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HTTP Protocol Extentions

From: Larry Masinter <masinter@parc.xerox.com>
Date: Thu, 11 Sep 1997 14:57:10 PDT
Message-ID: <34186936.B0AB4F96@parc.xerox.com>
To: Arthur van Hoff <avh@marimba.com>
CC: Push Workshop <www-push@w3.org>, DRP Mailing List <drp@marimba.com>
It seems like what you want is some kind of globally unique
ETag, e.g., such that a cache could presume that if it had
data with same globally unique ETag anywhere in its cache,
it could use that data; on the other hand, you also want
those etags to be 'global'

Since there are both 'strong' and 'weak' etags, maybe we could
add global etags too. For the most part, you can just use
them like (strong) etags, but the origin server guarantees
global uniqueness.

"Differential-ID" is a like range retrieval and has many of
the same caveats. The header name should reflect that it is
a modifier to the request rather than (just) an identifier.

Larry
Received on Thursday, 11 September 1997 17:57:36 EDT

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