Network Working Group R. Fielding Request for Comments: 2616 ...

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also needed to be a general header, as PUT or other methods may haveneed for it in requests.Fielding, et al. Standards Track [Page 174]RFC 2616 HTTP/1.1 June 1999Transfer-coding had significant problems, particularly withinteractions with chunked encoding. The solution is that transfercodingsbecome as full fledged as content-codings. This involvesadding an IANA registry for transfer-codings (separate from contentcodings), a new header field (TE) and enabling trailer headers in thefuture. Transfer encoding is a major performance benefit, so it wasworth fixing [39]. TE also solves another, obscure, downwardinteroperability problem that could have occurred due to interactionsbetween authentication trailers, chunked encoding and HTTP/1.0clients.(Section 3.6, 3.6.1, and 14.39)The PATCH, LINK, UNLINK methods were defined but not commonlyimplemented in previous versions of this specification. See RFC 2068[33].The Alternates, Content-Version, Derived-From, Link, URI, Public andContent-Base header fields were defined in previous versions of thisspecification, but not commonly implemented. See RFC 2068 [33].20 IndexPlease see the PostScript version of this RFC for the INDEX.
Fielding, et al. Standards Track [Page 175]RFC 2616 HTTP/1.1 June 199921. Full Copyright StatementCopyright (C) The Internet Society (1999). All Rights Reserved.This document and translations of it may be copied and furnished toothers, and derivative works that comment on or otherwise explain itor assist in its implementation may be prepared, copied, publishedand distributed, in whole or in part, without restriction of anykind, provided that the above copyright notice and this paragraph areincluded on all such copies and derivative works. However, thisdocument itself may not be modified in any way, such as by removingthe copyright notice or references to the Internet Society or otherInternet organizations, except as needed for the purpose ofdeveloping Internet standards in which case the procedures forcopyrights defined in the Internet Standards process must befollowed, or as required to translate it into languages other thanEnglish.The limited permissions granted above are perpetual and will not berevoked by the Internet Society or its successors or assigns.This document and the information contained herein is provided on an"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERINGTASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDINGBUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATIONHEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OFMERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.AcknowledgementFunding for the RFC Editor function is currently provided by theInternet Society.
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eferred to as "HTTP/1.1", and is an
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12.1 Server-driven Negotiation ....
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14.40 Trailer .....................
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1.2 RequirementsThe key words "MUST
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Fielding, et al. Standards Track [P
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equest chain ----------------------
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Elements separated by a bar ("|") a
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HTTP/1.1 header field values can be
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An application that sends a request
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3.2.3 URI ComparisonWhen comparing
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is not desirable and is discouraged
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CRLFchunk = chunk-size [ chunk-exte
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When in canonical form, media subty
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3.9 Quality ValuesHTTP content nego
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RFC 2616 HTTP/1.1 June 1999HTTP/1.1
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message-body = entity-body| Transfe
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in advance.Messages MUST NOT includ
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equested resource, and 501 (Not Imp
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names) MUST use the following rules
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values for the first digit:- 1xx: I
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how the transfer-length of a messag
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connection-token close.If either th
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idempotent (see section 9.1.2). Non
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compatibility with RFC 2068, a serv
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If at any point an error status is
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optional features implemented by th
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- Extending a database through an a
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intervention (or other means) on th
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10.1.2 101 Switching ProtocolsThe s
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esponse MAY include new or updated
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The response MUST include the follo
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If the client is sending data, a se
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If the response could be unacceptab
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10.4.15 414 Request-URI Too LongThe
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10.5.5 504 Gateway TimeoutThe serve
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Caching would be useless if it did
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Warning (but without removing any e
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If the user has overridden the basi
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in the past. This means that the re
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RFC 2616 HTTP/1.1 June 1999the time
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simple:response_is_fresh = (freshne
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match.In HTTP/1.1, a conditional re
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validators or strong validators. Cl
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- MAY send a weak entity tag instea
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Unless specifically constrained by
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warn-code 1xx, which are deleted ev
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for the associated entity, its enti
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- DELETE- POSTIn order to prevent d
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The Accept request-header field can
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image/jpeg = 0.5text/html;level=2 =
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Note: If the request does not inclu
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Accept-Ranges: bytesbut are not req
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containing an Authorization field,
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- Restrictions on what may be store
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improve privacy in some cases, we c
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must-revalidateBecause a cache MAY
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understand.For example, consider a
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new coding is known to be acceptabl
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14.14 Content-LocationThe Content-L
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Note: while the definition of Conte
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server SHOULD return them in the or
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Some origin server implementations
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Expires = "Expires" ":" HTTP-dateAn
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Page 182 and 183: Notes:1) Additional CRLFs may prece
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