A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : The Key HTTP Response Header Field
Authors : Roy T. Fielding
Mark Nottingham
Filename : draft-fielding-http-key-03.txt
Pages : 17
Date : 2015-09-23
Abstract:
The 'Key' header field for HTTP responses allows an origin server to
describe the secondary cache key ([RFC7234], section 4.1) for a
resource, by conveying what is effectively a short algorithm that can
be used upon later requests to determine if a stored response is
reusable for a given request.
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 request header 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:
https://tools.ietf.org/html/draft-fielding-http-key-03
A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-fielding-http-key-03
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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