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

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10.4.15 414 Request-URI Too LongThe server is refusing to service the request because the Request-URIis longer than the server is willing to interpret. This rarecondition is only likely to occur when a client has improperlyconverted a POST request to a GET request with long queryinformation, when the client has descended into a URI "black hole" ofredirection (e.g., a redirected URI prefix that points to a suffix ofitself), or when the server is under attack by a client attempting toexploit security holes present in some servers using fixed-lengthbuffers for reading or manipulating the Request-URI.10.4.16 415 Unsupported Media TypeThe server is refusing to service the request because the entity ofthe request is in a format not supported by the requested resourcefor the requested method.10.4.17 416 Requested Range Not SatisfiableA server SHOULD return a response with this status code if a requestincluded a Range request-header field (section 14.35), and none ofthe range-specifier values in this field overlap the current extentof the selected resource, and the request did not include an If-Rangerequest-header field. (For byte-ranges, this means that the firstbyte-posof all of the byte-range-spec values were greater than thecurrent length of the selected resource.)When this status code is returned for a byte-range request, theresponse SHOULD include a Content-Range entity-header fieldspecifying the current length of the selected resource (see section14.16). This response MUST NOT use the multipart/byteranges contenttype.Fielding, et al. Standards Track [Page 69]RFC 2616 HTTP/1.1 June 199910.4.18 417 Expectation FailedThe expectation given in an Expect request-header field (see section14.20) could not be met by this server, or, if the server is a proxy,the server has unambiguous evidence that the request could not be met
y the next-hop server.10.5 Server Error 5xxResponse status codes beginning with the digit "5" indicate cases inwhich the server is aware that it has erred or is incapable ofperforming the request. Except when responding to a HEAD request, theserver SHOULD include an entity containing an explanation of theerror situation, and whether it is a temporary or permanentcondition. User agents SHOULD display any included entity to theuser. These response codes are applicable to any request method.10.5.1 500 Internal Server ErrorThe server encountered an unexpected condition which prevented itfrom fulfilling the request.10.5.2 501 Not ImplementedThe server does not support the functionality required to fulfill therequest. This is the appropriate response when the server does notrecognize the request method and is not capable of supporting it forany resource.10.5.3 502 Bad GatewayThe server, while acting as a gateway or proxy, received an invalidresponse from the upstream server it accessed in attempting tofulfill the request.10.5.4 503 Service UnavailableThe server is currently unable to handle the request due to atemporary overloading or maintenance of the server. The implicationis that this is a temporary condition which will be alleviated aftersome delay. If known, the length of the delay MAY be indicated in aRetry-After header. If no Retry-After is given, the client SHOULDhandle the response as it would for a 500 response.Note: The existence of the 503 status code does not imply that aserver must use it when becoming overloaded. Some servers may wishto simply refuse the connection.Fielding, et al. Standards Track [Page 70]RFC 2616 HTTP/1.1 June 1999
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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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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 46 and 47: Fielding, et al. Standards Track [P
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 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 =
Page 114 and 115: Note: If the request does not inclu
Page 116 and 117: Accept-Ranges: bytesbut are not req
Page 118 and 119: containing an Authorization field,
Page 120 and 121: - Restrictions on what may be store
Page 122 and 123: 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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