A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : The Key HTTP Response Header Field
Author(s) : Roy T. Fielding
Mark Nottingham
Filename : draft-fielding-http-key-02.txt
Pages : 10
Date : 2013-02-18
Abstract:
The 'Key' header field for HTTP responses allows an origin server to
describe the cache key for a negotiated response: a short algorithm
that can be used upon later requests to determine if the same
response is reusable.
Key has the advantage of avoiding an additional round trip for
validation whenever a new request differs slightly, but not
significantly, from prior requests.
Key also informs user agents of the request characteristics that
might result in different content, which can be useful if the user
agent is not sending Accept* fields in order to reduce the risk of
fingerprinting.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-fielding-http-key
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-fielding-http-key-02
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-fielding-http-key-02
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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