draft-ietf-httpbis-p4-conditional-14.txt   draft-ietf-httpbis-p4-conditional-15.txt 
HTTPbis Working Group R. Fielding, Ed. HTTPbis Working Group R. Fielding, Ed.
Internet-Draft Adobe Internet-Draft Adobe
Obsoletes: 2616 (if approved) J. Gettys Obsoletes: 2616 (if approved) J. Gettys
Intended status: Standards Track Alcatel-Lucent Intended status: Standards Track Alcatel-Lucent
Expires: October 20, 2011 J. Mogul Expires: January 12, 2012 J. Mogul
HP HP
H. Frystyk H. Frystyk
Microsoft Microsoft
L. Masinter L. Masinter
Adobe Adobe
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
April 18, 2011 July 11, 2011
HTTP/1.1, part 4: Conditional Requests HTTP/1.1, part 4: Conditional Requests
draft-ietf-httpbis-p4-conditional-14 draft-ietf-httpbis-p4-conditional-15
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
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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), which is archived at group mailing list (ietf-http-wg@w3.org), which is archived at
<http://lists.w3.org/Archives/Public/ietf-http-wg/>. <http://lists.w3.org/Archives/Public/ietf-http-wg/>.
The current issues list is at The current issues list is at
<http://tools.ietf.org/wg/httpbis/trac/report/3> and related <http://tools.ietf.org/wg/httpbis/trac/report/3> 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.15. The changes in this draft are summarized in Appendix C.16.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted 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). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
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."
This Internet-Draft will expire on October 20, 2011. This Internet-Draft will expire on January 12, 2012.
Copyright Notice Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the Copyright (c) 2011 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
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C.6. Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . 23 C.6. Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . 23
C.7. Since draft-ietf-httpbis-p4-conditional-05 . . . . . . . . 24 C.7. Since draft-ietf-httpbis-p4-conditional-05 . . . . . . . . 24
C.8. Since draft-ietf-httpbis-p4-conditional-06 . . . . . . . . 24 C.8. Since draft-ietf-httpbis-p4-conditional-06 . . . . . . . . 24
C.9. Since draft-ietf-httpbis-p4-conditional-07 . . . . . . . . 24 C.9. Since draft-ietf-httpbis-p4-conditional-07 . . . . . . . . 24
C.10. Since draft-ietf-httpbis-p4-conditional-08 . . . . . . . . 24 C.10. Since draft-ietf-httpbis-p4-conditional-08 . . . . . . . . 24
C.11. Since draft-ietf-httpbis-p4-conditional-09 . . . . . . . . 24 C.11. Since draft-ietf-httpbis-p4-conditional-09 . . . . . . . . 24
C.12. Since draft-ietf-httpbis-p4-conditional-10 . . . . . . . . 24 C.12. Since draft-ietf-httpbis-p4-conditional-10 . . . . . . . . 24
C.13. Since draft-ietf-httpbis-p4-conditional-11 . . . . . . . . 25 C.13. Since draft-ietf-httpbis-p4-conditional-11 . . . . . . . . 25
C.14. Since draft-ietf-httpbis-p4-conditional-12 . . . . . . . . 25 C.14. Since draft-ietf-httpbis-p4-conditional-12 . . . . . . . . 25
C.15. Since draft-ietf-httpbis-p4-conditional-13 . . . . . . . . 25 C.15. Since draft-ietf-httpbis-p4-conditional-13 . . . . . . . . 25
C.16. Since draft-ietf-httpbis-p4-conditional-14 . . . . . . . . 25
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1. Introduction 1. Introduction
This document defines the HTTP/1.1 conditional request mechanisms, This document defines the HTTP/1.1 conditional request mechanisms,
including both response metadata that can be used to indicate or including both response metadata that can be used to indicate or
observe changes to resource state and request header fields that observe changes to resource state and request header fields that
specify preconditions to be checked before performing the action specify preconditions to be checked before performing the action
given by the request method. Conditional GET requests are the most given by the request method. Conditional GET requests are the most
efficient mechanism for HTTP cache updates [Part6]. Conditionals can efficient mechanism for HTTP cache updates [Part6]. Conditionals can
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7. Acknowledgments 7. Acknowledgments
8. References 8. References
8.1. Normative References 8.1. 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-14 and Message Parsing", draft-ietf-httpbis-p1-messaging-15
(work in progress), April 2011. (work in progress), July 2011.
[Part3] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H., [Part3] 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 3: Message Payload and J. Reschke, Ed., "HTTP/1.1, part 3: Message Payload
and Content Negotiation", draft-ietf-httpbis-p3-payload-14 and Content Negotiation", draft-ietf-httpbis-p3-payload-15
(work in progress), April 2011. (work in progress), July 2011.
[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-14 (work Partial Responses", draft-ietf-httpbis-p5-range-15 (work
in progress), April 2011. in progress), July 2011.
[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-14 (work in 6: Caching", draft-ietf-httpbis-p6-cache-15 (work in
progress), April 2011. progress), July 2011.
[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.
8.2. Informative References 8.2. Informative References
[RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H., [RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,
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o <http://tools.ietf.org/wg/httpbis/trac/ticket/101>: "Definition of o <http://tools.ietf.org/wg/httpbis/trac/ticket/101>: "Definition of
validator weakness" validator weakness"
o <http://tools.ietf.org/wg/httpbis/trac/ticket/276>: "untangle o <http://tools.ietf.org/wg/httpbis/trac/ticket/276>: "untangle
ABNFs for header fields" ABNFs for header fields"
o <http://tools.ietf.org/wg/httpbis/trac/ticket/269>: "ETags and o <http://tools.ietf.org/wg/httpbis/trac/ticket/269>: "ETags and
Quotes" Quotes"
C.16. Since draft-ietf-httpbis-p4-conditional-14
None.
Index Index
3 3
304 Not Modified (status code) 18 304 Not Modified (status code) 18
4 4
412 Precondition Failed (status code) 19 412 Precondition Failed (status code) 19
E E
ETag header field 8 ETag header field 8
 End of changes. 11 change blocks. 
13 lines changed or deleted 18 lines changed or added

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