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

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10.2.2 201 Created ..............................................5910.2.3 202 Accepted .............................................5910.2.4 203 Non-Authoritative Information ........................5910.2.5 204 No Content ...........................................6010.2.6 205 Reset Content ........................................6010.2.7 206 Partial Content ......................................6010.3 Redirection 3xx .............................................6110.3.1 300 Multiple Choices .....................................6110.3.2 301 Moved Permanently ....................................6210.3.3 302 Found ................................................6210.3.4 303 See Other ............................................6310.3.5 304 Not Modified .........................................6310.3.6 305 Use Proxy ............................................6410.3.7 306 (Unused) .............................................64Fielding, et al. Standards Track [Page 3]RFC 2616 HTTP/1.1 June 199910.3.8 307 Temporary Redirect ...................................6510.4 Client Error 4xx ............................................6510.4.1 400 Bad Request .........................................6510.4.2 401 Unauthorized ........................................6610.4.3 402 Payment Required ....................................6610.4.4 403 Forbidden ...........................................6610.4.5 404 Not Found ...........................................6610.4.6 405 Method Not Allowed ..................................6610.4.7 406 Not Acceptable ......................................6710.4.8 407 Proxy Authentication Required .......................6710.4.9 408 Request Timeout .....................................6710.4.10 409 Conflict ............................................6710.4.11 410 Gone ................................................6810.4.12 411 Length Required .....................................6810.4.13 412 Precondition Failed .................................6810.4.14 413 Request Entity Too Large ............................6910.4.15 414 Request-URI Too Long ................................6910.4.16 415 Unsupported Media Type ..............................6910.4.17 416 Requested Range Not Satisfiable .....................6910.4.18 417 Expectation Failed ..................................7010.5 Server Error 5xx ............................................7010.5.1 500 Internal Server Error ................................7010.5.2 501 Not Implemented ......................................7010.5.3 502 Bad Gateway ..........................................7010.5.4 503 Service Unavailable ..................................7010.5.5 504 Gateway Timeout ......................................7110.5.6 505 HTTP Version Not Supported ...........................7111 Access Authentication ........................................7112 Content Negotiation ..........................................71
12.1 Server-driven Negotiation ...................................7212.2 Agent-driven Negotiation ....................................7312.3 Transparent Negotiation .....................................7413 Caching in HTTP ..............................................7413.1.1 Cache Correctness ........................................7513.1.2 Warnings .................................................7613.1.3 Cache-control Mechanisms .................................7713.1.4 Explicit User Agent Warnings .............................7813.1.5 Exceptions to the Rules and Warnings .....................7813.1.6 Client-controlled Behavior ...............................7913.2 Expiration Model ............................................7913.2.1 Server-Specified Expiration ..............................7913.2.2 Heuristic Expiration .....................................8013.2.3 Age Calculations .........................................8013.2.4 Expiration Calculations ..................................8313.2.5 Disambiguating Expiration Values .........................8413.2.6 Disambiguating Multiple Responses ........................8413.3 Validation Model ............................................8513.3.1 Last-Modified Dates ......................................86Fielding, et al. Standards Track [Page 4]RFC 2616 HTTP/1.1 June 199913.3.2 Entity Tag Cache Validators ..............................8613.3.3 Weak and Strong Validators ...............................8613.3.4 Rules for When to Use Entity Tags and Last-Modified Dates.8913.3.5 Non-validating Conditionals ..............................9013.4 Response Cacheability .......................................9113.5 Constructing Responses From Caches ..........................9213.5.1 End-to-end and Hop-by-hop Headers ........................9213.5.2 Non-modifiable Headers ...................................9213.5.3 Combining Headers ........................................9413.5.4 Combining Byte Ranges ....................................9513.6 Caching Negotiated Responses ................................9513.7 Shared and Non-Shared Caches ................................9613.8 Errors or Incomplete Response Cache Behavior ................9713.9 Side Effects of GET and HEAD ................................9713.10 Invalidation After Updates or Deletions ...................9713.11 Write-Through Mandatory ...................................9813.12 Cache Replacement .........................................9913.13 History Lists .............................................9914 Header Field Definitions ....................................10014.1 Accept .....................................................10014.2 Accept-Charset .............................................10214.3 Accept-Encoding ............................................10214.4 Accept-Language ............................................10414.5 Accept-Ranges ..............................................105
Page 2: eferred to as "HTTP/1.1", and is an
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 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
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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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Fielding, et al. Standards Track [P
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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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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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Network Working Group R. Fielding Request for Comments: 2616 ...

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