If-Modified-Since enhancement

luotonen@ptsun00.cern.ch (Ari Luotonen)
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Date: Mon, 21 Mar 1994 21:21:04 --100
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From: luotonen@ptsun00.cern.ch (Ari Luotonen)
To: Multiple recipients of list <www-talk@www0.cern.ch>
Subject: If-Modified-Since enhancement
X-Listprocessor-Version: 6.0c -- ListProcessor by Anastasios Kotsikonas
Content-Length: 710

Since nobody objected, and some gave me feedback saying it was
a good idea, the HTTP spec now says:

       If the client has done a conditional GET and access is allowed, but
       the document has not been modified since the date and time specified
       in If-Modified-Since field, server responds with 304 status code, and
       does not send the document back to the client.
NEW:   Response headers are as if the client had originally sent a HEAD request.
NEW:   This way the server can upload a new expiry date and other necessary
NEW:   metainformation to the requesting client (often a caching proxy).
       This is to allow fast update of caches.
-- Cheers, Ari --