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Globally unique e-tags, if-match on content-ID, etc.

From: Larry Masinter <masinter@parc.xerox.com>
Date: Sat, 13 Sep 1997 07:57:01 PDT
Message-Id: <341AA9BD.A9FF3DCD@parc.xerox.com>
To: http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
One of the technical issues that came up in recent discussions
about "Push" technology is the usefulness, for some applications,
for a globally unique content-ID. While "content-ID" might be
a useful header in a response, there's no corresponding request
header, since the etag is only guaranteed unique relative to 
the given URL.

Can 'if-match' be extended to use content-IDs as well as
ETags? Or, can we add some space of 'globally unique etags'?

At the same time, there's a desire to have a kind of content-ID
that is based on MD5 or SHA to allow generation of the content-ID
from the content-MD5 value, for example, or to have it independently
generated.

I don't think these are necessarily action items for HTTP-WG,
but I thought I'd raise the issues.

Larry
-- 
http://www.parc.xerox.com/masinter
Received on Sunday, 14 September 1997 15:43:22 EDT

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