draft-ietf-httpbis-p4-conditional-09.txt   draft-ietf-httpbis-p4-conditional-latest.txt 
HTTPbis Working Group R. Fielding, Ed. HTTPbis Working Group R. Fielding, Ed.
Internet-Draft Day Software Internet-Draft Day Software
Obsoletes: 2616 (if approved) J. Gettys Obsoletes: 2616 (if approved) J. Gettys
Intended status: Standards Track One Laptop per Child Intended status: Standards Track One Laptop per Child
Expires: September 9, 2010 J. Mogul Expires: September 12, 2010 J. Mogul
HP HP
H. Frystyk H. Frystyk
Microsoft Microsoft
L. Masinter L. Masinter
Adobe Systems Adobe Systems
P. Leach P. Leach
Microsoft Microsoft
T. Berners-Lee T. Berners-Lee
W3C/MIT W3C/MIT
Y. Lafon, Ed. Y. Lafon, Ed.
W3C W3C
J. Reschke, Ed. J. Reschke, Ed.
greenbytes greenbytes
March 8, 2010 March 11, 2010
HTTP/1.1, part 4: Conditional Requests HTTP/1.1, part 4: Conditional Requests
draft-ietf-httpbis-p4-conditional-09 draft-ietf-httpbis-p4-conditional-latest
Abstract Abstract
The Hypertext Transfer Protocol (HTTP) is an application-level The Hypertext Transfer Protocol (HTTP) is an application-level
protocol for distributed, collaborative, hypermedia information protocol for distributed, collaborative, hypermedia information
systems. HTTP has been in use by the World Wide Web global systems. HTTP has been in use by the World Wide Web global
information initiative since 1990. This document is Part 4 of the information initiative since 1990. This document is Part 4 of the
seven-part specification that defines the protocol referred to as seven-part specification that defines the protocol referred to as
"HTTP/1.1" and, taken together, obsoletes RFC 2616. Part 4 defines "HTTP/1.1" and, taken together, obsoletes RFC 2616. Part 4 defines
request header fields for indicating conditional requests and the request header fields for indicating conditional requests and the
rules for constructing responses to those requests. rules for constructing responses to those requests.
Editorial Note (To be removed by RFC Editor) Editorial Note (To be removed by RFC Editor)
Discussion of this draft should take place on the HTTPBIS working Discussion of this draft should take place on the HTTPBIS working
group mailing list (ietf-http-wg@w3.org). The current issues list is group mailing list (ietf-http-wg@w3.org). The current issues list is
at <http://tools.ietf.org/wg/httpbis/trac/report/11> and related at <http://tools.ietf.org/wg/httpbis/trac/report/11> and related
documents (including fancy diffs) can be found at documents (including fancy diffs) can be found at
<http://tools.ietf.org/wg/httpbis/>. <http://tools.ietf.org/wg/httpbis/>.
The changes in this draft are summarized in Appendix C.10. The changes in this draft are summarized in Appendix C.11.
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
skipping to change at page 2, line 22 skipping to change at page 2, line 22
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt. http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
This Internet-Draft will expire on September 9, 2010. This Internet-Draft will expire on September 12, 2010.
Copyright Notice Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the Copyright (c) 2010 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
skipping to change at page 3, line 49 skipping to change at page 3, line 49
C.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 20 C.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 20
C.2. Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 21 C.2. Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 21
C.3. Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . 21 C.3. Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . 21
C.4. Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . 21 C.4. Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . 21
C.5. Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . 21 C.5. Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . 21
C.6. Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . 22 C.6. Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . 22
C.7. Since draft-ietf-httpbis-p4-conditional-05 . . . . . . . . 22 C.7. Since draft-ietf-httpbis-p4-conditional-05 . . . . . . . . 22
C.8. Since draft-ietf-httpbis-p4-conditional-06 . . . . . . . . 22 C.8. Since draft-ietf-httpbis-p4-conditional-06 . . . . . . . . 22
C.9. Since draft-ietf-httpbis-p4-conditional-07 . . . . . . . . 22 C.9. Since draft-ietf-httpbis-p4-conditional-07 . . . . . . . . 22
C.10. Since draft-ietf-httpbis-p4-conditional-08 . . . . . . . . 22 C.10. Since draft-ietf-httpbis-p4-conditional-08 . . . . . . . . 22
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 C.11. Since draft-ietf-httpbis-p4-conditional-09 . . . . . . . . 22
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 24 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 24
1. Introduction 1. Introduction
This document defines HTTP/1.1 response metadata for indicating This document defines HTTP/1.1 response metadata for indicating
potential changes to payload content, including modification time potential changes to payload content, including modification time
stamps and opaque entity-tags, and the HTTP conditional request stamps and opaque entity-tags, and the HTTP conditional request
mechanisms that allow preconditions to be placed on a request method. mechanisms that allow preconditions to be placed on a request method.
Conditional GET requests allow for efficient cache updates. Other Conditional GET requests allow for efficient cache updates. Other
conditional request methods are used to protect against overwriting conditional request methods are used to protect against overwriting
skipping to change at page 18, line 46 skipping to change at page 18, line 46
9. Acknowledgments 9. Acknowledgments
10. References 10. References
10.1. Normative References 10.1. Normative References
[Part1] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H., [Part1] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed., Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,
and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections, and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections,
and Message Parsing", draft-ietf-httpbis-p1-messaging-09 and Message Parsing",
(work in progress), March 2010. draft-ietf-httpbis-p1-messaging-latest (work in progress),
March 2010.
[Part5] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H., [Part5] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed., Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,
and J. Reschke, Ed., "HTTP/1.1, part 5: Range Requests and and J. Reschke, Ed., "HTTP/1.1, part 5: Range Requests and
Partial Responses", draft-ietf-httpbis-p5-range-09 (work Partial Responses", draft-ietf-httpbis-p5-range-latest
in progress), March 2010. (work in progress), March 2010.
[Part6] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H., [Part6] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed., Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,
Nottingham, M., Ed., and J. Reschke, Ed., "HTTP/1.1, part Nottingham, M., Ed., and J. Reschke, Ed., "HTTP/1.1, part
6: Caching", draft-ietf-httpbis-p6-cache-09 (work in 6: Caching", draft-ietf-httpbis-p6-cache-latest (work in
progress), March 2010. progress), March 2010.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997. Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax [RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234, January 2008. Specifications: ABNF", STD 68, RFC 5234, January 2008.
10.2. Informative References 10.2. Informative References
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non-GET requests" (If-Match still was defined to require strong non-GET requests" (If-Match still was defined to require strong
matching) matching)
o <http://tools.ietf.org/wg/httpbis/trac/ticket/198>: "move IANA o <http://tools.ietf.org/wg/httpbis/trac/ticket/198>: "move IANA
registrations for optional status codes" registrations for optional status codes"
C.10. Since draft-ietf-httpbis-p4-conditional-08 C.10. Since draft-ietf-httpbis-p4-conditional-08
No significant changes. No significant changes.
C.11. Since draft-ietf-httpbis-p4-conditional-09
None yet.
Index Index
3 3
304 Not Modified (status code) 6 304 Not Modified (status code) 6
4 4
412 Precondition Failed (status code) 6 412 Precondition Failed (status code) 6
E E
ETag header 11 ETag header 11
 End of changes. 10 change blocks. 
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