'reactive' or 'agent-driven' content negotiation query

I'm gearing up to submitting some comments on content negotiation to
the HTTPbis review process, and in that connection I'm looking for
deployed examples of _automated_ client-side selection of alternative
formats made available in a 300 Multiple Choices server response.

This might take the form of some kind of script-based intervention in
a browser, or it might be some narrower negotiation process between a
more tightly-coupled client-server pairing, or ...

See [1] [2] for details.

Anyone?

ht

[1] http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-24#section-3.4.2
[2] http://tools.ietf.org/html/rfc2616#section-12.2
-- 
       Henry S. Thompson, School of Informatics, University of Edinburgh
      10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440
                Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
                       URL: http://www.ltg.ed.ac.uk/~ht/
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Received on Friday, 1 November 2013 19:05:22 UTC