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

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10.1.2 101 Switching ProtocolsThe server understands and is willing to comply with the client'srequest, via the Upgrade message header field (section 14.42), for achange in the application protocol being used on this connection. Theserver will switch protocols to those defined by the response'sUpgrade header field immediately after the empty line whichterminates the 101 response.The protocol SHOULD be switched only when it is advantageous to doso. For example, switching to a newer version of HTTP is advantageousover older versions, and switching to a real-time, synchronousprotocol might be advantageous when delivering resources that usesuch features.10.2 Successful 2xxThis class of status code indicates that the client's request wassuccessfully received, understood, and accepted.10.2.1 200 OKThe request has succeeded. The information returned with the responseis dependent on the method used in the request, for example:GETan entity corresponding to the requested resource is sent inthe response;HEAD the entity-header fields corresponding to the requestedresource are sent in the response without any message-body;POST an entity describing or containing the result of the action;Fielding, et al. Standards Track [Page 58]RFC 2616 HTTP/1.1 June 1999TRACE an entity containing the request message as received by theend server.10.2.2 201 CreatedThe request has been fulfilled and resulted in a new resource beingcreated. The newly created resource can be referenced by the URI(s)returned in the entity of the response, with the most specific URIfor the resource given by a Location header field. The response
SHOULD include an entity containing a list of resourcecharacteristics and location(s) from which the user or user agent canchoose the one most appropriate. The entity format is specified bythe media type given in the Content-Type header field. The originserver MUST create the resource before returning the 201 status code.If the action cannot be carried out immediately, the server SHOULDrespond with 202 (Accepted) response instead.A 201 response MAY contain an ETag response header field indicatingthe current value of the entity tag for the requested variant justcreated, see section 14.19.10.2.3 202 AcceptedThe request has been accepted for processing, but the processing hasnot been completed. The request might or might not eventually beacted upon, as it might be disallowed when processing actually takesplace. There is no facility for re-sending a status code from anasynchronous operation such as this.The 202 response is intentionally non-committal. Its purpose is toallow a server to accept a request for some other process (perhaps abatch-oriented process that is only run once per day) withoutrequiring that the user agent's connection to the server persistuntil the process is completed. The entity returned with thisresponse SHOULD include an indication of the request's current statusand either a pointer to a status monitor or some estimate of when theuser can expect the request to be fulfilled.10.2.4 203 Non-Authoritative InformationThe returned metainformation in the entity-header is not thedefinitive set as available from the origin server, but is gatheredfrom a local or a third-party copy. The set presented MAY be a subsetor superset of the original version. For example, including localannotation information about the resource might result in a supersetof the metainformation known by the origin server. Use of thisresponse code is not required and is only appropriate when theresponse would otherwise be 200 (OK).Fielding, et al. Standards Track [Page 59]RFC 2616 HTTP/1.1 June 199910.2.5 204 No ContentThe server has fulfilled the request but does not need to return anentity-body, and might want to return updated metainformation. The
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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
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 24 and 25: Fielding, et al. Standards Track [P
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 38 and 39: in advance.Messages MUST NOT includ
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 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
Page 88 and 89: in the past. This means that the re
Page 90 and 91: RFC 2616 HTTP/1.1 June 1999the time
Page 92 and 93: simple:response_is_fresh = (freshne
Page 94 and 95: match.In HTTP/1.1, a conditional re
Page 96 and 97: validators or strong validators. Cl
Page 98 and 99: - MAY send a weak entity tag instea
Page 100 and 101: Unless specifically constrained by
Page 104 and 105: warn-code 1xx, which are deleted ev
Page 106 and 107: for the associated entity, its enti
Page 108 and 109: - DELETE- POSTIn order to prevent d
Page 110 and 111: The Accept request-header field can
Page 112 and 113: 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,
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