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copied!<p>Looks like solved it:</p> <ul> <li>Removed the proxy via header</li> <li>Added a Last-Modified header</li> <li>Added a far-future expires date</li> </ul> <p>Firebug still shows 200 responses from the origin server, however, YSlow recognizes the images as cached. According to YSlow, total image download size when fresh is greater than 500K; with the cache primed, it shows 0K download size.</p> <p>Here is the response header from the Origin server which does the trick:</p> <pre><code>Date: Tue, 24 Nov 2009 08:54:24 GMT Server: Apache/2.2.11 (Ubuntu) mod_apreq2-20051231/2.6.0 mod_perl/2.0.4 Perl/v5.10.0 Last-Modified: Sun, 22 Nov 2009 07:28:25 GMT Expires: Tue, 30 Nov 2010 19:00:25 GMT Content-Length: 10883 Content-Type: image/jpeg Keep-Alive: timeout=15, max=89 Connection: Keep-Alive </code></pre> <p>Because of the way I'm requesting the images, it really should not matter if these dates are static; my app knows the last mod time before requesting the image and appends this to the request URL on the client side to create a unique URL for each image version, e.g. <a href="http://myserver.com/img/125.jpg?20091122" rel="nofollow noreferrer">http://myserver.com/img/125.jpg?20091122</a> (the info comes from a AJAX JSON feed). I could, for example, make the last modified date 01 Jan 2000, and the Expires date sometime in the year 2050.</p> <p>If YSlow is correct -- and performance testing implies it is -- then FireBug should really report these local cache hits instead of a 200 response.</p>

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