From: koen@win.tue.nl (Koen Holtman)
Message-Id: <199611212301.AAA02959@wsooti04.win.tue.nl>
Subject: Content negotiation draft 04 submitted
To: http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
Date: Fri, 22 Nov 1996 00:01:24 +0100 (MET)
Cc: koen@win.tue.nl (Koen Holtman)
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We have just submitted version 04 of the transparent content
negotiation draft to the internet drafts editor. I have made .txt,
.html, and versions with changebars available at
<URL:http://gewis.win.tue.nl/~koen/conneg/>
Our tentative planning is to submit this draft, or a revision thereof,
to the to the IESG as a Proposed Standard after discussion at the
December IETF.
ABSTRACT
HTTP allows one to put multiple versions of the same
information under a single URL. Transparent content
negotiation is a 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.
Design goals for transparent content negotiation include: low
overhead on the request message size, downwards compatibility,
extensibility, enabling the rapid introduction of new areas of
negotiation, scalability, low cost for minimal support, end
user control, and good cacheability.
Revision History
Major functional changes with respect to version 03 are:
- The model for the caching of variant lists has been changed
extensively. (The previous version had a problem with downwards
compatibility.)
- The definition of the Negotiate header has been changed to
include a `trans' keyword.
- The form `ftag=<N-M>', with N-M a range of numeric values, was
added to the feature expressions and feature predicates.
Major changes in the presentation are:
- Feature tag registration is now covered in a separate draft
- Some new explanatory material was added
- Some existing text has been improved
Happy reading!
Koen.
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