| [24]          ffffb2 [24]
          (214) |11111111|11111111|10110011| [24]          ffffb3 [24]
          (215) |11111111|11111111|10110100| [24]          ffffb4 [24]
          (216) |11111111|11111111|10110101| [24]          ffffb5 [24]
          (217) |11111111|11111111|10110110| [24]          ffffb6 [24]
          (218) |11111111|11111111|10110111| [24]          ffffb7 [24]
          (219) |11111111|11111111|10111000| [24]          ffffb8 [24]
          (220) |11111111|11111111|10111001| [24]          ffffb9 [24]
          (221) |11111111|11111111|10111010| [24]          ffffba [24]
          (222) |11111111|11111111|10111011| [24]          ffffbb [24]
          (223) |11111111|11111111|10111100| [24]          ffffbc [24]
          (224) |11111111|11111111|10111101| [24]          ffffbd [24]
          (225) |11111111|11111111|10111110| [24]          ffffbe [24]
          (226) |11111111|11111111|10111111| [24]          ffffbf [24]
          (227) |11111111|11111111|11000000| [24]          ffffc0 [24]
          (228) |11111111|11111111|11000001| [24]          ffffc1 [24]
          (229) |11111111|11111111|11000010| [24]          ffffc2 [24]
          (230) |11111111|11111111|11000011| [24]          ffffc3 [24]
          (231) |11111111|11111111|11000100| [24]          ffffc4 [24]
          (232) |11111111|11111111|11000101| [24]          ffffc5 [24]
          (233) |11111111|11111111|11000110| [24]          ffffc6 [24]
          (234) |11111111|11111111|11000111| [24]          ffffc7 [24]
          (235) |11111111|11111111|11001000| [24]          ffffc8 [24]
          (236) |11111111|11111111|11001001| [24]          ffffc9 [24]
          (237) |11111111|11111111|11001010| [24]          ffffca [24]
          (238) |11111111|11111111|11001011| [24]          ffffcb [24]
          (239) |11111111|11111111|11001100| [24]          ffffcc [24]
          (240) |11111111|11111111|11001101| [24]          ffffcd [24]
          (241) |11111111|11111111|11001110| [24]          ffffce [24]
          (242) |11111111|11111111|11001111| [24]          ffffcf [24]
          (243) |11111111|11111111|11010000| [24]          ffffd0 [24]
          (244) |11111111|11111111|11010001| [24]          ffffd1 [24]
          (245) |11111111|11111111|11010010| [24]          ffffd2 [24]
          (246) |11111111|11111111|11010011| [24]          ffffd3 [24]
          (247) |11111111|11111111|11010100| [24]          ffffd4 [24]
          (248) |11111111|11111111|11010101| [24]          ffffd5 [24]
          (249) |11111111|11111111|11010110| [24]          ffffd6 [24]
          (250) |11111111|11111111|11010111| [24]          ffffd7 [24]
          (251) |11111111|11111111|11011000| [24]          ffffd8 [24]
          (252) |11111111|11111111|11011001| [24]          ffffd9 [24]
          (253) |11111111|11111111|11011010| [24]          ffffda [24]
          (254) |11111111|11111111|11011011| [24]          ffffdb [24]
          (255) |11111111|11111111|11011100| [24]          ffffdc [24]
      EOS (256) |11111111|11111111|11011101| [24]          ffffdd [24]
                
                        

    E. Examples

    A number of examples are worked through here, for both requests and responses, and with and without huffman coding.

    E.1. Request Decoding Example With Huffman

    # Header set to be encoded
    :method: GET
    :scheme: http
    :path: /
    :authority: www.foo.com
    
    # Hexdump of encoded data which will be decoded
    02 84 f7 77 78 ff 07 83 ce 31 77 06 81 0f 04 88 | ...wx....1w.....
    db 6d 89 8b 5a 44 b7 4f                         | .m..ZD.O
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '02'
        name_index:
            encoded: "02"
            decoded: 2
        value_data_length:
            encoded: "84"
            decoded: 4
        value_data:
            is_huffman_encoded: 1
            encoded: "f77778ff"
            decoded: "GET"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '07'
        name_index:
            encoded: "07"
            decoded: 7
        value_data_length:
            encoded: "83"
            decoded: 3
        value_data:
            is_huffman_encoded: 1
            encoded: "ce3177"
            decoded: "http"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '06'
        name_index:
            encoded: "06"
            decoded: 6
        value_data_length:
            encoded: "81"
            decoded: 1
        value_data:
            is_huffman_encoded: 1
            encoded: "0f"
            decoded: "/"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '04'
        name_index:
            encoded: "04"
            decoded: 4
        value_data_length:
            encoded: "88"
            decoded: 8
        value_data:
            is_huffman_encoded: 1
            encoded: "db6d898b5a44b74f"
            decoded: "www.foo.com"
    
    
    # Decoded header set
    :authority: www.foo.com
    :method: GET
    :path: /
    :scheme: http
    
    #########################
    
    # Header set to be encoded
    :method: GET
    :scheme: https
    :path: /
    :authority: www.bar.com
    cache-control: no-cache
    
    # Hexdump of encoded data which will be decoded
    03 84 ce 31 74 3f 02 88 db 6d 89 7a 1e 44 b7 4f | ...1t?...m.z.D.O
    1d 86 63 65 4a 13 98 ff 83 85                   | ..ceJ.....
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '03'
        name_index:
            encoded: "03"
            decoded: 3
        value_data_length:
            encoded: "84"
            decoded: 4
        value_data:
            is_huffman_encoded: 1
            encoded: "ce31743f"
            decoded: "https"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '02'
        name_index:
            encoded: "02"
            decoded: 2
        value_data_length:
            encoded: "88"
            decoded: 8
        value_data:
            is_huffman_encoded: 1
            encoded: "db6d897a1e44b74f"
            decoded: "www.bar.com"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '1d'
        name_index:
            encoded: "1d"
            decoded: 29
        value_data_length:
            encoded: "86"
            decoded: 6
        value_data:
            is_huffman_encoded: 1
            encoded: "63654a1398ff"
            decoded: "no-cache"
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '83'
        entry_index:
            encoded: "83"
            decoded: 3
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '85'
        entry_index:
            encoded: "85"
            decoded: 5
    
    
    # Decoded header set
    :authority: www.bar.com
    :method: GET
    :path: /
    :scheme: https
    cache-control: no-cache
    
    #########################
    
    # Header set to be encoded
    :method: GET
    :scheme: https
    :path: /custom-path.css
    :authority: www.bar.com
    custom-key: custom-value
    
    # Hexdump of encoded data which will be decoded
    05 8b 04 eb 08 b7 49 5c 88 e6 44 c2 1f 00 88 4e | ......I\..D....N
    b0 8b 74 97 90 fa 7f 89 4e b0 8b 74 97 9a 17 a8 | ..t.....N..t....
    ff 82 86                                        | ...
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '05'
        name_index:
            encoded: "05"
            decoded: 5
        value_data_length:
            encoded: "8b"
            decoded: 11
        value_data:
            is_huffman_encoded: 1
            encoded: "04eb08b7495c88e644c21f"
            decoded: "/custom-path.css"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '00'
        name_index:
            encoded: "00"
            decoded: 0
        name_data_length:
            encoded: "88"
            decoded: 8
        name_data:
            is_huffman_encoded: 1
            encoded: "4eb08b749790fa7f"
            decoded: "custom-key"
        value_data_length:
            encoded: "89"
            decoded: 9
        value_data:
            is_huffman_encoded: 1
            encoded: "4eb08b74979a17a8ff"
            decoded: "custom-value"
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '82'
        entry_index:
            encoded: "82"
            decoded: 2
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '86'
        entry_index:
            encoded: "86"
            decoded: 6
    
    
    # Decoded header set
    :authority: www.bar.com
    :method: GET
    :path: /custom-path.css
    :scheme: https
    custom-key: custom-value
    
    #########################
    
                      

    E.2. Request Decoding Example Without Huffman

    # Header set to be encoded
    :method: GET
    :scheme: http
    :path: /
    :authority: www.foo.com
    
    # Hexdump of encoded data which will be decoded
    02 03 47 45 54 07 04 68 74 74 70 06 01 2f 04 0b | ..GET..http../..
    77 77 77 2e 66 6f 6f 2e 63 6f 6d                | www.foo.com
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '02'
        name_index:
            encoded: "02"
            decoded: 2
        value_data_length:
            encoded: "03"
            decoded: 3
        value_data:
            is_huffman_encoded: 0
            encoded: "474554"
            decoded: "GET"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '07'
        name_index:
            encoded: "07"
            decoded: 7
        value_data_length:
            encoded: "04"
            decoded: 4
        value_data:
            is_huffman_encoded: 0
            encoded: "68747470"
            decoded: "http"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '06'
        name_index:
            encoded: "06"
            decoded: 6
        value_data_length:
            encoded: "01"
            decoded: 1
        value_data:
            is_huffman_encoded: 0
            encoded: "2f"
            decoded: "/"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '04'
        name_index:
            encoded: "04"
            decoded: 4
        value_data_length:
            encoded: "0b"
            decoded: 11
        value_data:
            is_huffman_encoded: 0
            encoded: "7777772e666f6f2e636f6d"
            decoded: "www.foo.com"
    
    
    # Decoded header set
    :authority: www.foo.com
    :method: GET
    :path: /
    :scheme: http
    
    #########################
    
    # Header set to be encoded
    :method: GET
    :scheme: https
    :path: /
    :authority: www.bar.com
    cache-control: no-cache
    
    # Hexdump of encoded data which will be decoded
    03 05 68 74 74 70 73 02 0b 77 77 77 2e 62 61 72 | ..https..www.bar
    2e 63 6f 6d 1d 08 6e 6f 2d 63 61 63 68 65 83 85 | .com..no-cache..
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '03'
        name_index:
            encoded: "03"
            decoded: 3
        value_data_length:
            encoded: "05"
            decoded: 5
        value_data:
            is_huffman_encoded: 0
            encoded: "6874747073"
            decoded: "https"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '02'
        name_index:
            encoded: "02"
            decoded: 2
        value_data_length:
            encoded: "0b"
            decoded: 11
        value_data:
            is_huffman_encoded: 0
            encoded: "7777772e6261722e636f6d"
            decoded: "www.bar.com"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '1d'
        name_index:
            encoded: "1d"
            decoded: 29
        value_data_length:
            encoded: "08"
            decoded: 8
        value_data:
            is_huffman_encoded: 0
            encoded: "6e6f2d6361636865"
            decoded: "no-cache"
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '83'
        entry_index:
            encoded: "83"
            decoded: 3
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '85'
        entry_index:
            encoded: "85"
            decoded: 5
    
    
    # Decoded header set
    :authority: www.bar.com
    :method: GET
    :path: /
    :scheme: https
    cache-control: no-cache
    
    #########################
    
    # Header set to be encoded
    :method: GET
    :scheme: https
    :path: /custom-path.css
    :authority: www.bar.com
    custom-key: custom-value
    
    # Hexdump of encoded data which will be decoded
    05 10 2f 63 75 73 74 6f 6d 2d 70 61 74 68 2e 63 | ../custom-path.c
    73 73 00 0a 63 75 73 74 6f 6d 2d 6b 65 79 0c 63 | ss..custom-key.c
    75 73 74 6f 6d 2d 76 61 6c 75 65 82 86          | ustom-value..
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '05'
        name_index:
            encoded: "05"
            decoded: 5
        value_data_length:
            encoded: "10"
            decoded: 16
        value_data:
            is_huffman_encoded: 0
            encoded: "2f637573746f6d2d706174682e637373"
            decoded: "/custom-path.css"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '00'
        name_index:
            encoded: "00"
            decoded: 0
        name_data_length:
            encoded: "0a"
            decoded: 10
        name_data:
            is_huffman_encoded: 0
            encoded: "637573746f6d2d6b6579"
            decoded: "custom-key"
        value_data_length:
            encoded: "0c"
            decoded: 12
        value_data:
            is_huffman_encoded: 0
            encoded: "637573746f6d2d76616c7565"
            decoded: "custom-value"
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '82'
        entry_index:
            encoded: "82"
            decoded: 2
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '86'
        entry_index:
            encoded: "86"
            decoded: 6
    
    
    # Decoded header set
    :authority: www.bar.com
    :method: GET
    :path: /custom-path.css
    :scheme: https
    custom-key: custom-value
    
    #########################
    
                      

    E.3. Response Decoding Example With Huffman

    # Header set to be encoded
    :status: 302
    cache-control: private
    date: Mon, 21 OCt 2013 20:13:21 GMT
    location: : https://www.bar.com
    
    # Hexdump of encoded data which will be decoded
    08 82 40 9f 18 86 c3 1b 39 bf 38 7f 22 92 a2 fb | ..@.....9.8."...
    a2 03 20 f2 eb cc 0c 49 00 62 d2 43 4c 82 7a 1d | .. ....I.b.CL.z.
    2f 91 68 71 cf 3c 32 6e bd 7e 9e 9e 92 6e 7e 32 | /.hq.<2n.~...n~2
    55 7d bf                                        | U}.
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '08'
        name_index:
            encoded: "08"
            decoded: 8
        value_data_length:
            encoded: "82"
            decoded: 2
        value_data:
            is_huffman_encoded: 1
            encoded: "409f"
            decoded: "302"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '18'
        name_index:
            encoded: "18"
            decoded: 24
        value_data_length:
            encoded: "86"
            decoded: 6
        value_data:
            is_huffman_encoded: 1
            encoded: "c31b39bf387f"
            decoded: "private"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '22'
        name_index:
            encoded: "22"
            decoded: 34
        value_data_length:
            encoded: "92"
            decoded: 18
        value_data:
            is_huffman_encoded: 1
            encoded: "a2fba20320f2ebcc0c490062d2434c827a1d"
            decoded: "Mon, 21 OCt 2013 20:13:21 GMT"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '2f'
        name_index:
            encoded: "2f"
            decoded: 47
        value_data_length:
            encoded: "91"
            decoded: 17
        value_data:
            is_huffman_encoded: 1
            encoded: "6871cf3c326ebd7e9e9e926e7e32557dbf"
            decoded: ": https://www.bar.com"
    
    
    # Decoded header set
    :status: 302
    cache-control: private
    date: Mon, 21 OCt 2013 20:13:21 GMT
    location: : https://www.bar.com
    
    #########################
    
    # Header set to be encoded
    :status: 200
    cache-control: private
    date: Mon, 21 OCt 2013 20:13:22 GMT
    location: https://www.bar.com
    content-encoding: gzip
    set-cookie: foo=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAALASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUAXLQEU\
    AXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUA\
    XLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQW\
    EOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEI\
    UALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ1234 max-age=3600; version=1
    
    # Hexdump of encoded data which will be decoded
    04 82 31 1f 03 92 a2 fb a2 03 20 f2 eb cc 0c 49 | ..1....... ....I
    00 62 d2 43 4c c2 7a 1d 03 90 e3 9e 78 64 dd 7a | .b.CL.z.....xd.z
    fd 3d 3d 24 dc fc 64 aa fb 7f 20 84 e1 fb b3 0f | .==$..d... .....
    3d ff ee 02 df 7d fb 36 ed db b7 6e dd bb 76 ed | =....}.6...n..v.
    db b7 6e dd bb 76 ed db b7 6e dd bb 76 ed db b7 | ..n..v...n..v...
    6e dd bb 76 ed db b7 6e dd bb 76 ed db b7 6e dd | n..v...n..v...n.
    bb 76 ed db b7 6e dd bb 76 ed db b7 6e dd bb 76 | .v...n..v...n..v
    ed db b7 6e dd bb 7e 3b 69 ec f0 fe 7e 1f d7 f3 | ...n..~;i...~...
    d5 fe 7f 7e 5f d7 9f 6f 97 cb bf e9 b7 fb fe bc | ...~_..o........
    fb 7c bb fe 9b 7f bf 8f 87 f3 f0 fe bc fc bb 7b | .|.............{
    fe 9b 7e 3f d7 9f 6f 97 7f d3 6f f7 f1 fe bb 7e | ..~?..o...o....~
    9b 7f bf 8f c7 f9 f0 db 4f 67 f5 e7 db e5 f4 ef | ........Og......
    db fd f8 91 a1 3f 1d b4 f6 78 7f 3f 0f eb f9 ea | .....?...x.?....
    ff 3f bf 2f eb cf b7 cb e5 df f4 db fd ff 5e 7d | .?./..........^}
    be 5d ff 4d bf df c7 c3 f9 f8 7f 5e 7e 5d bd ff | .].M.......^~]..
    4d bf 1f eb cf b7 cb bf e9 b7 fb f8 ff 5d bf 4d | M............].M
    bf df c7 e3 fc f8 6d a7 b3 fa f3 ed f2 fa 77 ed | ......m.......w.
    fe fc 48 d0 9f 8e da 7b 3c 3f 9f 87 f5 fc f5 7f | ..H....{<?......
    9f df 97 f5 e7 db e5 f2 ef fa 6d fe ff af 3e df | ..........m...>.
    2e ff a6 df ef e3 e1 fc fc 3f af 3f 2e de ff a6 | .........?.?....
    df 8f f5 e7 db e5 df f4 db fd fc 7f ae df a6 df | ................
    ef e3 f1 fe 7c 36 d3 d9 fd 79 f6 f9 7d 3b f6 ff | ....|6...y..};..
    7e 24 68 4f c7 6d 3d 9e 1f cf c3 fa fe 7a bf cf | ~$hO.m=......z..
    ef cb fa f3 ed f2 f9 77 fd 36 ff 7f d7 9f 6f 97 | .......w.6....o.
    7f d3 6f f7 f1 f0 fe 7e 1f d7 9f 97 6f 7f d3 6f | ..o....~....o..o
    c7 fa f3 ed f2 ef fa 6d fe fe 3f d7 6f d3 6f f7 | .......m..?.o.o.
    f1 f8 ff 3e 1b 69 ec fe bc fb 7c be 9d fb 7f bf | ...>.i....|.....
    12 34 27 fc ff 3f cf f3 fc ff 3f cf f3 fc ff 3f | .4'..?....?....?
    cf f3 fc ff 3f cf f3 fc ff 3f cf f3 fc ff 3f cf | ....?....?....?.
    f3 fc ff 3f cf f3 fc ff 3f cf f3 fc ff 3f cf f3 | ...?....?....?..
    fc ff 3f cf f3 fc ff 3f cf f3 fc ff 3f cf f3 fc | ..?....?....?...
    ff 3f cf f3 fc ff 3f cf f3 fc ff 3f cf f3 fc ff | .?....?....?....
    3f cf f3 fc ff 3f cf f3 fc ff 3f cf f0 8d 09 0b | ?....?....?.....
    5f d2 37 f0 86 c4 4a 23 ef 0e 70 c7 2b 2f bb 61 | _.7...J#..p.+/.a
    7f 85 86 88                                     | ....
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '04'
        name_index:
            encoded: "04"
            decoded: 4
        value_data_length:
            encoded: "82"
            decoded: 2
        value_data:
            is_huffman_encoded: 1
            encoded: "311f"
            decoded: "200"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '03'
        name_index:
            encoded: "03"
            decoded: 3
        value_data_length:
            encoded: "92"
            decoded: 18
        value_data:
            is_huffman_encoded: 1
            encoded: "a2fba20320f2ebcc0c490062d2434cc27a1d"
            decoded: "Mon, 21 OCt 2013 20:13:22 GMT"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '03'
        name_index:
            encoded: "03"
            decoded: 3
        value_data_length:
            encoded: "90"
            decoded: 16
        value_data:
            is_huffman_encoded: 1
            encoded: "e39e7864dd7afd3d3d24dcfc64aafb7f"
            decoded: "https://www.bar.com"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '20'
        name_index:
            encoded: "20"
            decoded: 32
        value_data_length:
            encoded: "84"
            decoded: 4
        value_data:
            is_huffman_encoded: 1
            encoded: "e1fbb30f"
            decoded: "gzip"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '3d'
        name_index:
            encoded: "3d"
            decoded: 61
        value_data_length:
            encoded: "ffee02"
            decoded: 493
        value_data:
            is_huffman_encoded: 1
            encoded: "df7dfb36eddbb76eddbb76eddbb76eddbb76eddbb76eddbb76edd\
    bb76eddbb76eddbb76eddbb76eddbb76eddbb76eddbb76eddbb76eddbb76eddbb76eddb\
    b76eddbb7e3b69ecf0fe7e1fd7f3d5fe7f7e5fd79f6f97cbbfe9b7fbfebcfb7cbbfe9b7\
    fbf8f87f3f0febcfcbb7bfe9b7e3fd79f6f977fd36ff7f1febb7e9b7fbf8fc7f9f0db4f\
    67f5e7dbe5f4efdbfdf891a13f1db4f6787f3f0febf9eaff3fbf2febcfb7cbe5dff4dbf\
    dff5e7dbe5dff4dbfdfc7c3f9f87f5e7e5dbdff4dbf1febcfb7cbbfe9b7fbf8ff5dbf4d\
    bfdfc7e3fcf86da7b3faf3edf2fa77edfefc48d09f8eda7b3c3f9f87f5fcf57f9fdf97f\
    5e7dbe5f2effa6dfeffaf3edf2effa6dfefe3e1fcfc3faf3f2edeffa6df8ff5e7dbe5df\
    f4dbfdfc7faedfa6dfefe3f1fe7c36d3d9fd79f6f97d3bf6ff7e24684fc76d3d9e1fcfc\
    3fafe7abfcfefcbfaf3edf2f977fd36ff7fd79f6f977fd36ff7f1f0fe7e1fd79f976f7f\
    d36fc7faf3edf2effa6dfefe3fd76fd36ff7f1f8ff3e1b69ecfebcfb7cbe9dfb7fbf123\
    427fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcf\
    f3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff\
    3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff08d090b5fd237f086c44a23ef0e70c7\
    2b2fbb617f"
            decoded: "foo=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAAAAAAAALASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIU\
    AXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQ\
    WEOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOE\
    IUALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJK\
    HQWOEIUALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234ZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ1234max-age=3600; version=1\
    "
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '85'
        entry_index:
            encoded: "85"
            decoded: 5
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '86'
        entry_index:
            encoded: "86"
            decoded: 6
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '88'
        entry_index:
            encoded: "88"
            decoded: 8
    
    
    # Decoded header set
    :status: 200
    cache-control: private
    content-encoding: gzip
    date: Mon, 21 OCt 2013 20:13:22 GMT
    location: https://www.bar.com
    set-cookie: foo=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAALASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUAXLQEU\
    AXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUA\
    XLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQW\
    EOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEI\
    UALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ1234 max-age=3600; version=1
    
    #########################
    
    # Header set to be encoded
    :status: 200
    cache-control: private
    date: Mon, 21 OCt 2013 20:13:22 GMT
    location: https://www.bar.com
    content-encoding: gzip
    set-cookie: foo=ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZLASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUAXLQEU\
    AXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUA\
    XLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQW\
    EOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEI\
    UALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA1234 max-age=3600; version=1
    
    # Hexdump of encoded data which will be decoded
    01 ff ee 02 df 7d fb 3f cf f3 fc ff 3f cf f3 fc | .....}.?....?...
    ff 3f cf f3 fc ff 3f cf f3 fc ff 3f cf f3 fc ff | .?....?....?....
    3f cf f3 fc ff 3f cf f3 fc ff 3f cf f3 fc ff 3f | ?....?....?....?
    cf f3 fc ff 3f cf f3 fc ff 3f cf f3 fc ff 3f cf | ....?....?....?.
    f3 fc ff 3f cf f3 fc ff 3f cf f3 fc ff 3f cf f3 | ...?....?....?..
    fc ff 3f cf f3 fc ff 3f cf f3 fc ff 3f cf f3 fc | ..?....?....?...
    ff 3e 3b 69 ec f0 fe 7e 1f d7 f3 d5 fe 7f 7e 5f | .>;i...~......~_
    d7 9f 6f 97 cb bf e9 b7 fb fe bc fb 7c bb fe 9b | ..o.........|...
    7f bf 8f 87 f3 f0 fe bc fc bb 7b fe 9b 7e 3f d7 | ..........{..~?.
    9f 6f 97 7f d3 6f f7 f1 fe bb 7e 9b 7f bf 8f c7 | .o...o....~.....
    f9 f0 db 4f 67 f5 e7 db e5 f4 ef db fd f8 91 a1 | ...Og...........
    3f 1d b4 f6 78 7f 3f 0f eb f9 ea ff 3f bf 2f eb | ?...x.?.....?./.
    cf b7 cb e5 df f4 db fd ff 5e 7d be 5d ff 4d bf | .........^}.].M.
    df c7 c3 f9 f8 7f 5e 7e 5d bd ff 4d bf 1f eb cf | ......^~]..M....
    b7 cb bf e9 b7 fb f8 ff 5d bf 4d bf df c7 e3 fc | ........].M.....
    f8 6d a7 b3 fa f3 ed f2 fa 77 ed fe fc 48 d0 9f | .m.......w...H..
    8e da 7b 3c 3f 9f 87 f5 fc f5 7f 9f df 97 f5 e7 | ..{<?...........
    db e5 f2 ef fa 6d fe ff af 3e df 2e ff a6 df ef | .....m...>......
    e3 e1 fc fc 3f af 3f 2e de ff a6 df 8f f5 e7 db | ....?.?.........
    e5 df f4 db fd fc 7f ae df a6 df ef e3 f1 fe 7c | ...............|
    36 d3 d9 fd 79 f6 f9 7d 3b f6 ff 7e 24 68 4f c7 | 6...y..};..~$hO.
    6d 3d 9e 1f cf c3 fa fe 7a bf cf ef cb fa f3 ed | m=......z.......
    f2 f9 77 fd 36 ff 7f d7 9f 6f 97 7f d3 6f f7 f1 | ..w.6....o...o..
    f0 fe 7e 1f d7 9f 97 6f 7f d3 6f c7 fa f3 ed f2 | ..~....o..o.....
    ef fa 6d fe fe 3f d7 6f d3 6f f7 f1 f8 ff 3e 1b | ..m..?.o.o....>.
    69 ec fe bc fb 7c be 9d fb 7f bf 12 34 27 6e dd | i....|......4'n.
    bb 76 ed db b7 6e dd bb 76 ed db b7 6e dd bb 76 | .v...n..v...n..v
    ed db b7 6e dd bb 76 ed db b7 6e dd bb 76 ed db | ...n..v...n..v..
    b7 6e dd bb 76 ed db b7 6e dd bb 76 ed db b7 6e | .n..v...n..v...n
    dd bb 76 ed db b7 6e dd bb 76 ed db b4 8d 09 0b | ..v...n..v......
    5f d2 37 f0 86 c4 4a 23 ef 0e 70 c7 2b 2f bb 61 | _.7...J#..p.+/.a
    7f 81                                           | ..
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '01'
        name_index:
            encoded: "01"
            decoded: 1
        value_data_length:
            encoded: "ffee02"
            decoded: 493
        value_data:
            is_huffman_encoded: 1
            encoded: "df7dfb3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3f\
    cff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fc\
    ff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3fcff3e3b69ecf\
    0fe7e1fd7f3d5fe7f7e5fd79f6f97cbbfe9b7fbfebcfb7cbbfe9b7fbf8f87f3f0febcfc\
    bb7bfe9b7e3fd79f6f977fd36ff7f1febb7e9b7fbf8fc7f9f0db4f67f5e7dbe5f4efdbf\
    df891a13f1db4f6787f3f0febf9eaff3fbf2febcfb7cbe5dff4dbfdff5e7dbe5dff4dbf\
    dfc7c3f9f87f5e7e5dbdff4dbf1febcfb7cbbfe9b7fbf8ff5dbf4dbfdfc7e3fcf86da7b\
    3faf3edf2fa77edfefc48d09f8eda7b3c3f9f87f5fcf57f9fdf97f5e7dbe5f2effa6dfe\
    ffaf3edf2effa6dfefe3e1fcfc3faf3f2edeffa6df8ff5e7dbe5dff4dbfdfc7faedfa6d\
    fefe3f1fe7c36d3d9fd79f6f97d3bf6ff7e24684fc76d3d9e1fcfc3fafe7abfcfefcbfa\
    f3edf2f977fd36ff7fd79f6f977fd36ff7f1f0fe7e1fd79f976f7fd36fc7faf3edf2eff\
    a6dfefe3fd76fd36ff7f1f8ff3e1b69ecfebcfb7cbe9dfb7fbf1234276eddbb76eddbb7\
    6eddbb76eddbb76eddbb76eddbb76eddbb76eddbb76eddbb76eddbb76eddbb76eddbb76\
    eddbb76eddbb76eddbb76eddbb76eddbb76eddbb48d090b5fd237f086c44a23ef0e70c7\
    2b2fbb617f"
            decoded: "foo=ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZZZZZZZLASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIU\
    AXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQ\
    WEOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOE\
    IUALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJK\
    HQWOEIUALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234AAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA1234max-age=3600; version=1\
    "
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '81'
        entry_index:
            encoded: "81"
            decoded: 1
    
    
    # Decoded header set
    :status: 200
    cache-control: private
    content-encoding: gzip
    date: Mon, 21 OCt 2013 20:13:22 GMT
    location: https://www.bar.com
    set-cookie: foo=ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZLASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUAXLQEU\
    AXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUA\
    XLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQW\
    EOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEI\
    UALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA1234 max-age=3600; version=1
    
    #########################
    
                            

    E.4. Response Decoding Example Without Huffman

    # Header set to be encoded
    :status: 302
    cache-control: private
    date: Mon, 21 OCt 2013 20:13:21 GMT
    location: : https://www.bar.com
    
    # Hexdump of encoded data which will be decoded
    08 03 33 30 32 18 07 70 72 69 76 61 74 65 22 1d | ..302..private".
    4d 6f 6e 2c 20 32 31 20 4f 43 74 20 32 30 31 33 | Mon, 21 OCt 2013
    20 32 30 3a 31 33 3a 32 31 20 47 4d 54 2f 15 3a |  20:13:21 GMT/.:
    20 68 74 74 70 73 3a 2f 2f 77 77 77 2e 62 61 72 |  https://www.bar
    2e 63 6f 6d                                     | .com
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '08'
        name_index:
            encoded: "08"
            decoded: 8
        value_data_length:
            encoded: "03"
            decoded: 3
        value_data:
            is_huffman_encoded: 0
            encoded: "333032"
            decoded: "302"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '18'
        name_index:
            encoded: "18"
            decoded: 24
        value_data_length:
            encoded: "07"
            decoded: 7
        value_data:
            is_huffman_encoded: 0
            encoded: "70726976617465"
            decoded: "private"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '22'
        name_index:
            encoded: "22"
            decoded: 34
        value_data_length:
            encoded: "1d"
            decoded: 29
        value_data:
            is_huffman_encoded: 0
            encoded: "4d6f6e2c203231204f437420323031332032303a31333a3231204\
    74d54"
            decoded: "Mon, 21 OCt 2013 20:13:21 GMT"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '2f'
        name_index:
            encoded: "2f"
            decoded: 47
        value_data_length:
            encoded: "15"
            decoded: 21
        value_data:
            is_huffman_encoded: 0
            encoded: "3a2068747470733a2f2f7777772e6261722e636f6d"
            decoded: ": https://www.bar.com"
    
    
    # Decoded header set
    :status: 302
    cache-control: private
    date: Mon, 21 OCt 2013 20:13:21 GMT
    location: : https://www.bar.com
    
    #########################
    
    # Header set to be encoded
    :status: 200
    cache-control: private
    date: Mon, 21 OCt 2013 20:13:22 GMT
    location: https://www.bar.com
    content-encoding: gzip
    set-cookie: foo=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAALASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUAXLQEU\
    AXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUA\
    XLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQW\
    EOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEI\
    UALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ1234 max-age=3600; version=1
    
    # Hexdump of encoded data which will be decoded
    04 03 32 30 30 03 1d 4d 6f 6e 2c 20 32 31 20 4f | ..200..Mon, 21 O
    43 74 20 32 30 31 33 20 32 30 3a 31 33 3a 32 32 | Ct 2013 20:13:22
    20 47 4d 54 03 13 68 74 74 70 73 3a 2f 2f 77 77 |  GMT..https://ww
    77 2e 62 61 72 2e 63 6f 6d 20 04 67 7a 69 70 3d | w.bar.com .gzip=
    7f e1 02 66 6f 6f 3d 41 41 41 41 41 41 41 41 41 | ...foo=AAAAAAAAA
    41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 | AAAAAAAAAAAAAAAA
    41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 | AAAAAAAAAAAAAAAA
    41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 | AAAAAAAAAAAAAAAA
    41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 4c | AAAAAAAAAAAAAAAL
    41 53 44 4a 4b 48 51 4b 42 5a 58 4f 51 57 45 4f | ASDJKHQKBZXOQWEO
    50 49 55 41 58 51 57 45 4f 49 55 41 58 4c 4a 4b | PIUAXQWEOIUAXLJK
    48 51 57 4f 45 49 55 41 4c 51 57 45 4f 49 55 41 | HQWOEIUALQWEOIUA
    58 4c 51 45 55 41 58 4c 4c 4b 4a 41 53 44 51 57 | XLQEUAXLLKJASDQW
    45 4f 55 49 41 58 4e 31 32 33 34 4c 41 53 44 4a | EOUIAXN1234LASDJ
    4b 48 51 4b 42 5a 58 4f 51 57 45 4f 50 49 55 41 | KHQKBZXOQWEOPIUA
    58 51 57 45 4f 49 55 41 58 4c 4a 4b 48 51 57 4f | XQWEOIUAXLJKHQWO
    45 49 55 41 4c 51 57 45 4f 49 55 41 58 4c 51 45 | EIUALQWEOIUAXLQE
    55 41 58 4c 4c 4b 4a 41 53 44 51 57 45 4f 55 49 | UAXLLKJASDQWEOUI
    41 58 4e 31 32 33 34 4c 41 53 44 4a 4b 48 51 4b | AXN1234LASDJKHQK
    42 5a 58 4f 51 57 45 4f 50 49 55 41 58 51 57 45 | BZXOQWEOPIUAXQWE
    4f 49 55 41 58 4c 4a 4b 48 51 57 4f 45 49 55 41 | OIUAXLJKHQWOEIUA
    4c 51 57 45 4f 49 55 41 58 4c 51 45 55 41 58 4c | LQWEOIUAXLQEUAXL
    4c 4b 4a 41 53 44 51 57 45 4f 55 49 41 58 4e 31 | LKJASDQWEOUIAXN1
    32 33 34 4c 41 53 44 4a 4b 48 51 4b 42 5a 58 4f | 234LASDJKHQKBZXO
    51 57 45 4f 50 49 55 41 58 51 57 45 4f 49 55 41 | QWEOPIUAXQWEOIUA
    58 4c 4a 4b 48 51 57 4f 45 49 55 41 4c 51 57 45 | XLJKHQWOEIUALQWE
    4f 49 55 41 58 4c 51 45 55 41 58 4c 4c 4b 4a 41 | OIUAXLQEUAXLLKJA
    53 44 51 57 45 4f 55 49 41 58 4e 31 32 33 34 5a | SDQWEOUIAXN1234Z
    5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a | ZZZZZZZZZZZZZZZZ
    5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a | ZZZZZZZZZZZZZZZZ
    5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a | ZZZZZZZZZZZZZZZZ
    5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a | ZZZZZZZZZZZZZZZZ
    5a 5a 5a 5a 5a 5a 5a 31 32 33 34 20 6d 61 78 2d | ZZZZZZZ1234 max-
    61 67 65 3d 33 36 30 30 3b 20 76 65 72 73 69 6f | age=3600; versio
    6e 3d 31 85 86 88                               | n=1...
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '04'
        name_index:
            encoded: "04"
            decoded: 4
        value_data_length:
            encoded: "03"
            decoded: 3
        value_data:
            is_huffman_encoded: 0
            encoded: "323030"
            decoded: "200"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '03'
        name_index:
            encoded: "03"
            decoded: 3
        value_data_length:
            encoded: "1d"
            decoded: 29
        value_data:
            is_huffman_encoded: 0
            encoded: "4d6f6e2c203231204f437420323031332032303a31333a3232204\
    74d54"
            decoded: "Mon, 21 OCt 2013 20:13:22 GMT"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '03'
        name_index:
            encoded: "03"
            decoded: 3
        value_data_length:
            encoded: "13"
            decoded: 19
        value_data:
            is_huffman_encoded: 0
            encoded: "68747470733a2f2f7777772e6261722e636f6d"
            decoded: "https://www.bar.com"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '20'
        name_index:
            encoded: "20"
            decoded: 32
        value_data_length:
            encoded: "04"
            decoded: 4
        value_data:
            is_huffman_encoded: 0
            encoded: "677a6970"
            decoded: "gzip"
    
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '3d'
        name_index:
            encoded: "3d"
            decoded: 61
        value_data_length:
            encoded: "7fe102"
            decoded: 480
        value_data:
            is_huffman_encoded: 0
            encoded: "666f6f3d414141414141414141414141414141414141414141414\
    14141414141414141414141414141414141414141414141414141414141414141414141\
    41414141414141414141414141414c4153444a4b48514b425a584f5157454f504955415\
    85157454f495541584c4a4b4851574f454955414c5157454f495541584c51455541584c\
    4c4b4a4153445157454f554941584e313233344c4153444a4b48514b425a584f5157454\
    f50495541585157454f495541584c4a4b4851574f454955414c5157454f495541584c51\
    455541584c4c4b4a4153445157454f554941584e313233344c4153444a4b48514b425a5\
    84f5157454f50495541585157454f495541584c4a4b4851574f454955414c5157454f49\
    5541584c51455541584c4c4b4a4153445157454f554941584e313233344c4153444a4b4\
    8514b425a584f5157454f50495541585157454f495541584c4a4b4851574f454955414c\
    5157454f495541584c51455541584c4c4b4a4153445157454f554941584e313233345a5\
    a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a\
    5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a3\
    1323334206d61782d6167653d333630303b2076657273696f6e3d31"
            decoded: "foo=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAAAAAAAALASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIU\
    AXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQ\
    WEOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOE\
    IUALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJK\
    HQWOEIUALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234ZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ1234max-age=3600; version=1\
    "
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '85'
        entry_index:
            encoded: "85"
            decoded: 5
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '86'
        entry_index:
            encoded: "86"
            decoded: 6
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '88'
        entry_index:
            encoded: "88"
            decoded: 8
    
    
    # Decoded header set
    :status: 200
    cache-control: private
    content-encoding: gzip
    date: Mon, 21 OCt 2013 20:13:22 GMT
    location: https://www.bar.com
    set-cookie: foo=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAALASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUAXLQEU\
    AXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUA\
    XLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQW\
    EOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEI\
    UALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ1234 max-age=3600; version=1
    
    #########################
    
    # Header set to be encoded
    :status: 200
    cache-control: private
    date: Mon, 21 OCt 2013 20:13:22 GMT
    location: https://www.bar.com
    content-encoding: gzip
    set-cookie: foo=ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZLASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUAXLQEU\
    AXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUA\
    XLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQW\
    EOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEI\
    UALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA1234 max-age=3600; version=1
    
    # Hexdump of encoded data which will be decoded
    01 7f e1 02 66 6f 6f 3d 5a 5a 5a 5a 5a 5a 5a 5a | ....foo=ZZZZZZZZ
    5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a | ZZZZZZZZZZZZZZZZ
    5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a | ZZZZZZZZZZZZZZZZ
    5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a | ZZZZZZZZZZZZZZZZ
    5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a | ZZZZZZZZZZZZZZZZ
    4c 41 53 44 4a 4b 48 51 4b 42 5a 58 4f 51 57 45 | LASDJKHQKBZXOQWE
    4f 50 49 55 41 58 51 57 45 4f 49 55 41 58 4c 4a | OPIUAXQWEOIUAXLJ
    4b 48 51 57 4f 45 49 55 41 4c 51 57 45 4f 49 55 | KHQWOEIUALQWEOIU
    41 58 4c 51 45 55 41 58 4c 4c 4b 4a 41 53 44 51 | AXLQEUAXLLKJASDQ
    57 45 4f 55 49 41 58 4e 31 32 33 34 4c 41 53 44 | WEOUIAXN1234LASD
    4a 4b 48 51 4b 42 5a 58 4f 51 57 45 4f 50 49 55 | JKHQKBZXOQWEOPIU
    41 58 51 57 45 4f 49 55 41 58 4c 4a 4b 48 51 57 | AXQWEOIUAXLJKHQW
    4f 45 49 55 41 4c 51 57 45 4f 49 55 41 58 4c 51 | OEIUALQWEOIUAXLQ
    45 55 41 58 4c 4c 4b 4a 41 53 44 51 57 45 4f 55 | EUAXLLKJASDQWEOU
    49 41 58 4e 31 32 33 34 4c 41 53 44 4a 4b 48 51 | IAXN1234LASDJKHQ
    4b 42 5a 58 4f 51 57 45 4f 50 49 55 41 58 51 57 | KBZXOQWEOPIUAXQW
    45 4f 49 55 41 58 4c 4a 4b 48 51 57 4f 45 49 55 | EOIUAXLJKHQWOEIU
    41 4c 51 57 45 4f 49 55 41 58 4c 51 45 55 41 58 | ALQWEOIUAXLQEUAX
    4c 4c 4b 4a 41 53 44 51 57 45 4f 55 49 41 58 4e | LLKJASDQWEOUIAXN
    31 32 33 34 4c 41 53 44 4a 4b 48 51 4b 42 5a 58 | 1234LASDJKHQKBZX
    4f 51 57 45 4f 50 49 55 41 58 51 57 45 4f 49 55 | OQWEOPIUAXQWEOIU
    41 58 4c 4a 4b 48 51 57 4f 45 49 55 41 4c 51 57 | AXLJKHQWOEIUALQW
    45 4f 49 55 41 58 4c 51 45 55 41 58 4c 4c 4b 4a | EOIUAXLQEUAXLLKJ
    41 53 44 51 57 45 4f 55 49 41 58 4e 31 32 33 34 | ASDQWEOUIAXN1234
    41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 | AAAAAAAAAAAAAAAA
    41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 | AAAAAAAAAAAAAAAA
    41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 | AAAAAAAAAAAAAAAA
    41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 | AAAAAAAAAAAAAAAA
    41 41 41 41 41 41 41 41 31 32 33 34 20 6d 61 78 | AAAAAAAA1234 max
    2d 61 67 65 3d 33 36 30 30 3b 20 76 65 72 73 69 | -age=3600; versi
    6f 6e 3d 31 81                                  | on=1.
    
    # Decoded opcodes
    LITERAL_INCREMENTAL_OPCODE:
            opcodeLengthInBits: 2
            discoveredFromPeekingAtByte: '01'
        name_index:
            encoded: "01"
            decoded: 1
        value_data_length:
            encoded: "7fe102"
            decoded: 480
        value_data:
            is_huffman_encoded: 0
            encoded: "666f6f3d5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5\
    a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a\
    5a5a5a5a5a5a5a5a5a5a5a5a5a5a4c4153444a4b48514b425a584f5157454f504955415\
    85157454f495541584c4a4b4851574f454955414c5157454f495541584c51455541584c\
    4c4b4a4153445157454f554941584e313233344c4153444a4b48514b425a584f5157454\
    f50495541585157454f495541584c4a4b4851574f454955414c5157454f495541584c51\
    455541584c4c4b4a4153445157454f554941584e313233344c4153444a4b48514b425a5\
    84f5157454f50495541585157454f495541584c4a4b4851574f454955414c5157454f49\
    5541584c51455541584c4c4b4a4153445157454f554941584e313233344c4153444a4b4\
    8514b425a584f5157454f50495541585157454f495541584c4a4b4851574f454955414c\
    5157454f495541584c51455541584c4c4b4a4153445157454f554941584e31323334414\
    14141414141414141414141414141414141414141414141414141414141414141414141\
    41414141414141414141414141414141414141414141414141414141414141414141413\
    1323334206d61782d6167653d333630303b2076657273696f6e3d31"
            decoded: "foo=ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZZZZZZZLASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIU\
    AXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQ\
    WEOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOE\
    IUALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJK\
    HQWOEIUALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234AAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA1234max-age=3600; version=1\
    "
    
    INDEX_OPCODE:
            opcodeLengthInBits: 1
            discoveredFromPeekingAtByte: '81'
        entry_index:
            encoded: "81"
            decoded: 1
    
    
    # Decoded header set
    :status: 200
    cache-control: private
    content-encoding: gzip
    date: Mon, 21 OCt 2013 20:13:22 GMT
    location: https://www.bar.com
    set-cookie: foo=ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ\
    ZZZZZZZZZZZZZZZZZLASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUAXLQEU\
    AXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQWEOIUA\
    XLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEIUALQW\
    EOIUAXLQEUAXLLKJASDQWEOUIAXN1234LASDJKHQKBZXOQWEOPIUAXQWEOIUAXLJKHQWOEI\
    UALQWEOIUAXLQEUAXLLKJASDQWEOUIAXN1234AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA1234 max-age=3600; version=1
    
    #########################
    
                          

    Authors' Addresses

    Roberto Peon
    Google, Inc
    Email: fenix@google.com
    Hervé Ruellan
    Canon CRF
    Email: herve.ruellan@crf.canon.fr