draft-ietf-httpbis-p5-range-14.txt		draft-ietf-httpbis-p5-range-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 5: Range Requests and Partial Responses		HTTP/1.1, part 5: Range Requests and Partial Responses
	draft-ietf-httpbis-p5-range-14		draft-ietf-httpbis-p5-range-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 5 of the		information initiative since 1990. This document is Part 5 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 5 defines		"HTTP/1.1" and, taken together, obsoletes RFC 2616. Part 5 defines
	range-specific requests and the rules for constructing and combining		range-specific requests and the rules for constructing and combining
	skipping to change at page 1, line 48		skipping to change at page 1, line 48
	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 D.15.		The changes in this draft are summarized in Appendix D.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
	skipping to change at page 2, line 51		skipping to change at page 2, line 51
	modifications of such material outside the IETF Standards Process.		modifications of such material outside the IETF Standards Process.
	Without obtaining an adequate license from the person(s) controlling		Without obtaining an adequate license from the person(s) controlling
	the copyright in such materials, this document may not be modified		the copyright in such materials, this document may not be modified
	outside the IETF Standards Process, and derivative works of it may		outside the IETF Standards Process, and derivative works of it may
	not be created outside the IETF Standards Process, except to format		not be created outside the IETF Standards Process, except to format
	it for publication as an RFC or to translate it into languages other		it for publication as an RFC or to translate it into languages other
	than English.		than English.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4		1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 5
	1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 4		1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 5
	1.2. Syntax Notation . . . . . . . . . . . . . . . . . . . . . 4		1.2. Syntax Notation . . . . . . . . . . . . . . . . . . . . . 5
	1.2.1. Core Rules . . . . . . . . . . . . . . . . . . . . . . 5		1.2.1. Core Rules . . . . . . . . . . . . . . . . . . . . . . 6
	1.2.2. ABNF Rules defined in other Parts of the		1.2.2. ABNF Rules defined in other Parts of the
	Specification . . . . . . . . . . . . . . . . . . . . 5		Specification . . . . . . . . . . . . . . . . . . . . 6
	2. Range Units . . . . . . . . . . . . . . . . . . . . . . . . . 5		2. Range Units . . . . . . . . . . . . . . . . . . . . . . . . . 6
	2.1. Range Specifier Registry . . . . . . . . . . . . . . . . . 5		2.1. Range Specifier Registry . . . . . . . . . . . . . . . . . 6
	3. Status Code Definitions . . . . . . . . . . . . . . . . . . . 6		3. Status Code Definitions . . . . . . . . . . . . . . . . . . . 7
	3.1. 206 Partial Content . . . . . . . . . . . . . . . . . . . 6		3.1. 206 Partial Content . . . . . . . . . . . . . . . . . . . 7
	3.2. 416 Requested Range Not Satisfiable . . . . . . . . . . . 7		3.2. 416 Requested Range Not Satisfiable . . . . . . . . . . . 8
	4. Combining Ranges . . . . . . . . . . . . . . . . . . . . . . . 7		4. Combining Ranges . . . . . . . . . . . . . . . . . . . . . . . 8
	5. Header Field Definitions . . . . . . . . . . . . . . . . . . . 7		5. Header Field Definitions . . . . . . . . . . . . . . . . . . . 8
	5.1. Accept-Ranges . . . . . . . . . . . . . . . . . . . . . . 8		5.1. Accept-Ranges . . . . . . . . . . . . . . . . . . . . . . 9
	5.2. Content-Range . . . . . . . . . . . . . . . . . . . . . . 8		5.2. Content-Range . . . . . . . . . . . . . . . . . . . . . . 9
	5.3. If-Range . . . . . . . . . . . . . . . . . . . . . . . . . 10		5.3. If-Range . . . . . . . . . . . . . . . . . . . . . . . . . 11
	5.4. Range . . . . . . . . . . . . . . . . . . . . . . . . . . 11		5.4. Range . . . . . . . . . . . . . . . . . . . . . . . . . . 12
	5.4.1. Byte Ranges . . . . . . . . . . . . . . . . . . . . . 11		5.4.1. Byte Ranges . . . . . . . . . . . . . . . . . . . . . 12
	5.4.2. Range Retrieval Requests . . . . . . . . . . . . . . . 13		5.4.2. Range Retrieval Requests . . . . . . . . . . . . . . . 14
	6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14		6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
	6.1. Status Code Registration . . . . . . . . . . . . . . . . . 14		6.1. Status Code Registration . . . . . . . . . . . . . . . . . 15
	6.2. Header Field Registration . . . . . . . . . . . . . . . . 14		6.2. Header Field Registration . . . . . . . . . . . . . . . . 15
	6.3. Range Specifier Registration . . . . . . . . . . . . . . . 15		6.3. Range Specifier Registration . . . . . . . . . . . . . . . 16
	7. Security Considerations . . . . . . . . . . . . . . . . . . . 15		7. Security Considerations . . . . . . . . . . . . . . . . . . . 16
	8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 15		8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 16
	9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16		9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 17
	9.1. Normative References . . . . . . . . . . . . . . . . . . . 16		9.1. Normative References . . . . . . . . . . . . . . . . . . . 17
	9.2. Informative References . . . . . . . . . . . . . . . . . . 16		9.2. Informative References . . . . . . . . . . . . . . . . . . 17
	Appendix A. Internet Media Type multipart/byteranges . . . . . . 16		Appendix A. Internet Media Type multipart/byteranges . . . . . . 17
	Appendix B. Compatibility with Previous Versions . . . . . . . . 19		Appendix B. Compatibility with Previous Versions . . . . . . . . 20
	B.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 19		B.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 20
	Appendix C. Collected ABNF . . . . . . . . . . . . . . . . . . . 19		Appendix C. Collected ABNF . . . . . . . . . . . . . . . . . . . 20
	Appendix D. Change Log (to be removed by RFC Editor before		Appendix D. Change Log (to be removed by RFC Editor before
	publication) . . . . . . . . . . . . . . . . . . . . 21		publication) . . . . . . . . . . . . . . . . . . . . 22
	D.1. Since RFC 2616 . . . . . . . . . . . . . . . . . . . . . . 21		D.1. Since RFC 2616 . . . . . . . . . . . . . . . . . . . . . . 22
	D.2. Since draft-ietf-httpbis-p5-range-00 . . . . . . . . . . . 21		D.2. Since draft-ietf-httpbis-p5-range-00 . . . . . . . . . . . 22
	D.3. Since draft-ietf-httpbis-p5-range-01 . . . . . . . . . . . 21		D.3. Since draft-ietf-httpbis-p5-range-01 . . . . . . . . . . . 22
	D.4. Since draft-ietf-httpbis-p5-range-02 . . . . . . . . . . . 21		D.4. Since draft-ietf-httpbis-p5-range-02 . . . . . . . . . . . 22
	D.5. Since draft-ietf-httpbis-p5-range-03 . . . . . . . . . . . 22		D.5. Since draft-ietf-httpbis-p5-range-03 . . . . . . . . . . . 23
	D.6. Since draft-ietf-httpbis-p5-range-04 . . . . . . . . . . . 22		D.6. Since draft-ietf-httpbis-p5-range-04 . . . . . . . . . . . 23
	D.7. Since draft-ietf-httpbis-p5-range-05 . . . . . . . . . . . 22		D.7. Since draft-ietf-httpbis-p5-range-05 . . . . . . . . . . . 23
	D.8. Since draft-ietf-httpbis-p5-range-06 . . . . . . . . . . . 22		D.8. Since draft-ietf-httpbis-p5-range-06 . . . . . . . . . . . 23
	D.9. Since draft-ietf-httpbis-p5-range-07 . . . . . . . . . . . 23		D.9. Since draft-ietf-httpbis-p5-range-07 . . . . . . . . . . . 24
	D.10. Since draft-ietf-httpbis-p5-range-08 . . . . . . . . . . . 23		D.10. Since draft-ietf-httpbis-p5-range-08 . . . . . . . . . . . 24
	D.11. Since draft-ietf-httpbis-p5-range-09 . . . . . . . . . . . 23		D.11. Since draft-ietf-httpbis-p5-range-09 . . . . . . . . . . . 24
	D.12. Since draft-ietf-httpbis-p5-range-10 . . . . . . . . . . . 23		D.12. Since draft-ietf-httpbis-p5-range-10 . . . . . . . . . . . 24
	D.13. Since draft-ietf-httpbis-p5-range-11 . . . . . . . . . . . 23		D.13. Since draft-ietf-httpbis-p5-range-11 . . . . . . . . . . . 24
	D.14. Since draft-ietf-httpbis-p5-range-12 . . . . . . . . . . . 24		D.14. Since draft-ietf-httpbis-p5-range-12 . . . . . . . . . . . 25
	D.15. Since draft-ietf-httpbis-p5-range-13 . . . . . . . . . . . 24		D.15. Since draft-ietf-httpbis-p5-range-13 . . . . . . . . . . . 25
	Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24		D.16. Since draft-ietf-httpbis-p5-range-14 . . . . . . . . . . . 25
			Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
	1. Introduction		1. Introduction
	HTTP clients often encounter interrupted data transfers as a result		HTTP clients often encounter interrupted data transfers as a result
	of cancelled requests or dropped connections. When a cache has		of cancelled requests or dropped connections. When a cache has
	stored a partial representation, it is desirable to request the		stored a partial representation, it is desirable to request the
	remainder of that representation in a subsequent request rather than		remainder of that representation in a subsequent request rather than
	transfer the entire representation. There are also a number of Web		transfer the entire representation. There are also a number of Web
	applications that benefit from being able to request only a subset of		applications that benefit from being able to request only a subset of
	a larger representation, such as a single page of a very large		a larger representation, such as a single page of a very large
	skipping to change at page 16, line 9		skipping to change at page 17, line 9
	Hamilton, Koen Holtman, Shel Kaplan, Paul Leach, Alex Lopez-Ortiz,		Hamilton, Koen Holtman, Shel Kaplan, Paul Leach, Alex Lopez-Ortiz,
	Larry Masinter, Jeff Mogul, Lou Montulli, David W. Morris, Luigi		Larry Masinter, Jeff Mogul, Lou Montulli, David W. Morris, Luigi
	Rizzo, and Bill Weihl.		Rizzo, and Bill Weihl.
	9. References		9. References
	9.1. Normative References		9.1. 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.
	[Part4] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,		[Part4] 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 4: Conditional		and J. Reschke, Ed., "HTTP/1.1, part 4: Conditional
	Requests", draft-ietf-httpbis-p4-conditional-14 (work in		Requests", draft-ietf-httpbis-p4-conditional-15 (work in
	progress), April 2011.		progress), July 2011.
	[RFC2046] Freed, N. and N. Borenstein, "Multipurpose Internet Mail		[RFC2046] Freed, N. and N. Borenstein, "Multipurpose Internet Mail
	Extensions (MIME) Part Two: Media Types", RFC 2046,		Extensions (MIME) Part Two: Media Types", RFC 2046,
	November 1996.		November 1996.
	[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.
	skipping to change at page 24, line 19		skipping to change at page 25, line 19
	o <http://tools.ietf.org/wg/httpbis/trac/ticket/224>: "Header		o <http://tools.ietf.org/wg/httpbis/trac/ticket/224>: "Header
	Classification"		Classification"
	D.15. Since draft-ietf-httpbis-p5-range-13		D.15. Since draft-ietf-httpbis-p5-range-13
	Closed issues:		Closed issues:
	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"
			D.16. Since draft-ietf-httpbis-p5-range-14
			None.
	Index		Index
	2		2
	206 Partial Content (status code) 6		206 Partial Content (status code) 7
	4		4
	416 Requested Range Not Satisfiable (status code) 7		416 Requested Range Not Satisfiable (status code) 8
	A		A
	Accept-Ranges header field 8		Accept-Ranges header field 9
	C		C
	Content-Range header field 8		Content-Range header field 9
	G		G
	Grammar		Grammar
	Accept-Ranges 8		Accept-Ranges 9
	acceptable-ranges 8		acceptable-ranges 9
	byte-content-range-spec 8		byte-content-range-spec 9
	byte-range-resp-spec 8		byte-range-resp-spec 9
	byte-range-set 12		byte-range-set 13
	byte-range-spec 12		byte-range-spec 13
	byte-ranges-specifier 12		byte-ranges-specifier 13
	bytes-unit 5		bytes-unit 6
	Content-Range 8		Content-Range 9
	content-range-spec 8		content-range-spec 9
	first-byte-pos 12		first-byte-pos 13
	If-Range 11		If-Range 12
	instance-length 8		instance-length 9
	last-byte-pos 12		last-byte-pos 13
	other-range-unit 5		other-range-unit 6
	Range 13		Range 14
	range-unit 5		range-unit 6
	ranges-specifier 12		ranges-specifier 13
	suffix-byte-range-spec 12		suffix-byte-range-spec 13
	suffix-length 12		suffix-length 13
	H		H
	Header Fields		Header Fields
	Accept-Ranges 8		Accept-Ranges 9
	Content-Range 8		Content-Range 9
	If-Range 10		If-Range 11
	Range 11		Range 12
	I		I
	If-Range header field 10		If-Range header field 11
	M		M
	Media Type		Media Type
	multipart/byteranges 16		multipart/byteranges 17
	multipart/x-byteranges 19		multipart/x-byteranges 20
	multipart/byteranges Media Type 16		multipart/byteranges Media Type 17
	multipart/x-byteranges Media Type 19		multipart/x-byteranges Media Type 20
	R		R
	Range header field 11		Range header field 12
	S		S
	Status Codes		Status Codes
	206 Partial Content 6		206 Partial Content 7
	416 Requested Range Not Satisfiable 7		416 Requested Range Not Satisfiable 8
	Authors' Addresses		Authors' Addresses
	Roy T. Fielding (editor)		Roy T. Fielding (editor)
	Adobe Systems Incorporated		Adobe Systems Incorporated
	345 Park Ave		345 Park Ave
	San Jose, CA 95110		San Jose, CA 95110
	USA		USA
	EMail: fielding@gbiv.com		EMail: fielding@gbiv.com
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