RFC 2295 (rfc2295) - Page 1 of 58

Transparent Content Negotiation in HTTP

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Network Working Group                                         K. Holtman
Request for Comments: 2295                                           TUE
Category: Experimental                                           A. Mutz
                                                         Hewlett-Packard
                                                              March 1998


                Transparent Content Negotiation in HTTP

Status of this Memo

   This memo defines an Experimental Protocol for the Internet
   community.  It does not specify an Internet standard of any kind.
   Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1998).  All Rights Reserved.

ABSTRACT

   HTTP allows web site authors to put multiple versions of the same
   information under a single URL.  Transparent content negotiation is
   an extensible negotiation mechanism, layered on top of HTTP, for
   automatically selecting the best version when the URL is accessed.
   This enables the smooth deployment of new web data formats and markup
   tags.

TABLE OF CONTENTS

   1  Introduction................................................4
    1.1 Background................................................4

   2  Terminology.................................................5
    2.1 Terms from HTTP/1.1.......................................5
    2.2 New terms.................................................6

   3  Notation....................................................8

   4  Overview....................................................9
    4.1 Content negotiation.......................................9
    4.2 HTTP/1.0 style negotiation scheme.........................9
    4.3 Transparent content negotiation scheme...................10
    4.4 Optimizing the negotiation process.......................12
    4.5 Downwards compatibility with non-negotiating user agents.14
    4.6 Retrieving a variant by hand.............................15
    4.7 Dimensions of negotiation................................15



Holtman & Mutz                Experimental
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