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

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in advance.Messages MUST NOT include both a Content-Length header field and anon-identity transfer-coding. If the message does include a nonidentitytransfer-coding, the Content-Length MUST be ignored.When a Content-Length is given in a message where a message-body isallowed, its field value MUST exactly match the number of OCTETs inthe message-body. HTTP/1.1 user agents MUST notify the user when aninvalid length is received and detected.4.5 General Header FieldsThere are a few header fields which have general applicability forboth request and response messages, but which do not apply to theentity being transferred. These header fields apply only to theFielding, et al. Standards Track [Page 34]RFC 2616 HTTP/1.1 June 1999message being transmitted.general-header = Cache-Control ; Section 14.9| Connection ; Section 14.10| Date ; Section 14.18| Pragma ; Section 14.32| Trailer ; Section 14.40| Transfer-Encoding ; Section 14.41| Upgrade ; Section 14.42| Via ; Section 14.45| Warning ; Section 14.46General-header field names can be extended reliably only incombination with a change in the protocol version. However, new orexperimental header fields may be given the semantics of generalheader fields if all parties in the communication recognize them tobe general-header fields. Unrecognized header fields are treated asentity-header fields.5 RequestA request message from a client to a server includes, within thefirst line of that message, the method to be applied to the resource,the identifier of the resource, and the protocol version in use.Request = Request-Line ; Section 5.1*(( general-header ; Section 4.5
| request-header ; Section 5.3| entity-header ) CRLF) ; Section 7.1CRLF[ message-body ] ; Section 4.35.1 Request-LineThe Request-Line begins with a method token, followed by theRequest-URI and the protocol version, and ending with CRLF. Theelements are separated by SP characters. No CR or LF is allowedexcept in the final CRLF sequence.Request-Line = Method SP Request-URI SP HTTP-Version CRLFFielding, et al. Standards Track [Page 35]RFC 2616 HTTP/1.1 June 19995.1.1 MethodThe Method token indicates the method to be performed on theresource identified by the Request-URI. The method is case-sensitive.Method = "OPTIONS" ; Section 9.2| "GET" ; Section 9.3| "HEAD" ; Section 9.4| "POST" ; Section 9.5| "PUT" ; Section 9.6| "DELETE" ; Section 9.7| "TRACE" ; Section 9.8| "CONNECT" ; Section 9.9| extension-methodextension-method = tokenThe list of methods allowed by a resource can be specified in anAllow header field (section 14.7). The return code of the responsealways notifies the client whether a method is currently allowed on aresource, since the set of allowed methods can change dynamically. Anorigin server SHOULD return the status code 405 (Method Not Allowed)if the method is known by the origin server but not allowed for the
Page 2: eferred to as "HTTP/1.1", and is an
Page 5 and 6: 12.1 Server-driven Negotiation ....
Page 7 and 8: 14.40 Trailer .....................
Page 9 and 10: 1.2 RequirementsThe key words "MUST
Page 12 and 13: Fielding, et al. Standards Track [P
Page 14 and 15: equest chain ----------------------
Page 16 and 17: Elements separated by a bar ("|") a
Page 18 and 19: HTTP/1.1 header field values can be
Page 20 and 21: An application that sends a request
Page 22 and 23: 3.2.3 URI ComparisonWhen comparing
Page 26 and 27: is not desirable and is discouraged
Page 28 and 29: CRLFchunk = chunk-size [ chunk-exte
Page 30 and 31: When in canonical form, media subty
Page 32 and 33: 3.9 Quality ValuesHTTP content nego
Page 34 and 35: RFC 2616 HTTP/1.1 June 1999HTTP/1.1
Page 36 and 37: message-body = entity-body| Transfe
Page 40 and 41: equested resource, and 501 (Not Imp
Page 42 and 43: names) MUST use the following rules
Page 44 and 45: values for the first digit:- 1xx: I
Page 48 and 49: how the transfer-length of a messag
Page 50 and 51: connection-token close.If either th
Page 52 and 53: idempotent (see section 9.1.2). Non
Page 54 and 55: compatibility with RFC 2068, a serv
Page 56 and 57: If at any point an error status is
Page 58 and 59: optional features implemented by th
Page 60 and 61: - Extending a database through an a
Page 62 and 63: intervention (or other means) on th
Page 64 and 65: 10.1.2 101 Switching ProtocolsThe s
Page 66 and 67: esponse MAY include new or updated
Page 70 and 71: The response MUST include the follo
Page 72 and 73: If the client is sending data, a se
Page 74 and 75: If the response could be unacceptab
Page 76 and 77: 10.4.15 414 Request-URI Too LongThe
Page 78 and 79: 10.5.5 504 Gateway TimeoutThe serve
Page 82 and 83: Caching would be useless if it did
Page 84 and 85: Warning (but without removing any e
Page 86 and 87: 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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Fielding, et al. Standards Track [P
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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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A client MUST include a Host header
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een modified since the date given b
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RFC 2616 HTTP/1.1 June 1999If none
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14.29 Last-ModifiedThe Last-Modifie
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MAY require that behavior be consis
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yte-ranges-specifier = bytes-unit "
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Content) instead of 200 (OK).- The
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The TE request-header field indicat
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a cache cannot determine from the r
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SHOULD NOT, by default, forward the
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this user agent behavior in mind.Re
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designers and implementors be parti
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strongly correlated to the membersh
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serious security considerations. Co
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The HTTP protocol has evolved consi
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Protocol -- HTTP/1.0", RFC 1945, Ma
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Implementation and Analysis", RFC 1
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University of California, IrvineIrv
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Notes:1) Additional CRLFs may prece
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full compliance with the MIME proto
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ead chunk-size and CRLF}read entity
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- understand any valid response in
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CREATE had a race that required an
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also needed to be a general header,
Page 194:
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Network Working Group R. Fielding Request for Comments: 2616 ...

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