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

Waitangi," presented simultaneously in the original Maori and Englishversions, would call forContent-Language: mi, enHowever, just because multiple languages are present within an entitydoes not mean that it is intended for multiple linguistic audiences.An example would be a beginner's language primer, such as "A FirstLesson in Latin," which is clearly intended to be used by anEnglish-literate audience. In this case, the Content-Language wouldproperly only include "en".Content-Language MAY be applied to any media type -- it is notlimited to textual documents.14.13 Content-LengthThe Content-Length entity-header field indicates the size of theentity-body, in decimal number of OCTETs, sent to the recipient or,in the case of the HEAD method, the size of the entity-body thatwould have been sent had the request been a GET.Content-Length= "Content-Length" ":" 1*DIGITAn example isContent-Length: 3495Applications SHOULD use this field to indicate the transfer-length ofthe message-body, unless this is prohibited by the rules in section4.4.Fielding, et al. Standards Track [Page 119]RFC 2616 HTTP/1.1 June 1999Any Content-Length greater than or equal to zero is a valid value.Section 4.4 describes how to determine the length of a message-bodyif a Content-Length is not given.Note that the meaning of this field is significantly different fromthe corresponding definition in MIME, where it is an optional fieldused within the "message/external-body" content-type. In HTTP, itSHOULD be sent whenever the message's length can be determined priorto being transferred, unless this is prohibited by the rules insection 4.4.