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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