draft-ietf-httpbis-p3-payload-07.txt   draft-ietf-httpbis-p3-payload-08.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: January 14, 2010 J. Mogul Expires: April 29, 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
July 13, 2009 October 26, 2009
HTTP/1.1, part 3: Message Payload and Content Negotiation HTTP/1.1, part 3: Message Payload and Content Negotiation
draft-ietf-httpbis-p3-payload-07 draft-ietf-httpbis-p3-payload-08
Status of this Memo Status of this Memo
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IETF Standards Process. Without obtaining an adequate license from IETF Standards Process. Without obtaining an adequate license from
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Copyright Notice Copyright Notice
Copyright (c) 2009 IETF Trust and the persons identified as the Copyright (c) 2009 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 in effect on the date of Provisions Relating to IETF Documents in effect on the date of
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Please review these documents carefully, as they describe your rights Please review these documents carefully, as they describe your rights
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HTTP message content, metadata, and content negotiation. HTTP message content, metadata, and content negotiation.
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 E.8. The changes in this draft are summarized in Appendix E.9.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 5 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 5 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 5
1.2. Syntax Notation . . . . . . . . . . . . . . . . . . . . . 5 1.2. Requirements . . . . . . . . . . . . . . . . . . . . . . . 6
1.2.1. Core Rules . . . . . . . . . . . . . . . . . . . . . . 6 1.3. Syntax Notation . . . . . . . . . . . . . . . . . . . . . 6
1.2.2. ABNF Rules defined in other Parts of the 1.3.1. Core Rules . . . . . . . . . . . . . . . . . . . . . . 6
1.3.2. ABNF Rules defined in other Parts of the
Specification . . . . . . . . . . . . . . . . . . . . 6 Specification . . . . . . . . . . . . . . . . . . . . 6
2. Protocol Parameters . . . . . . . . . . . . . . . . . . . . . 6 2. Protocol Parameters . . . . . . . . . . . . . . . . . . . . . 7
2.1. Character Sets . . . . . . . . . . . . . . . . . . . . . . 6 2.1. Character Sets . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1. Missing Charset . . . . . . . . . . . . . . . . . . . 7 2.1.1. Missing Charset . . . . . . . . . . . . . . . . . . . 8
2.2. Content Codings . . . . . . . . . . . . . . . . . . . . . 7 2.2. Content Codings . . . . . . . . . . . . . . . . . . . . . 8
2.2.1. Content Coding Registry . . . . . . . . . . . . . . . 9
2.3. Media Types . . . . . . . . . . . . . . . . . . . . . . . 9 2.3. Media Types . . . . . . . . . . . . . . . . . . . . . . . 9
2.3.1. Canonicalization and Text Defaults . . . . . . . . . . 9 2.3.1. Canonicalization and Text Defaults . . . . . . . . . . 10
2.3.2. Multipart Types . . . . . . . . . . . . . . . . . . . 10 2.3.2. Multipart Types . . . . . . . . . . . . . . . . . . . 11
2.4. Language Tags . . . . . . . . . . . . . . . . . . . . . . 11 2.4. Language Tags . . . . . . . . . . . . . . . . . . . . . . 11
3. Entity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3. Entity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1. Entity Header Fields . . . . . . . . . . . . . . . . . . . 12 3.1. Entity Header Fields . . . . . . . . . . . . . . . . . . . 12
3.2. Entity Body . . . . . . . . . . . . . . . . . . . . . . . 12 3.2. Entity Body . . . . . . . . . . . . . . . . . . . . . . . 13
3.2.1. Type . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.2.1. Type . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2.2. Entity Length . . . . . . . . . . . . . . . . . . . . 13 3.2.2. Entity Length . . . . . . . . . . . . . . . . . . . . 13
4. Content Negotiation . . . . . . . . . . . . . . . . . . . . . 13 4. Content Negotiation . . . . . . . . . . . . . . . . . . . . . 14
4.1. Server-driven Negotiation . . . . . . . . . . . . . . . . 14 4.1. Server-driven Negotiation . . . . . . . . . . . . . . . . 14
4.2. Agent-driven Negotiation . . . . . . . . . . . . . . . . . 15 4.2. Agent-driven Negotiation . . . . . . . . . . . . . . . . . 15
4.3. Transparent Negotiation . . . . . . . . . . . . . . . . . 15 4.3. Transparent Negotiation . . . . . . . . . . . . . . . . . 16
5. Header Field Definitions . . . . . . . . . . . . . . . . . . . 16 5. Header Field Definitions . . . . . . . . . . . . . . . . . . . 16
5.1. Accept . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.1. Accept . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2. Accept-Charset . . . . . . . . . . . . . . . . . . . . . . 18 5.2. Accept-Charset . . . . . . . . . . . . . . . . . . . . . . 19
5.3. Accept-Encoding . . . . . . . . . . . . . . . . . . . . . 19 5.3. Accept-Encoding . . . . . . . . . . . . . . . . . . . . . 20
5.4. Accept-Language . . . . . . . . . . . . . . . . . . . . . 20 5.4. Accept-Language . . . . . . . . . . . . . . . . . . . . . 21
5.5. Content-Encoding . . . . . . . . . . . . . . . . . . . . . 22 5.5. Content-Encoding . . . . . . . . . . . . . . . . . . . . . 23
5.6. Content-Language . . . . . . . . . . . . . . . . . . . . . 23 5.6. Content-Language . . . . . . . . . . . . . . . . . . . . . 23
5.7. Content-Location . . . . . . . . . . . . . . . . . . . . . 24 5.7. Content-Location . . . . . . . . . . . . . . . . . . . . . 24
5.8. Content-MD5 . . . . . . . . . . . . . . . . . . . . . . . 24 5.8. Content-MD5 . . . . . . . . . . . . . . . . . . . . . . . 25
5.9. Content-Type . . . . . . . . . . . . . . . . . . . . . . . 26 5.9. Content-Type . . . . . . . . . . . . . . . . . . . . . . . 26
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 26 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 27
6.1. Message Header Registration . . . . . . . . . . . . . . . 26 6.1. Message Header Registration . . . . . . . . . . . . . . . 27
7. Security Considerations . . . . . . . . . . . . . . . . . . . 27 6.2. Content Coding Registry . . . . . . . . . . . . . . . . . 27
7.1. Privacy Issues Connected to Accept Headers . . . . . . . . 27 7. Security Considerations . . . . . . . . . . . . . . . . . . . 28
7.2. Content-Disposition Issues . . . . . . . . . . . . . . . . 28 7.1. Privacy Issues Connected to Accept Headers . . . . . . . . 28
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 28 7.2. Content-Disposition Issues . . . . . . . . . . . . . . . . 29
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 28 8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 29
9.1. Normative References . . . . . . . . . . . . . . . . . . . 28 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9.2. Informative References . . . . . . . . . . . . . . . . . . 30 9.1. Normative References . . . . . . . . . . . . . . . . . . . 29
9.2. Informative References . . . . . . . . . . . . . . . . . . 31
Appendix A. Differences Between HTTP Entities and RFC 2045 Appendix A. Differences Between HTTP Entities and RFC 2045
Entities . . . . . . . . . . . . . . . . . . . . . . 31 Entities . . . . . . . . . . . . . . . . . . . . . . 32
A.1. MIME-Version . . . . . . . . . . . . . . . . . . . . . . . 31 A.1. MIME-Version . . . . . . . . . . . . . . . . . . . . . . . 32
A.2. Conversion to Canonical Form . . . . . . . . . . . . . . . 32 A.2. Conversion to Canonical Form . . . . . . . . . . . . . . . 33
A.3. Conversion of Date Formats . . . . . . . . . . . . . . . . 32 A.3. Conversion of Date Formats . . . . . . . . . . . . . . . . 33
A.4. Introduction of Content-Encoding . . . . . . . . . . . . . 32 A.4. Introduction of Content-Encoding . . . . . . . . . . . . . 33
A.5. No Content-Transfer-Encoding . . . . . . . . . . . . . . . 33 A.5. No Content-Transfer-Encoding . . . . . . . . . . . . . . . 34
A.6. Introduction of Transfer-Encoding . . . . . . . . . . . . 33 A.6. Introduction of Transfer-Encoding . . . . . . . . . . . . 34
A.7. MHTML and Line Length Limitations . . . . . . . . . . . . 33 A.7. MHTML and Line Length Limitations . . . . . . . . . . . . 34
Appendix B. Additional Features . . . . . . . . . . . . . . . . . 33 Appendix B. Additional Features . . . . . . . . . . . . . . . . . 34
B.1. Content-Disposition . . . . . . . . . . . . . . . . . . . 34 B.1. Content-Disposition . . . . . . . . . . . . . . . . . . . 35
Appendix C. Compatibility with Previous Versions . . . . . . . . 34 Appendix C. Compatibility with Previous Versions . . . . . . . . 35
C.1. Changes from RFC 2068 . . . . . . . . . . . . . . . . . . 34 C.1. Changes from RFC 2068 . . . . . . . . . . . . . . . . . . 35
C.2. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 35 C.2. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 36
Appendix D. Collected ABNF . . . . . . . . . . . . . . . . . . . 35 Appendix D. Collected ABNF . . . . . . . . . . . . . . . . . . . 36
Appendix E. Change Log (to be removed by RFC Editor before Appendix E. Change Log (to be removed by RFC Editor before
publication) . . . . . . . . . . . . . . . . . . . . 37 publication) . . . . . . . . . . . . . . . . . . . . 38
E.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 37 E.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 38
E.2. Since draft-ietf-httpbis-p3-payload-00 . . . . . . . . . . 37 E.2. Since draft-ietf-httpbis-p3-payload-00 . . . . . . . . . . 38
E.3. Since draft-ietf-httpbis-p3-payload-01 . . . . . . . . . . 38 E.3. Since draft-ietf-httpbis-p3-payload-01 . . . . . . . . . . 39
E.4. Since draft-ietf-httpbis-p3-payload-02 . . . . . . . . . . 38 E.4. Since draft-ietf-httpbis-p3-payload-02 . . . . . . . . . . 39
E.5. Since draft-ietf-httpbis-p3-payload-03 . . . . . . . . . . 39 E.5. Since draft-ietf-httpbis-p3-payload-03 . . . . . . . . . . 40
E.6. Since draft-ietf-httpbis-p3-payload-04 . . . . . . . . . . 39 E.6. Since draft-ietf-httpbis-p3-payload-04 . . . . . . . . . . 40
E.7. Since draft-ietf-httpbis-p3-payload-05 . . . . . . . . . . 39 E.7. Since draft-ietf-httpbis-p3-payload-05 . . . . . . . . . . 40
E.8. Since draft-ietf-httpbis-p3-payload-06 . . . . . . . . . . 40 E.8. Since draft-ietf-httpbis-p3-payload-06 . . . . . . . . . . 41
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 E.9. Since draft-ietf-httpbis-p3-payload-07 . . . . . . . . . . 41
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 42 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 44
1. Introduction 1. Introduction
This document defines HTTP/1.1 message payloads (a.k.a., content), This document defines HTTP/1.1 message payloads (a.k.a., content),
the associated metadata header fields that define how the payload is the associated metadata header fields that define how the payload is
intended to be interpreted by a recipient, the request header fields intended to be interpreted by a recipient, the request header fields
that may influence content selection, and the various selection that may influence content selection, and the various selection
algorithms that are collectively referred to as HTTP content algorithms that are collectively referred to as HTTP content
negotiation. negotiation.
This document is currently disorganized in order to minimize the This document is currently disorganized in order to minimize the
changes between drafts and enable reviewers to see the smaller errata changes between drafts and enable reviewers to see the smaller errata
changes. The next draft will reorganize the sections to better changes. The next draft will reorganize the sections to better
reflect the content. In particular, the sections on entities will be reflect the content. In particular, the sections on entities will be
renamed payload and moved to the first half of the document, while renamed payload and moved to the first half of the document, while
the sections on content negotiation and associated request header the sections on content negotiation and associated request header
fields will be moved to the second half. The current mess reflects fields will be moved to the second half. The current mess reflects
how widely dispersed these topics and associated requirements had how widely dispersed these topics and associated requirements had
become in [RFC2616]. become in [RFC2616].
1.1. Requirements 1.1. Terminology
This specification uses a number of terms to refer to the roles
played by participants in, and objects of, the HTTP communication.
content negotiation
The mechanism for selecting the appropriate representation when
servicing a request. The representation of entities in any
response can be negotiated (including error responses).
entity
The information transferred as the payload of a request or
response. An entity consists of metadata in the form of entity-
header fields and content in the form of an entity-body.
representation
An entity included with a response that is subject to content
negotiation. There may exist multiple representations associated
with a particular response status.
variant
A resource may have one, or more than one, representation(s)
associated with it at any given instant. Each of these
representations is termed a `variant'. Use of the term `variant'
does not necessarily imply that the resource is subject to content
negotiation.
1.2. Requirements
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119]. document are to be interpreted as described in [RFC2119].
An implementation is not compliant if it fails to satisfy one or more An implementation is not compliant if it fails to satisfy one or more
of the MUST or REQUIRED level requirements for the protocols it of the MUST or REQUIRED level requirements for the protocols it
implements. An implementation that satisfies all the MUST or implements. An implementation that satisfies all the MUST or
REQUIRED level and all the SHOULD level requirements for its REQUIRED level and all the SHOULD level requirements for its
protocols is said to be "unconditionally compliant"; one that protocols is said to be "unconditionally compliant"; one that
satisfies all the MUST level requirements but not all the SHOULD satisfies all the MUST level requirements but not all the SHOULD
level requirements for its protocols is said to be "conditionally level requirements for its protocols is said to be "conditionally
compliant." compliant."
1.2. Syntax Notation 1.3. Syntax Notation
This specification uses the ABNF syntax defined in Section 1.2 of This specification uses the ABNF syntax defined in Section 1.2 of
[Part1] (which extends the syntax defined in [RFC5234] with a list [Part1] (which extends the syntax defined in [RFC5234] with a list
rule). Appendix D shows the collected ABNF, with the list rule rule). Appendix D shows the collected ABNF, with the list rule
expanded. expanded.
The following core rules are included by reference, as defined in The following core rules are included by reference, as defined in
[RFC5234], Appendix B.1: ALPHA (letters), CR (carriage return), CRLF [RFC5234], Appendix B.1: ALPHA (letters), CR (carriage return), CRLF
(CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote), (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote),
HEXDIG (hexadecimal 0-9/A-F/a-f), LF (line feed), OCTET (any 8-bit HEXDIG (hexadecimal 0-9/A-F/a-f), LF (line feed), OCTET (any 8-bit
sequence of data), SP (space), VCHAR (any visible USASCII character), sequence of data), SP (space), VCHAR (any visible USASCII character),
and WSP (whitespace). and WSP (whitespace).
1.2.1. Core Rules 1.3.1. Core Rules
The core rules below are defined in Section 1.2.2 of [Part1]: The core rules below are defined in Section 1.2.2 of [Part1]:
quoted-string = <quoted-string, defined in [Part1], Section 1.2.2> quoted-string = <quoted-string, defined in [Part1], Section 1.2.2>
token = <token, defined in [Part1], Section 1.2.2> token = <token, defined in [Part1], Section 1.2.2>
OWS = <OWS, defined in [Part1], Section 1.2.2> OWS = <OWS, defined in [Part1], Section 1.2.2>
1.2.2. ABNF Rules defined in other Parts of the Specification 1.3.2. ABNF Rules defined in other Parts of the Specification
The ABNF rules below are defined in other parts: The ABNF rules below are defined in other parts:
absolute-URI = <absolute-URI, defined in [Part1], Section 2.1> absolute-URI = <absolute-URI, defined in [Part1], Section 2.6>
Content-Length = <Content-Length, defined in [Part1], Section 8.2> Content-Length = <Content-Length, defined in [Part1], Section 9.2>
message-header = <message-header, defined in [Part1], Section 4.2> header-field = <header-field, defined in [Part1], Section 3.2>
partial-URI = <partial-URI, defined in [Part1], Section 2.1> partial-URI = <partial-URI, defined in [Part1], Section 2.6>
qvalue = <qvalue, defined in [Part1], Section 3.5> qvalue = <qvalue, defined in [Part1], Section 6.4>
Last-Modified = <Last-Modified, defined in [Part4], Section 6.6> Last-Modified = <Last-Modified, defined in [Part4], Section 6.6>
Content-Range = <Content-Range, defined in [Part5], Section 5.2> Content-Range = <Content-Range, defined in [Part5], Section 5.2>
Expires = <Expires, defined in [Part6], Section 3.3> Expires = <Expires, defined in [Part6], Section 3.3>
2. Protocol Parameters 2. Protocol Parameters
2.1. Character Sets 2.1. Character Sets
skipping to change at page 8, line 16 skipping to change at page 8, line 46
content-coding = token content-coding = token
All content-coding values are case-insensitive. HTTP/1.1 uses All content-coding values are case-insensitive. HTTP/1.1 uses
content-coding values in the Accept-Encoding (Section 5.3) and content-coding values in the Accept-Encoding (Section 5.3) and
Content-Encoding (Section 5.5) header fields. Although the value Content-Encoding (Section 5.5) header fields. Although the value
describes the content-coding, what is more important is that it describes the content-coding, what is more important is that it
indicates what decoding mechanism will be required to remove the indicates what decoding mechanism will be required to remove the
encoding. encoding.
The Internet Assigned Numbers Authority (IANA) acts as a registry for
content-coding value tokens. Initially, the registry contains the
following tokens:
gzip
An encoding format produced by the file compression program "gzip"
(GNU zip) as described in [RFC1952]. This format is a Lempel-Ziv
coding (LZ77) with a 32 bit CRC.
compress compress
The encoding format produced by the common UNIX file compression See Section 6.2.2.1 of [Part1].
program "compress". This format is an adaptive Lempel-Ziv-Welch
coding (LZW).
Use of program names for the identification of encoding formats is
not desirable and is discouraged for future encodings. Their use
here is representative of historical practice, not good design.
For compatibility with previous implementations of HTTP,
applications SHOULD consider "x-gzip" and "x-compress" to be
equivalent to "gzip" and "compress" respectively.
deflate deflate
See Section 6.2.2.2 of [Part1].
The "zlib" format defined in [RFC1950] in combination with the gzip
"deflate" compression mechanism described in [RFC1951].
See Section 6.2.2.3 of [Part1].
identity identity
The default (identity) encoding; the use of no transformation The default (identity) encoding; the use of no transformation
whatsoever. This content-coding is used only in the Accept- whatsoever. This content-coding is used only in the Accept-
Encoding header, and SHOULD NOT be used in the Content-Encoding Encoding header, and SHOULD NOT be used in the Content-Encoding
header. header.
New content-coding value tokens SHOULD be registered; to allow 2.2.1. Content Coding Registry
interoperability between clients and servers, specifications of the
content coding algorithms needed to implement a new value SHOULD be The HTTP Content Coding Registry defines the name space for the
publicly available and adequate for independent implementation, and content coding names.
conform to the purpose of content coding defined in this section.
Registrations MUST include the following fields:
o Name
o Description
o Pointer to specification text
Values to be added to this name space require expert review and a
specification (see "Expert Review" and "Specification Required" in
Section 4.1 of [RFC5226]), and MUST conform to the purpose of content
coding defined in this section.
The registry itself is maintained at
<http://www.iana.org/assignments/http-parameters>.
2.3. Media Types 2.3. Media Types
HTTP uses Internet Media Types [RFC2046] in the Content-Type HTTP uses Internet Media Types [RFC2046] in the Content-Type
(Section 5.9) and Accept (Section 5.1) header fields in order to (Section 5.9) and Accept (Section 5.1) header fields in order to
provide open and extensible data typing and type negotiation. provide open and extensible data typing and type negotiation.
media-type = type "/" subtype *( OWS ";" OWS parameter ) media-type = type "/" subtype *( OWS ";" OWS parameter )
type = token type = token
subtype = token subtype = token
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behavior as a MIME user agent would upon receipt of a multipart type. behavior as a MIME user agent would upon receipt of a multipart type.
If an application receives an unrecognized multipart subtype, the If an application receives an unrecognized multipart subtype, the
application MUST treat it as being equivalent to "multipart/mixed". application MUST treat it as being equivalent to "multipart/mixed".
Note: The "multipart/form-data" type has been specifically defined Note: The "multipart/form-data" type has been specifically defined
for carrying form data suitable for processing via the POST for carrying form data suitable for processing via the POST
request method, as described in [RFC2388]. request method, as described in [RFC2388].
2.4. Language Tags 2.4. Language Tags
A language tag identifies a natural language spoken, written, or A language tag, as defined in [RFC5646], identifies a natural
otherwise conveyed by human beings for communication of information language spoken, written, or otherwise conveyed by human beings for
to other human beings. Computer languages are explicitly excluded. communication of information to other human beings. Computer
HTTP uses language tags within the Accept-Language and Content- languages are explicitly excluded. HTTP uses language tags within
Language fields. the Accept-Language and Content-Language fields.
The syntax and registry of HTTP language tags is the same as that In summary, a language tag is composed of one or more parts: A
defined by [RFC1766]. In summary, a language tag is composed of 1 or primary language subtag followed by a possibly empty series of
more parts: A primary language tag and a possibly empty series of
subtags: subtags:
language-tag = primary-tag *( "-" subtag ) language-tag = <Language-Tag, defined in [RFC5646], Section 2.1>
primary-tag = 1*8ALPHA
subtag = 1*8ALPHA
White space is not allowed within the tag and all tags are case- White space is not allowed within the tag and all tags are case-
insensitive. The name space of language tags is administered by the insensitive. The name space of language subtags is administered by
IANA. Example tags include: the IANA (see
<http://www.iana.org/assignments/language-subtag-registry>).
en, en-US, en-cockney, i-cherokee, x-pig-latin Example tags include:
where any two-letter primary-tag is an ISO-639 language abbreviation en, en-US, es-419, az-Arab, x-pig-latin, man-Nkoo-GN
and any two-letter initial subtag is an ISO-3166 country code. (The
last three tags above are not registered tags; all but the last are See [RFC5646] for further information.
examples of tags which could be registered in future.)
3. Entity 3. Entity
Request and Response messages MAY transfer an entity if not otherwise Request and Response messages MAY transfer an entity if not otherwise
restricted by the request method or response status code. An entity restricted by the request method or response status code. An entity
consists of entity-header fields and an entity-body, although some consists of entity-header fields and an entity-body, although some
responses will only include the entity-headers. responses will only include the entity-headers.
In this section, both sender and recipient refer to either the client In this section, both sender and recipient refer to either the client
or the server, depending on who sends and who receives the entity. or the server, depending on who sends and who receives the entity.
3.1. Entity Header Fields 3.1. Entity Header Fields
Entity-header fields define metainformation about the entity-body or, Entity-header fields define metainformation about the entity-body or,
if no body is present, about the resource identified by the request. if no body is present, about the resource identified by the request.
entity-header = Content-Encoding ; Section 5.5 entity-header = Content-Encoding ; Section 5.5
/ Content-Language ; Section 5.6 / Content-Language ; Section 5.6
/ Content-Length ; [Part1], Section 8.2 / Content-Length ; [Part1], Section 9.2
/ Content-Location ; Section 5.7 / Content-Location ; Section 5.7
/ Content-MD5 ; Section 5.8 / Content-MD5 ; Section 5.8
/ Content-Range ; [Part5], Section 5.2 / Content-Range ; [Part5], Section 5.2
/ Content-Type ; Section 5.9 / Content-Type ; Section 5.9
/ Expires ; [Part6], Section 3.3 / Expires ; [Part6], Section 3.3
/ Last-Modified ; [Part4], Section 6.6 / Last-Modified ; [Part4], Section 6.6
/ extension-header / extension-header
extension-header = message-header extension-header = header-field
The extension-header mechanism allows additional entity-header fields The extension-header mechanism allows additional entity-header fields
to be defined without changing the protocol, but these fields cannot to be defined without changing the protocol, but these fields cannot
be assumed to be recognizable by the recipient. Unrecognized header be assumed to be recognizable by the recipient. Unrecognized header
fields SHOULD be ignored by the recipient and MUST be forwarded by fields SHOULD be ignored by the recipient and MUST be forwarded by
transparent proxies. transparent proxies.
3.2. Entity Body 3.2. Entity Body
The entity-body (if any) sent with an HTTP request or response is in The entity-body (if any) sent with an HTTP request or response is in
a format and encoding defined by the entity-header fields. a format and encoding defined by the entity-header fields.
entity-body = *OCTET entity-body = *OCTET
An entity-body is only present in a message when a message-body is An entity-body is only present in a message when a message-body is
present, as described in Section 4.3 of [Part1]. The entity-body is present, as described in Section 3.3 of [Part1]. The entity-body is
obtained from the message-body by decoding any Transfer-Encoding that obtained from the message-body by decoding any Transfer-Encoding that
might have been applied to ensure safe and proper transfer of the might have been applied to ensure safe and proper transfer of the
message. message.
3.2.1. Type 3.2.1. Type
When an entity-body is included with a message, the data type of that When an entity-body is included with a message, the data type of that
body is determined via the header fields Content-Type and Content- body is determined via the header fields Content-Type and Content-
Encoding. These define a two-layer, ordered encoding model: Encoding. These define a two-layer, ordered encoding model:
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present, it indicates that the sender does not know the media type of present, it indicates that the sender does not know the media type of
the data; recipients MAY either assume that it is "application/ the data; recipients MAY either assume that it is "application/
octet-stream" ([RFC2046], Section 4.5.1) or examine the content to octet-stream" ([RFC2046], Section 4.5.1) or examine the content to
determine its type. determine its type.
Content-Encoding may be used to indicate any additional content Content-Encoding may be used to indicate any additional content
codings applied to the data, usually for the purpose of data codings applied to the data, usually for the purpose of data
compression, that are a property of the requested resource. There is compression, that are a property of the requested resource. There is
no default encoding. no default encoding.
Note that neither the interpretation of the data type of a message
nor the behaviors caused by it are defined by HTTP; this potentially
includes examination of the content to override any indicated type
("sniffing").
3.2.2. Entity Length 3.2.2. Entity Length
The entity-length of a message is the length of the message-body The entity-length of a message is the length of the message-body
before any transfer-codings have been applied. Section 4.4 of before any transfer-codings have been applied. Section 3.4 of
[Part1] defines how the transfer-length of a message-body is [Part1] defines how the transfer-length of a message-body is
determined. determined.
4. Content Negotiation 4. Content Negotiation
Most HTTP responses include an entity which contains information for Most HTTP responses include an entity which contains information for
interpretation by a human user. Naturally, it is desirable to supply interpretation by a human user. Naturally, it is desirable to supply
the user with the "best available" entity corresponding to the the user with the "best available" entity corresponding to the
request. Unfortunately for servers and caches, not all users have request. Unfortunately for servers and caches, not all users have
the same preferences for what is "best," and not all user agents are the same preferences for what is "best," and not all user agents are
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This section defines the syntax and semantics of HTTP/1.1 header This section defines the syntax and semantics of HTTP/1.1 header
fields related to the payload of messages. fields related to the payload of messages.
For entity-header fields, both sender and recipient refer to either For entity-header fields, both sender and recipient refer to either
the client or the server, depending on who sends and who receives the the client or the server, depending on who sends and who receives the
entity. entity.
5.1. Accept 5.1. Accept
The request-header field "Accept" can be used to specify certain The "Accept" request-header field can be used by user agents to
media types which are acceptable for the response. Accept headers specify response media types that are acceptable. Accept headers can
can be used to indicate that the request is specifically limited to a be used to indicate that the request is specifically limited to a
small set of desired types, as in the case of a request for an in- small set of desired types, as in the case of a request for an in-
line image. line image.
Accept = "Accept" ":" OWS Accept-v Accept = "Accept" ":" OWS Accept-v
Accept-v = #( media-range [ accept-params ] ) Accept-v = #( media-range [ accept-params ] )
media-range = ( "*/*" media-range = ( "*/*"
/ ( type "/" "*" ) / ( type "/" "*" )
/ ( type "/" subtype ) / ( type "/" subtype )
) *( OWS ";" OWS parameter ) ) *( OWS ";" OWS parameter )
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The asterisk "*" character is used to group media types into ranges, The asterisk "*" character is used to group media types into ranges,
with "*/*" indicating all media types and "type/*" indicating all with "*/*" indicating all media types and "type/*" indicating all
subtypes of that type. The media-range MAY include media type subtypes of that type. The media-range MAY include media type
parameters that are applicable to that range. parameters that are applicable to that range.
Each media-range MAY be followed by one or more accept-params, Each media-range MAY be followed by one or more accept-params,
beginning with the "q" parameter for indicating a relative quality beginning with the "q" parameter for indicating a relative quality
factor. The first "q" parameter (if any) separates the media-range factor. The first "q" parameter (if any) separates the media-range
parameter(s) from the accept-params. Quality factors allow the user parameter(s) from the accept-params. Quality factors allow the user
or user agent to indicate the relative degree of preference for that or user agent to indicate the relative degree of preference for that
media-range, using the qvalue scale from 0 to 1 (Section 3.5 of media-range, using the qvalue scale from 0 to 1 (Section 6.4 of
[Part1]). The default value is q=1. [Part1]). The default value is q=1.
Note: Use of the "q" parameter name to separate media type Note: Use of the "q" parameter name to separate media type
parameters from Accept extension parameters is due to historical parameters from Accept extension parameters is due to historical
practice. Although this prevents any media type parameter named practice. Although this prevents any media type parameter named
"q" from being used with a media range, such an event is believed "q" from being used with a media range, such an event is believed
to be unlikely given the lack of any "q" parameters in the IANA to be unlikely given the lack of any "q" parameters in the IANA
media type registry and the rare usage of any media type media type registry and the rare usage of any media type
parameters in Accept. Future media types are discouraged from parameters in Accept. Future media types are discouraged from
registering any parameter named "q". registering any parameter named "q".
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| text/html;level=3 | 0.7 | | text/html;level=3 | 0.7 |
+-------------------+---------------+ +-------------------+---------------+
Note: A user agent might be provided with a default set of quality Note: A user agent might be provided with a default set of quality
values for certain media ranges. However, unless the user agent is a values for certain media ranges. However, unless the user agent is a
closed system which cannot interact with other rendering agents, this closed system which cannot interact with other rendering agents, this
default set ought to be configurable by the user. default set ought to be configurable by the user.
5.2. Accept-Charset 5.2. Accept-Charset
The request-header field "Accept-Charset" can be used to indicate The "Accept-Charset" request-header field can be used by user agents
what character sets are acceptable for the response. This field to indicate what response character sets are acceptable. This field
allows clients capable of understanding more comprehensive or allows clients capable of understanding more comprehensive or
special-purpose character sets to signal that capability to a server special-purpose character sets to signal that capability to a server
which is capable of representing documents in those character sets. which is capable of representing documents in those character sets.
Accept-Charset = "Accept-Charset" ":" OWS Accept-Charset = "Accept-Charset" ":" OWS
Accept-Charset-v Accept-Charset-v
Accept-Charset-v = 1#( ( charset / "*" ) Accept-Charset-v = 1#( ( charset / "*" )
[ OWS ";" OWS "q=" qvalue ] ) [ OWS ";" OWS "q=" qvalue ] )
Character set values are described in Section 2.1. Each charset MAY Character set values are described in Section 2.1. Each charset MAY
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If no Accept-Charset header is present, the default is that any If no Accept-Charset header is present, the default is that any
character set is acceptable. If an Accept-Charset header is present, character set is acceptable. If an Accept-Charset header is present,
and if the server cannot send a response which is acceptable and if the server cannot send a response which is acceptable
according to the Accept-Charset header, then the server SHOULD send according to the Accept-Charset header, then the server SHOULD send
an error response with the 406 (Not Acceptable) status code, though an error response with the 406 (Not Acceptable) status code, though
the sending of an unacceptable response is also allowed. the sending of an unacceptable response is also allowed.
5.3. Accept-Encoding 5.3. Accept-Encoding
The request-header field "Accept-Encoding" is similar to Accept, but The "Accept-Encoding" request-header field can be used by user agents
restricts the content-codings (Section 2.2) that are acceptable in to indicate what response content-codings (Section 2.2) are
the response. acceptable in the response.
Accept-Encoding = "Accept-Encoding" ":" OWS Accept-Encoding = "Accept-Encoding" ":" OWS
Accept-Encoding-v Accept-Encoding-v
Accept-Encoding-v = Accept-Encoding-v =
#( codings [ OWS ";" OWS "q=" qvalue ] ) #( codings [ OWS ";" OWS "q=" qvalue ] )
codings = ( content-coding / "*" ) codings = ( content-coding / "*" )
Each codings value MAY be given an associated quality value which Each codings value MAY be given an associated quality value which
represents the preference for that encoding. The default value is represents the preference for that encoding. The default value is
q=1. q=1.
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Accept-Encoding: Accept-Encoding:
Accept-Encoding: * Accept-Encoding: *
Accept-Encoding: compress;q=0.5, gzip;q=1.0 Accept-Encoding: compress;q=0.5, gzip;q=1.0
Accept-Encoding: gzip;q=1.0, identity; q=0.5, *;q=0 Accept-Encoding: gzip;q=1.0, identity; q=0.5, *;q=0
A server tests whether a content-coding is acceptable, according to A server tests whether a content-coding is acceptable, according to
an Accept-Encoding field, using these rules: an Accept-Encoding field, using these rules:
1. If the content-coding is one of the content-codings listed in the 1. If the content-coding is one of the content-codings listed in the
Accept-Encoding field, then it is acceptable, unless it is Accept-Encoding field, then it is acceptable, unless it is
accompanied by a qvalue of 0. (As defined in Section 3.5 of accompanied by a qvalue of 0. (As defined in Section 6.4 of
[Part1], a qvalue of 0 means "not acceptable.") [Part1], a qvalue of 0 means "not acceptable.")
2. The special "*" symbol in an Accept-Encoding field matches any 2. The special "*" symbol in an Accept-Encoding field matches any
available content-coding not explicitly listed in the header available content-coding not explicitly listed in the header
field. field.
3. If multiple content-codings are acceptable, then the acceptable 3. If multiple content-codings are acceptable, then the acceptable
content-coding with the highest non-zero qvalue is preferred. content-coding with the highest non-zero qvalue is preferred.
4. The "identity" content-coding is always acceptable, unless 4. The "identity" content-coding is always acceptable, unless
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messages sent with other content-codings. The server might also messages sent with other content-codings. The server might also
make this decision based on information about the particular user- make this decision based on information about the particular user-
agent or client. agent or client.
Note: Most HTTP/1.0 applications do not recognize or obey qvalues Note: Most HTTP/1.0 applications do not recognize or obey qvalues
associated with content-codings. This means that qvalues will not associated with content-codings. This means that qvalues will not
work and are not permitted with x-gzip or x-compress. work and are not permitted with x-gzip or x-compress.
5.4. Accept-Language 5.4. Accept-Language
The request-header field "Accept-Language" is similar to Accept, but The "Accept-Language" request-header field can be used by user agents
restricts the set of natural languages that are preferred as a to indicate the set of natural languages that are preferred in the
response to the request. Language tags are defined in Section 2.4. response. Language tags are defined in Section 2.4.
Accept-Language = "Accept-Language" ":" OWS Accept-Language = "Accept-Language" ":" OWS
Accept-Language-v Accept-Language-v
Accept-Language-v = Accept-Language-v =
1#( language-range [ OWS ";" OWS "q=" qvalue ] ) 1#( language-range [ OWS ";" OWS "q=" qvalue ] )
language-range = language-range =
<language-range, defined in [RFC4647], Section 2.1> <language-range, defined in [RFC4647], Section 2.1>
Each language-range can be given an associated quality value which Each language-range can be given an associated quality value which
represents an estimate of the user's preference for the languages represents an estimate of the user's preference for the languages
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the user, we remind implementors of the fact that users are not the user, we remind implementors of the fact that users are not
familiar with the details of language matching as described above, familiar with the details of language matching as described above,
and should provide appropriate guidance. As an example, users and should provide appropriate guidance. As an example, users
might assume that on selecting "en-gb", they will be served any might assume that on selecting "en-gb", they will be served any
kind of English document if British English is not available. A kind of English document if British English is not available. A
user agent might suggest in such a case to add "en" to get the user agent might suggest in such a case to add "en" to get the
best matching behavior. best matching behavior.
5.5. Content-Encoding 5.5. Content-Encoding
The entity-header field "Content-Encoding" is used as a modifier to The "Content-Encoding" entity-header field indicates what content-
the media-type. When present, its value indicates what additional codings have been applied to the entity-body, and thus what decoding
content codings have been applied to the entity-body, and thus what mechanisms must be applied in order to obtain the media-type
decoding mechanisms must be applied in order to obtain the media-type
referenced by the Content-Type header field. Content-Encoding is referenced by the Content-Type header field. Content-Encoding is
primarily used to allow a document to be compressed without losing primarily used to allow a document to be compressed without losing
the identity of its underlying media type. the identity of its underlying media type.
Content-Encoding = "Content-Encoding" ":" OWS Content-Encoding-v Content-Encoding = "Content-Encoding" ":" OWS Content-Encoding-v
Content-Encoding-v = 1#content-coding Content-Encoding-v = 1#content-coding
Content codings are defined in Section 2.2. An example of its use is Content codings are defined in Section 2.2. An example of its use is
Content-Encoding: gzip Content-Encoding: gzip
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acceptable to the origin server, the server SHOULD respond with a acceptable to the origin server, the server SHOULD respond with a
status code of 415 (Unsupported Media Type). status code of 415 (Unsupported Media Type).
If multiple encodings have been applied to an entity, the content If multiple encodings have been applied to an entity, the content
codings MUST be listed in the order in which they were applied. codings MUST be listed in the order in which they were applied.
Additional information about the encoding parameters MAY be provided Additional information about the encoding parameters MAY be provided
by other entity-header fields not defined by this specification. by other entity-header fields not defined by this specification.
5.6. Content-Language 5.6. Content-Language
The entity-header field "Content-Language" describes the natural The "Content-Language" entity-header field describes the natural
language(s) of the intended audience for the enclosed entity. Note language(s) of the intended audience for the entity. Note that this
that this might not be equivalent to all the languages used within might not be equivalent to all the languages used within the entity-
the entity-body. body.
Content-Language = "Content-Language" ":" OWS Content-Language-v Content-Language = "Content-Language" ":" OWS Content-Language-v
Content-Language-v = 1#language-tag Content-Language-v = 1#language-tag
Language tags are defined in Section 2.4. The primary purpose of Language tags are defined in Section 2.4. The primary purpose of
Content-Language is to allow a user to identify and differentiate Content-Language is to allow a user to identify and differentiate
entities according to the user's own preferred language. Thus, if entities according to the user's own preferred language. Thus, if
the body content is intended only for a Danish-literate audience, the the body content is intended only for a Danish-literate audience, the
appropriate field is appropriate field is
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An example would be a beginner's language primer, such as "A First An example would be a beginner's language primer, such as "A First
Lesson in Latin," which is clearly intended to be used by an English- Lesson in Latin," which is clearly intended to be used by an English-
literate audience. In this case, the Content-Language would properly literate audience. In this case, the Content-Language would properly
only include "en". only include "en".
Content-Language MAY be applied to any media type -- it is not Content-Language MAY be applied to any media type -- it is not
limited to textual documents. limited to textual documents.
5.7. Content-Location 5.7. Content-Location
The entity-header field "Content-Location" MAY be used to supply the The "Content-Location" entity-header field is used to supply a URI
resource location for the entity enclosed in the message when that for the entity in the message when it is accessible from a location
entity is accessible from a location separate from the requested separate from the requested resource's URI.
resource's URI. A server SHOULD provide a Content-Location for the
variant corresponding to the response entity; especially in the case A server SHOULD provide a Content-Location for the variant
where a resource has multiple entities associated with it, and those corresponding to the response entity, especially in the case where a
entities actually have separate locations by which they might be resource has multiple entities associated with it, and those entities
individually accessed, the server SHOULD provide a Content-Location actually have separate locations by which they might be individually
for the particular variant which is returned. accessed, the server SHOULD provide a Content-Location for the
particular variant which is returned.
Content-Location = "Content-Location" ":" OWS Content-Location = "Content-Location" ":" OWS
Content-Location-v Content-Location-v
Content-Location-v = Content-Location-v =
absolute-URI / partial-URI absolute-URI / partial-URI
The value of Content-Location also defines the base URI for the
entity.
The Content-Location value is not a replacement for the original The Content-Location value is not a replacement for the original
requested URI; it is only a statement of the location of the resource requested URI; it is only a statement of the location of the resource
corresponding to this particular entity at the time of the request. corresponding to this particular entity at the time of the request.
Future requests MAY specify the Content-Location URI as the request- Future requests MAY specify the Content-Location URI as the request-
target if the desire is to identify the source of that particular target if the desire is to identify the source of that particular
entity. entity.
Section 6.1 of [Part2] describes how clients may process the Content-
Location header field.
A cache cannot assume that an entity with a Content-Location A cache cannot assume that an entity with a Content-Location
different from the URI used to retrieve it can be used to respond to different from the URI used to retrieve it can be used to respond to
later requests on that Content-Location URI. However, the Content- later requests on that Content-Location URI. However, the Content-
Location can be used to differentiate between multiple entities Location can be used to differentiate between multiple entities
retrieved from a single requested resource, as described in Section retrieved from a single requested resource, as described in Section
2.6 of [Part6]. 2.6 of [Part6].
If the Content-Location is a relative URI, the relative URI is If the Content-Location is a relative URI, the relative URI is
interpreted relative to the request-target. interpreted relative to the request-target.
The meaning of the Content-Location header in requests is undefined; The meaning of the Content-Location header in requests is undefined;
servers are free to ignore it in those cases. servers are free to ignore it in those cases.
5.8. Content-MD5 5.8. Content-MD5
The entity-header field "Content-MD5", as defined in [RFC1864], is an The "Content-MD5" entity-header field, as defined in [RFC1864], is an
MD5 digest of the entity-body for the purpose of providing an end-to- MD5 digest of the entity-body that provides an end-to-end message
end message integrity check (MIC) of the entity-body. (Note: a MIC integrity check (MIC) of the entity-body. Note that a MIC is good
is good for detecting accidental modification of the entity-body in for detecting accidental modification of the entity-body in transit,
transit, but is not proof against malicious attacks.) but is not proof against malicious attacks.
Content-MD5 = "Content-MD5" ":" OWS Content-MD5-v Content-MD5 = "Content-MD5" ":" OWS Content-MD5-v
Content-MD5-v = <base64 of 128 bit MD5 digest as per [RFC1864]> Content-MD5-v = <base64 of 128 bit MD5 digest as per [RFC1864]>
The Content-MD5 header field MAY be generated by an origin server or The Content-MD5 header field MAY be generated by an origin server or
client to function as an integrity check of the entity-body. Only client to function as an integrity check of the entity-body. Only
origin servers or clients MAY generate the Content-MD5 header field; origin servers or clients MAY generate the Content-MD5 header field;
proxies and gateways MUST NOT generate it, as this would defeat its proxies and gateways MUST NOT generate it, as this would defeat its
value as an end-to-end integrity check. Any recipient of the entity- value as an end-to-end integrity check. Any recipient of the entity-
body, including gateways and proxies, MAY check that the digest value body, including gateways and proxies, MAY check that the digest value
in this header field matches that of the entity-body as received. in this header field matches that of the entity-body as received.
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HTTP, unlike MIME, does not use Content-Transfer-Encoding, and HTTP, unlike MIME, does not use Content-Transfer-Encoding, and
does use Transfer-Encoding and Content-Encoding. Another is that does use Transfer-Encoding and Content-Encoding. Another is that
HTTP more frequently uses binary content types than MIME, so it is HTTP more frequently uses binary content types than MIME, so it is
worth noting that, in such cases, the byte order used to compute worth noting that, in such cases, the byte order used to compute
the digest is the transmission byte order defined for the type. the digest is the transmission byte order defined for the type.
Lastly, HTTP allows transmission of text types with any of several Lastly, HTTP allows transmission of text types with any of several
line break conventions and not just the canonical form using CRLF. line break conventions and not just the canonical form using CRLF.
5.9. Content-Type 5.9. Content-Type
The entity-header field "Content-Type" indicates the media type of The "Content-Type" entity-header field indicates the media type of
the entity-body sent to the recipient or, in the case of the HEAD the entity-body. In the case of responses to the HEAD method, the
method, the media type that would have been sent had the request been media type is that which would have been sent had the request been a
a GET. GET.
Content-Type = "Content-Type" ":" OWS Content-Type-v Content-Type = "Content-Type" ":" OWS Content-Type-v
Content-Type-v = media-type Content-Type-v = media-type
Media types are defined in Section 2.3. An example of the field is Media types are defined in Section 2.3. An example of the field is
Content-Type: text/html; charset=ISO-8859-4 Content-Type: text/html; charset=ISO-8859-4
Further discussion of methods for identifying the media type of an Further discussion of methods for identifying the media type of an
entity is provided in Section 3.2.1. entity is provided in Section 3.2.1.
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| Content-Language | http | standard | Section 5.6 | | Content-Language | http | standard | Section 5.6 |
| Content-Location | http | standard | Section 5.7 | | Content-Location | http | standard | Section 5.7 |
| Content-MD5 | http | standard | Section 5.8 | | Content-MD5 | http | standard | Section 5.8 |
| Content-Type | http | standard | Section 5.9 | | Content-Type | http | standard | Section 5.9 |
| MIME-Version | http | | Appendix A.1 | | MIME-Version | http | | Appendix A.1 |
+---------------------+----------+----------+--------------+ +---------------------+----------+----------+--------------+
The change controller is: "IETF (iesg@ietf.org) - Internet The change controller is: "IETF (iesg@ietf.org) - Internet
Engineering Task Force". Engineering Task Force".
6.2. Content Coding Registry
The registration procedure for HTTP Content Codings is now defined by
Section 2.2.1 of this document.
The HTTP Content Codings Registry located at
<http://www.iana.org/assignments/http-parameters> should be updated
with the registration below:
+----------+-----------------------------------+--------------------+
| Name | Description | Reference |
+----------+-----------------------------------+--------------------+
| compress | UNIX "compress" program method | Section 6.2.2.1 of |
| | | [Part1] |
| deflate | "zlib" format [RFC1950] with | Section 6.2.2.2 of |
| | "deflate" compression | [Part1] |
| gzip | Same as GNU zip [RFC1952] | Section 6.2.2.3 of |
| | | [Part1] |
| identity | No transformation | Section 2.2 |
+----------+-----------------------------------+--------------------+
7. Security Considerations 7. Security Considerations
This section is meant to inform application developers, information This section is meant to inform application developers, information
providers, and users of the security limitations in HTTP/1.1 as providers, and users of the security limitations in HTTP/1.1 as
described by this document. The discussion does not include described by this document. The discussion does not include
definitive solutions to the problems revealed, though it does make definitive solutions to the problems revealed, though it does make
some suggestions for reducing security risks. some suggestions for reducing security risks.
7.1. Privacy Issues Connected to Accept Headers 7.1. Privacy Issues Connected to Accept Headers
skipping to change at page 28, line 29 skipping to change at page 29, line 36
[ISO-8859-1] [ISO-8859-1]
International Organization for Standardization, International Organization for Standardization,
"Information technology -- 8-bit single-byte coded graphic "Information technology -- 8-bit single-byte coded graphic
character sets -- Part 1: Latin alphabet No. 1", ISO/ character sets -- Part 1: Latin alphabet No. 1", ISO/
IEC 8859-1:1998, 1998. IEC 8859-1:1998, 1998.
[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-07 and Message Parsing", draft-ietf-httpbis-p1-messaging-08
(work in progress), July 2009. (work in progress), October 2009.
[Part2] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H., [Part2] 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 2: Message and J. Reschke, Ed., "HTTP/1.1, part 2: Message
Semantics", draft-ietf-httpbis-p2-semantics-07 (work in Semantics", draft-ietf-httpbis-p2-semantics-08 (work in
progress), July 2009. progress), October 2009.
[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-07 (work in Requests", draft-ietf-httpbis-p4-conditional-08 (work in
progress), July 2009. progress), October 2009.
[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-07 (work Partial Responses", draft-ietf-httpbis-p5-range-08 (work
in progress), July 2009. in progress), October 2009.
[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-07 (work in 6: Caching", draft-ietf-httpbis-p6-cache-08 (work in
progress), July 2009. progress), October 2009.
[RFC1766] Alvestrand, H., "Tags for the Identification of
Languages", RFC 1766, March 1995.
[RFC1864] Myers, J. and M. Rose, "The Content-MD5 Header Field", [RFC1864] Myers, J. and M. Rose, "The Content-MD5 Header Field",
RFC 1864, October 1995. RFC 1864, October 1995.
[RFC1950] Deutsch, L. and J-L. Gailly, "ZLIB Compressed Data Format [RFC1950] Deutsch, L. and J-L. Gailly, "ZLIB Compressed Data Format
Specification version 3.3", RFC 1950, May 1996. Specification version 3.3", RFC 1950, May 1996.
RFC 1950 is an Informational RFC, thus it may be less RFC 1950 is an Informational RFC, thus it may be less
stable than this specification. On the other hand, this stable than this specification. On the other hand, this
downward reference was present since the publication of downward reference was present since the publication of
RFC 2068 in 1997 ([RFC2068]), therefore it is unlikely to RFC 2068 in 1997 ([RFC2068]), therefore it is unlikely to
cause problems in practice. See also [BCP97]. cause problems in practice. See also [BCP97].
[RFC1951] Deutsch, P., "DEFLATE Compressed Data Format Specification
version 1.3", RFC 1951, May 1996.
RFC 1951 is an Informational RFC, thus it may be less
stable than this specification. On the other hand, this
downward reference was present since the publication of
RFC 2068 in 1997 ([RFC2068]), therefore it is unlikely to
cause problems in practice. See also [BCP97].
[RFC1952] Deutsch, P., Gailly, J-L., Adler, M., Deutsch, L., and G. [RFC1952] Deutsch, P., Gailly, J-L., Adler, M., Deutsch, L., and G.
Randers-Pehrson, "GZIP file format specification version Randers-Pehrson, "GZIP file format specification version
4.3", RFC 1952, May 1996. 4.3", RFC 1952, May 1996.
RFC 1952 is an Informational RFC, thus it may be less RFC 1952 is an Informational RFC, thus it may be less
stable than this specification. On the other hand, this stable than this specification. On the other hand, this
downward reference was present since the publication of downward reference was present since the publication of
RFC 2068 in 1997 ([RFC2068]), therefore it is unlikely to RFC 2068 in 1997 ([RFC2068]), therefore it is unlikely to
cause problems in practice. See also [BCP97]. cause problems in practice. See also [BCP97].
skipping to change at page 30, line 12 skipping to change at page 31, line 8
[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.
[RFC4647] Phillips, A., Ed. and M. Davis, Ed., "Matching of Language [RFC4647] Phillips, A., Ed. and M. Davis, Ed., "Matching of Language
Tags", BCP 47, RFC 4647, September 2006. Tags", BCP 47, RFC 4647, September 2006.
[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.
[RFC5646] Phillips, A., Ed. and M. Davis, Ed., "Tags for Identifying
Languages", BCP 47, RFC 5646, September 2009.
9.2. Informative References 9.2. Informative References
[BCP97] Klensin, J. and S. Hartman, "Handling Normative References [BCP97] Klensin, J. and S. Hartman, "Handling Normative References
to Standards-Track Documents", BCP 97, RFC 4897, to Standards-Track Documents", BCP 97, RFC 4897,
June 2007. June 2007.
[RFC1945] Berners-Lee, T., Fielding, R., and H. Nielsen, "Hypertext [RFC1945] Berners-Lee, T., Fielding, R., and H. Nielsen, "Hypertext
Transfer Protocol -- HTTP/1.0", RFC 1945, May 1996. Transfer Protocol -- HTTP/1.0", RFC 1945, May 1996.
[RFC2049] Freed, N. and N. Borenstein, "Multipurpose Internet Mail [RFC2049] Freed, N. and N. Borenstein, "Multipurpose Internet Mail
skipping to change at page 31, line 12 skipping to change at page 32, line 10
[RFC3629] Yergeau, F., "UTF-8, a transformation format of ISO [RFC3629] Yergeau, F., "UTF-8, a transformation format of ISO
10646", RFC 3629, STD 63, November 2003. 10646", RFC 3629, STD 63, November 2003.
[RFC3864] Klyne, G., Nottingham, M., and J. Mogul, "Registration [RFC3864] Klyne, G., Nottingham, M., and J. Mogul, "Registration
Procedures for Message Header Fields", BCP 90, RFC 3864, Procedures for Message Header Fields", BCP 90, RFC 3864,
September 2004. September 2004.
[RFC4288] Freed, N. and J. Klensin, "Media Type Specifications and [RFC4288] Freed, N. and J. Klensin, "Media Type Specifications and
Registration Procedures", BCP 13, RFC 4288, December 2005. Registration Procedures", BCP 13, RFC 4288, December 2005.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008.
[RFC5322] Resnick, P., "Internet Message Format", RFC 5322, [RFC5322] Resnick, P., "Internet Message Format", RFC 5322,
October 2008. October 2008.
Appendix A. Differences Between HTTP Entities and RFC 2045 Entities Appendix A. Differences Between HTTP Entities and RFC 2045 Entities
HTTP/1.1 uses many of the constructs defined for Internet Mail HTTP/1.1 uses many of the constructs defined for Internet Mail
([RFC5322]) and the Multipurpose Internet Mail Extensions (MIME ([RFC5322]) and the Multipurpose Internet Mail Extensions (MIME
[RFC2045]) to allow entities to be transmitted in an open variety of [RFC2045]) to allow entities to be transmitted in an open variety of
representations and with extensible mechanisms. However, RFC 2045 representations and with extensible mechanisms. However, RFC 2045
discusses mail, and HTTP has a few features that are different from discusses mail, and HTTP has a few features that are different from
skipping to change at page 32, line 33 skipping to change at page 33, line 35
octets 13 and 10 to represent CR and LF, as is the case for some octets 13 and 10 to represent CR and LF, as is the case for some
multi-byte character sets. multi-byte character sets.
Implementors should note that conversion will break any cryptographic Implementors should note that conversion will break any cryptographic
checksums applied to the original content unless the original content checksums applied to the original content unless the original content
is already in canonical form. Therefore, the canonical form is is already in canonical form. Therefore, the canonical form is
recommended for any content that uses such checksums in HTTP. recommended for any content that uses such checksums in HTTP.
A.3. Conversion of Date Formats A.3. Conversion of Date Formats
HTTP/1.1 uses a restricted set of date formats (Section 3.2 of HTTP/1.1 uses a restricted set of date formats (Section 6.1 of
[Part1]) to simplify the process of date comparison. Proxies and [Part1]) to simplify the process of date comparison. Proxies and
gateways from other protocols SHOULD ensure that any Date header gateways from other protocols SHOULD ensure that any Date header
field present in a message conforms to one of the HTTP/1.1 formats field present in a message conforms to one of the HTTP/1.1 formats
and rewrite the date if necessary. and rewrite the date if necessary.
A.4. Introduction of Content-Encoding A.4. Introduction of Content-Encoding
RFC 2045 does not include any concept equivalent to HTTP/1.1's RFC 2045 does not include any concept equivalent to HTTP/1.1's
Content-Encoding header field. Since this acts as a modifier on the Content-Encoding header field. Since this acts as a modifier on the
media type, proxies and gateways from HTTP to MIME-compliant media type, proxies and gateways from HTTP to MIME-compliant
skipping to change at page 33, line 22 skipping to change at page 34, line 22
Proxies and gateways from HTTP to MIME-compliant protocols are Proxies and gateways from HTTP to MIME-compliant protocols are
responsible for ensuring that the message is in the correct format responsible for ensuring that the message is in the correct format
and encoding for safe transport on that protocol, where "safe and encoding for safe transport on that protocol, where "safe
transport" is defined by the limitations of the protocol being used. transport" is defined by the limitations of the protocol being used.
Such a proxy or gateway SHOULD label the data with an appropriate Such a proxy or gateway SHOULD label the data with an appropriate
Content-Transfer-Encoding if doing so will improve the likelihood of Content-Transfer-Encoding if doing so will improve the likelihood of
safe transport over the destination protocol. safe transport over the destination protocol.
A.6. Introduction of Transfer-Encoding A.6. Introduction of Transfer-Encoding
HTTP/1.1 introduces the Transfer-Encoding header field (Section 8.7 HTTP/1.1 introduces the Transfer-Encoding header field (Section 9.7
of [Part1]). Proxies/gateways MUST remove any transfer-coding prior of [Part1]). Proxies/gateways MUST remove any transfer-coding prior
to forwarding a message via a MIME-compliant protocol. to forwarding a message via a MIME-compliant protocol.
A.7. MHTML and Line Length Limitations A.7. MHTML and Line Length Limitations
HTTP implementations which share code with MHTML [RFC2557] HTTP implementations which share code with MHTML [RFC2557]
implementations need to be aware of MIME line length limitations. implementations need to be aware of MIME line length limitations.
Since HTTP does not have this limitation, HTTP does not fold long Since HTTP does not have this limitation, HTTP does not fold long
lines. MHTML messages being transported by HTTP follow all lines. MHTML messages being transported by HTTP follow all
conventions of MHTML, including line length limitations and folding, conventions of MHTML, including line length limitations and folding,
skipping to change at page 34, line 7 skipping to change at page 35, line 7
interoperability with, other HTTP/1.1 applications. Some of these interoperability with, other HTTP/1.1 applications. Some of these
describe proposed experimental features, and some describe features describe proposed experimental features, and some describe features
that experimental deployment found lacking that are now addressed in that experimental deployment found lacking that are now addressed in
the base HTTP/1.1 specification. the base HTTP/1.1 specification.
A number of other headers, such as Content-Disposition and Title, A number of other headers, such as Content-Disposition and Title,
from SMTP and MIME are also often implemented (see [RFC2076]). from SMTP and MIME are also often implemented (see [RFC2076]).
B.1. Content-Disposition B.1. Content-Disposition
The Content-Disposition response-header field has been proposed as a The "Content-Disposition" response-header field has been proposed as
means for the origin server to suggest a default filename if the user a means for the origin server to suggest a default filename if the
requests that the content is saved to a file. This usage is derived user requests that the content is saved to a file. This usage is
from the definition of Content-Disposition in [RFC2183]. derived from the definition of Content-Disposition in [RFC2183].
content-disposition = "Content-Disposition" ":" OWS content-disposition = "Content-Disposition" ":" OWS
content-disposition-v content-disposition-v
content-disposition-v = disposition-type content-disposition-v = disposition-type
*( OWS ";" OWS disposition-parm ) *( OWS ";" OWS disposition-parm )
disposition-type = "attachment" / disp-extension-token disposition-type = "attachment" / disp-extension-token
disposition-parm = filename-parm / disp-extension-parm disposition-parm = filename-parm / disp-extension-parm
filename-parm = "filename" "=" quoted-string filename-parm = "filename" "=" quoted-string
disp-extension-token = token disp-extension-token = token
disp-extension-parm = token "=" ( token / quoted-string ) disp-extension-parm = token "=" ( token / quoted-string )
skipping to change at page 35, line 20 skipping to change at page 36, line 20
The Alternates, Content-Version, Derived-From, Link, URI, Public and The Alternates, Content-Version, Derived-From, Link, URI, Public and
Content-Base header fields were defined in previous versions of this Content-Base header fields were defined in previous versions of this
specification, but not commonly implemented. See Section 19.6.2 of specification, but not commonly implemented. See Section 19.6.2 of
[RFC2068]. [RFC2068].
C.2. Changes from RFC 2616 C.2. Changes from RFC 2616
Clarify contexts that charset is used in. (Section 2.1) Clarify contexts that charset is used in. (Section 2.1)
Remove base URI setting semantics for Content-Location due to poor
implementation support, which was caused by too many broken servers
emitting bogus Content-Location headers, and also the potentially
undesirable effect of potentially breaking relative links in content-
negotiated resources. (Section 5.7)
Remove reference to non-existant identity transfer-coding value Remove reference to non-existant identity transfer-coding value
tokens. (Appendix A.5) tokens. (Appendix A.5)
Appendix D. Collected ABNF Appendix D. Collected ABNF
Accept = "Accept:" OWS Accept-v Accept = "Accept:" OWS Accept-v
Accept-Charset = "Accept-Charset:" OWS Accept-Charset-v Accept-Charset = "Accept-Charset:" OWS Accept-Charset-v
Accept-Charset-v = *( "," OWS ) ( charset / "*" ) [ OWS ";" OWS "q=" Accept-Charset-v = *( "," OWS ) ( charset / "*" ) [ OWS ";" OWS "q="
qvalue ] *( OWS "," [ OWS ( charset / "*" ) [ OWS ";" OWS "q=" qvalue ] *( OWS "," [ OWS ( charset / "*" ) [ OWS ";" OWS "q="
qvalue ] ] ) qvalue ] ] )
skipping to change at page 35, line 46 skipping to change at page 37, line 6
] ) ] )
Accept-v = [ ( "," / ( media-range [ accept-params ] ) ) *( OWS "," [ Accept-v = [ ( "," / ( media-range [ accept-params ] ) ) *( OWS "," [
OWS media-range [ accept-params ] ] ) ] OWS media-range [ accept-params ] ] ) ]
Content-Encoding = "Content-Encoding:" OWS Content-Encoding-v Content-Encoding = "Content-Encoding:" OWS Content-Encoding-v
Content-Encoding-v = *( "," OWS ) content-coding *( OWS "," [ OWS Content-Encoding-v = *( "," OWS ) content-coding *( OWS "," [ OWS
content-coding ] ) content-coding ] )
Content-Language = "Content-Language:" OWS Content-Language-v Content-Language = "Content-Language:" OWS Content-Language-v
Content-Language-v = *( "," OWS ) language-tag *( OWS "," [ OWS Content-Language-v = *( "," OWS ) language-tag *( OWS "," [ OWS
language-tag ] ) language-tag ] )
Content-Length = <Content-Length, defined in [Part1], Section 8.2> Content-Length = <Content-Length, defined in [Part1], Section 9.2>
Content-Location = "Content-Location:" OWS Content-Location-v Content-Location = "Content-Location:" OWS Content-Location-v
Content-Location-v = absolute-URI / partial-URI Content-Location-v = absolute-URI / partial-URI
Content-MD5 = "Content-MD5:" OWS Content-MD5-v Content-MD5 = "Content-MD5:" OWS Content-MD5-v
Content-MD5-v = <base64 of 128 bit MD5 digest as per [RFC1864]> Content-MD5-v = <base64 of 128 bit MD5 digest as per [RFC1864]>
Content-Range = <Content-Range, defined in [Part5], Section 5.2> Content-Range = <Content-Range, defined in [Part5], Section 5.2>
Content-Type = "Content-Type:" OWS Content-Type-v Content-Type = "Content-Type:" OWS Content-Type-v
Content-Type-v = media-type Content-Type-v = media-type
Expires = <Expires, defined in [Part6], Section 3.3> Expires = <Expires, defined in [Part6], Section 3.3>
Last-Modified = <Last-Modified, defined in [Part4], Section 6.6> Last-Modified = <Last-Modified, defined in [Part4], Section 6.6>
MIME-Version = "MIME-Version:" OWS MIME-Version-v MIME-Version = "MIME-Version:" OWS MIME-Version-v
MIME-Version-v = 1*DIGIT "." 1*DIGIT MIME-Version-v = 1*DIGIT "." 1*DIGIT
OWS = <OWS, defined in [Part1], Section 1.2.2> OWS = <OWS, defined in [Part1], Section 1.2.2>
absolute-URI = <absolute-URI, defined in [Part1], Section 2.1> absolute-URI = <absolute-URI, defined in [Part1], Section 2.6>
accept-ext = OWS ";" OWS token [ "=" ( token / quoted-string ) ] accept-ext = OWS ";" OWS token [ "=" ( token / quoted-string ) ]
accept-params = OWS ";" OWS "q=" qvalue *accept-ext accept-params = OWS ";" OWS "q=" qvalue *accept-ext
attribute = token attribute = token
charset = token charset = token
codings = ( content-coding / "*" ) codings = ( content-coding / "*" )
content-coding = token content-coding = token
content-disposition = "Content-Disposition:" OWS content-disposition = "Content-Disposition:" OWS
content-disposition-v content-disposition-v
content-disposition-v = disposition-type *( OWS ";" OWS content-disposition-v = disposition-type *( OWS ";" OWS
skipping to change at page 36, line 39 skipping to change at page 37, line 46
disp-extension-parm = token "=" ( token / quoted-string ) disp-extension-parm = token "=" ( token / quoted-string )
disp-extension-token = token disp-extension-token = token
disposition-parm = filename-parm / disp-extension-parm disposition-parm = filename-parm / disp-extension-parm
disposition-type = "attachment" / disp-extension-token disposition-type = "attachment" / disp-extension-token
entity-body = *OCTET entity-body = *OCTET
entity-header = Content-Encoding / Content-Language / Content-Length entity-header = Content-Encoding / Content-Language / Content-Length
/ Content-Location / Content-MD5 / Content-Range / Content-Type / / Content-Location / Content-MD5 / Content-Range / Content-Type /
Expires / Last-Modified / extension-header Expires / Last-Modified / extension-header
extension-header = message-header extension-header = header-field
filename-parm = "filename=" quoted-string filename-parm = "filename=" quoted-string
header-field = <header-field, defined in [Part1], Section 3.2>
language-range = <language-range, defined in [RFC4647], Section 2.1> language-range = <language-range, defined in [RFC4647], Section 2.1>
language-tag = primary-tag *( "-" subtag ) language-tag = <Language-Tag, defined in [RFC5646], Section 2.1>
media-range = ( "*/*" / ( type "/*" ) / ( type "/" subtype ) ) *( OWS media-range = ( "*/*" / ( type "/*" ) / ( type "/" subtype ) ) *( OWS
";" OWS parameter ) ";" OWS parameter )
media-type = type "/" subtype *( OWS ";" OWS parameter ) media-type = type "/" subtype *( OWS ";" OWS parameter )
message-header = <message-header, defined in [Part1], Section 4.2>
parameter = attribute "=" value parameter = attribute "=" value
partial-URI = <partial-URI, defined in [Part1], Section 2.1> partial-URI = <partial-URI, defined in [Part1], Section 2.6>
primary-tag = 1*8ALPHA
quoted-string = <quoted-string, defined in [Part1], Section 1.2.2> quoted-string = <quoted-string, defined in [Part1], Section 1.2.2>
qvalue = <qvalue, defined in [Part1], Section 3.5> qvalue = <qvalue, defined in [Part1], Section 6.4>
subtag = 1*8ALPHA
subtype = token subtype = token
token = <token, defined in [Part1], Section 1.2.2> token = <token, defined in [Part1], Section 1.2.2>
type = token type = token
value = token / quoted-string value = token / quoted-string
ABNF diagnostics: ABNF diagnostics:
; Accept defined but not used ; Accept defined but not used
skipping to change at page 40, line 23 skipping to change at page 41, line 28
E.8. Since draft-ietf-httpbis-p3-payload-06 E.8. Since draft-ietf-httpbis-p3-payload-06
Closed issues: Closed issues:
o <http://tools.ietf.org/wg/httpbis/trac/ticket/80>: "Content- o <http://tools.ietf.org/wg/httpbis/trac/ticket/80>: "Content-
Location isn't special" Location isn't special"
o <http://tools.ietf.org/wg/httpbis/trac/ticket/155>: "Content o <http://tools.ietf.org/wg/httpbis/trac/ticket/155>: "Content
Sniffing" Sniffing"
E.9. Since draft-ietf-httpbis-p3-payload-07
Closed issues:
o <http://tools.ietf.org/wg/httpbis/trac/ticket/13>: "Updated
reference for language tags"
o <http://tools.ietf.org/wg/httpbis/trac/ticket/110>: "Clarify rules
for determining what entities a response carries"
o <http://tools.ietf.org/wg/httpbis/trac/ticket/154>: "Content-
Location base-setting problems"
o <http://tools.ietf.org/wg/httpbis/trac/ticket/155>: "Content
Sniffing"
o <http://tools.ietf.org/wg/httpbis/trac/ticket/188>: "pick IANA
policy (RFC5226) for Transfer Coding / Content Coding"
o <http://tools.ietf.org/wg/httpbis/trac/ticket/189>: "move
definitions of gzip/deflate/compress to part 1"
Partly resolved issues:
o <http://tools.ietf.org/wg/httpbis/trac/ticket/148>: "update IANA
requirements wrt Transfer-Coding values" (add the IANA
Considerations subsection)
o <http://tools.ietf.org/wg/httpbis/trac/ticket/149>: "update IANA
requirements wrt Content-Coding values" (add the IANA
Considerations subsection)
Index Index
A A
Accept header 16 Accept header 17
Accept-Charset header 18 Accept-Charset header 19
Accept-Encoding header 19 Accept-Encoding header 20
Accept-Language header 20 Accept-Language header 21
Alternates header 35 Alternates header 36
C C
compress 8 Coding Format
Content Type Sniffing 13 compress 8
Content-Base header 35 deflate 8
Content-Disposition header 34 gzip 9
Content-Encoding header 22 identity 9
compress (Coding Format) 8
content negotiation 5
Content-Base header 36
Content-Disposition header 35
Content-Encoding header 23
Content-Language header 23 Content-Language header 23
Content-Location header 24 Content-Location header 24
Content-MD5 header 24 Content-MD5 header 25
Content-Type header 26 Content-Type header 26
Content-Version header 35 Content-Version header 36
D D
deflate 8 deflate (Coding Format) 8
Derived-From header 35 Derived-From header 36
E
entity 5
G G
Grammar Grammar
Accept 16 Accept 17
Accept-Charset 18 Accept-Charset 19
Accept-Charset-v 18 Accept-Charset-v 19
Accept-Encoding 19 Accept-Encoding 20
Accept-Encoding-v 19 Accept-Encoding-v 20
accept-ext 16 accept-ext 17
Accept-Language 21 Accept-Language 21
Accept-Language-v 21 Accept-Language-v 21
accept-params 16 accept-params 17
Accept-v 16 Accept-v 17
attribute 9 attribute 10
charset 7 charset 7
codings 19 codings 20
content-coding 8 content-coding 8
content-disposition 34 content-disposition 35
content-disposition-v 34 content-disposition-v 35
Content-Encoding 22 Content-Encoding 23
Content-Encoding-v 22 Content-Encoding-v 23
Content-Language 23 Content-Language 23
Content-Language-v 23 Content-Language-v 23
Content-Location 24 Content-Location 24
Content-Location-v 24 Content-Location-v 24
Content-MD5 25 Content-MD5 25
Content-MD5-v 25 Content-MD5-v 25
Content-Type 26 Content-Type 26
Content-Type-v 26 Content-Type-v 26
disp-extension-parm 34 disp-extension-parm 35
disp-extension-token 34 disp-extension-token 35
disposition-parm 34 disposition-parm 35
disposition-type 34 disposition-type 35
entity-body 12 entity-body 13
entity-header 12 entity-header 12
extension-header 12 extension-header 12
filename-parm 34 filename-parm 35
language-range 21 language-range 21
language-tag 11 language-tag 12
media-range 16 media-range 17
media-type 9 media-type 9
MIME-Version 31 MIME-Version 32
MIME-Version-v 31 MIME-Version-v 32
parameter 9 parameter 10
primary-tag 11
subtag 11
subtype 9 subtype 9
type 9 type 9
value 9 value 10
gzip 8 gzip (Coding Format) 9
H H
Headers Headers
Accept 16 Accept 17
Accept-Charset 18 Accept-Charset 19
Accept-Encoding 19 Accept-Encoding 20
Accept-Language 20 Accept-Language 21
Alternate 35 Alternate 36
Content-Base 35 Content-Base 36
Content-Disposition 34 Content-Disposition 35
Content-Encoding 22 Content-Encoding 23
Content-Language 23 Content-Language 23
Content-Location 24 Content-Location 24
Content-MD5 24 Content-MD5 25
Content-Type 26 Content-Type 26
Content-Version 35 Content-Version 36
Derived-From 35 Derived-From 36
Link 35 Link 36
MIME-Version 31 MIME-Version 32
Public 35 Public 36
URI 35 URI 36
I I
identity 8 identity (Coding Format) 9
L L
Link header 35 Link header 36
M M
MIME-Version header 31 MIME-Version header 32
P P
Public header 35 Public header 36
R
representation 5
U U
URI header 35 URI header 36
V
variant 5
Authors' Addresses Authors' Addresses
Roy T. Fielding (editor) Roy T. Fielding (editor)
Day Software Day Software
23 Corporate Plaza DR, Suite 280 23 Corporate Plaza DR, Suite 280
Newport Beach, CA 92660 Newport Beach, CA 92660
USA USA
Phone: +1-949-706-5300 Phone: +1-949-706-5300
 End of changes. 96 change blocks. 
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