Conditional GET Proposal for HTTP Caching

"Roy T. Fielding" <fielding@simplon.ICS.UCI.EDU>
Date: Wed, 9 Mar 1994 23:20:07 --100
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From: "Roy T. Fielding" <fielding@simplon.ICS.UCI.EDU>
To: Multiple recipients of list <>
Subject: Conditional GET Proposal for HTTP Caching
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Hello all,

I made a proposal in January about providing a conditional GET
capability in HTTP.  It involves accepting a Last-modified header
in an HTTP request and sending the document only if the Last-modified
date of the document is more recent than the one in the request.

The full proposal is now available at

I was wondering whether any of the server authors are planning on
including this feature in future versions?

...Roy Fielding   ICS Grad Student, University of California, Irvine  USA