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Re: Pragma header

From: Larry Masinter <masinter@parc.xerox.com>
Date: Tue, 3 Sep 1996 09:41:15 PDT
To: pball@hab-software.de
CC: www-talk@w3.org
Message-Id: <96Sep3.094115pdt."2733"@golden.parc.xerox.com>

HTTP/1.1 revises the cache directives of HTTP in a way that we
hope will allow caching to be reliable; you might want to review the
HTTP/1.1 spec and see if it accomplishes what you want.

For example, in the case where the result of a CGI program is
dependent on the "user-agent:" header, it's possible to specify
"Vary: user-agent". An intermediate cache can (if it wishes) choose to
cache the resulting document and serve it up again to other clients
with the same user agent field. If the origin server also supplies an
"Etag:" and is willing to support "If-match:", it's also possible to
note when 'equivalent' user agents are used and still not transmit the

(and .txt; note that the .ps file is over 100 pages long, and the text
version is longer).

The document's been approved to be published as an RFC, although it
might be a while before an RFC number is assigned and it is published.

Received on Tuesday, 3 September 1996 12:41:56 UTC

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