Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests
draft-ietf-httpbis-p4-conditional-25
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Active Internet-Draft (httpbis WG)
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2013-12-19
(latest revision 2013-11-17)
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IETF
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Proposed Standard
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Submitted to IESG for Publication
Sep 2013
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Document shepherd |
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Mark Nottingham
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Shepherd write-up |
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(last changed 2013-10-07)
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Approved-announcement to be sent::Point Raised - writeup needed
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Barry Leiba
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httpbis-chairs@tools.ietf.org, draft-ietf-httpbis-p4-conditional@tools.ietf.org
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HTTPbis Working Group R. Fielding, Ed.
Internet-Draft Adobe
Obsoletes: 2616 (if approved) J. Reschke, Ed.
Intended status: Standards Track greenbytes
Expires: May 21, 2014 November 17, 2013
Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests
draft-ietf-httpbis-p4-conditional-25
Abstract
The Hypertext Transfer Protocol (HTTP) is an application-level
protocol for distributed, collaborative, hypertext information
systems. This document defines HTTP/1.1 conditional requests,
including metadata header fields for indicating state changes,
request header fields for making preconditions on such state, and
rules for constructing the responses to a conditional request when
one or more preconditions evaluate to false.
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/>.
The current issues list is at
<http://tools.ietf.org/wg/httpbis/trac/report/3> and related
documents (including fancy diffs) can be found at
<http://tools.ietf.org/wg/httpbis/>.
The changes in this draft are summarized in Appendix D.1.
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
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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."
Fielding & Reschke Expires May 21, 2014 [Page 1]
Internet-Draft HTTP/1.1 Conditional Requests November 2013
This Internet-Draft will expire on May 21, 2014.
Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
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This document is subject to BCP 78 and the IETF Trust's Legal
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Fielding & Reschke Expires May 21, 2014 [Page 2]
Internet-Draft HTTP/1.1 Conditional Requests November 2013
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Conformance and Error Handling . . . . . . . . . . . . . . 4
1.2. Syntax Notation . . . . . . . . . . . . . . . . . . . . . 4
2. Validators . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1. Weak versus Strong . . . . . . . . . . . . . . . . . . . . 5
2.2. Last-Modified . . . . . . . . . . . . . . . . . . . . . . 7
2.2.1. Generation . . . . . . . . . . . . . . . . . . . . . . 7
2.2.2. Comparison . . . . . . . . . . . . . . . . . . . . . . 8
2.3. ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3.1. Generation . . . . . . . . . . . . . . . . . . . . . . 9
2.3.2. Comparison . . . . . . . . . . . . . . . . . . . . . . 10
2.3.3. Example: Entity-tags Varying on Content-Negotiated
Resources . . . . . . . . . . . . . . . . . . . . . . 11
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