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

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server SHOULD return them in the order that they appeared in therequest.Fielding, et al. Standards Track [Page 123]RFC 2616 HTTP/1.1 June 1999If the server ignores a byte-range-spec because it is syntacticallyinvalid, the server SHOULD treat the request as if the invalid Rangeheader field did not exist. (Normally, this means return a 200response containing the full entity).If the server receives a request (other than one including an If-Range request-header field) with an unsatisfiable Range requestheaderfield (that is, all of whose byte-range-spec values have afirst-byte-pos value greater than the current length of the selectedresource), it SHOULD return a response code of 416 (Requested rangenot satisfiable) (section 10.4.17).Note: clients cannot depend on servers to send a 416 (Requestedrange not satisfiable) response instead of a 200 (OK) response foran unsatisfiable Range request-header, since not all serversimplement this request-header.14.17 Content-TypeThe Content-Type entity-header field indicates the media type of theentity-body sent to the recipient or, in the case of the HEAD method,the media type that would have been sent had the request been a GET.Content-Type = "Content-Type" ":" media-typeMedia types are defined in section 3.7. An example of the field isContent-Type: text/html; charset=ISO-8859-4Further discussion of methods for identifying the media type of anentity is provided in section 7.2.1.14.18 DateThe Date general-header field represents the date and time at whichthe message was originated, having the same semantics as orig-date inRFC 822. The field value is an HTTP-date, as described in section3.3.1; it MUST be sent in RFC 1123 [8]-date format.Date = "Date" ":" HTTP-date
An example isDate: Tue, 15 Nov 1994 08:12:31 GMTOrigin servers MUST include a Date header field in all responses,except in these cases:Fielding, et al. Standards Track [Page 124]RFC 2616 HTTP/1.1 June 19991. If the response status code is 100 (Continue) or 101 (SwitchingProtocols), the response MAY include a Date header field, atthe server's option.2. If the response status code conveys a server error, e.g. 500(Internal Server Error) or 503 (Service Unavailable), and it isinconvenient or impossible to generate a valid Date.3. If the server does not have a clock that can provide areasonable approximation of the current time, its responsesMUST NOT include a Date header field. In this case, the rulesin section 14.18.1 MUST be followed.A received message that does not have a Date header field MUST beassigned one by the recipient if the message will be cached by thatrecipient or gatewayed via a protocol which requires a Date. An HTTPimplementation without a clock MUST NOT cache responses withoutrevalidating them on every use. An HTTP cache, especially a sharedcache, SHOULD use a mechanism, such as NTP [28], to synchronize itsclock with a reliable external standard.Clients SHOULD only send a Date header field in messages that includean entity-body, as in the case of the PUT and POST requests, and eventhen it is optional. A client without a clock MUST NOT send a Dateheader field in a request.The HTTP-date sent in a Date header SHOULD NOT represent a date andtime subsequent to the generation of the message. It SHOULD representthe best available approximation of the date and time of messagegeneration, unless the implementation has no means of generating areasonably accurate date and time. In theory, the date ought torepresent the moment just before the entity is generated. Inpractice, the date can be generated at any time during the messageorigination without affecting its semantic value.14.18.1 Clockless Origin Server Operation
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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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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 102 and 103: Fielding, et al. Standards Track [P
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
Page 126 and 127: must-revalidateBecause a cache MAY
Page 128 and 129: understand.For example, consider a
Page 130 and 131: new coding is known to be acceptabl
Page 132 and 133: 14.14 Content-LocationThe Content-L
Page 134 and 135: Note: while the definition of Conte
Page 138 and 139: Some origin server implementations
Page 140 and 141: Expires = "Expires" ":" HTTP-dateAn
Page 142 and 143: A client MUST include a Host header
Page 144 and 145: een modified since the date given b
Page 146 and 147: RFC 2616 HTTP/1.1 June 1999If none
Page 148 and 149: 14.29 Last-ModifiedThe Last-Modifie
Page 150 and 151: MAY require that behavior be consis
Page 152 and 153: yte-ranges-specifier = bytes-unit "
Page 154 and 155: Content) instead of 200 (OK).- The
Page 156 and 157: The TE request-header field indicat
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Page 162 and 163: SHOULD NOT, by default, forward the
Page 164 and 165: this user agent behavior in mind.Re
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Page 168 and 169: strongly correlated to the membersh
Page 170 and 171: serious security considerations. Co
Page 172 and 173: The HTTP protocol has evolved consi
Page 174 and 175: Protocol -- HTTP/1.0", RFC 1945, Ma
Page 176 and 177: Implementation and Analysis", RFC 1
Page 178 and 179: University of California, IrvineIrv
Page 182 and 183: Notes:1) Additional CRLFs may prece
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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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