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POIs my PHP script cache (public) friendly?
 

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    <p>I have finalized a small PHP application that can serve many documents. These documents <strong>must</strong> be cacheable by clients <strong>and</strong> proxies.</p> <p>Since proxies can cache my results I must be extra careful because the documents I serve can have different MIMEs types (content negotiation based on $_SERVER['HTTP_ACCEPT']) and different languages (based in this order: $_POST value / $_GET value / URL / PHP session value / $_COOKIE value / $_SERVER['HTTP_ACCEPT_LANGUAGE'] / default script value).</p> <p>To shortly sum up, a page can be served with many MIME type <strong>and</strong> many languages with the <strong>same</strong> URL (question changed: see edit below).</p> <p>To help cache on proxies I use the "Vary: Accept" header <strong>in combination</strong> with the ETag header. The ETags is a MD5 of the current language and the last modified timestamp.</p> <p>I always:</p> <ul> <li>Send an Expires header</li> <li>Send a Cache-Control header</li> <li>Send a Last-Modified header</li> <li>Send a Content-Type header</li> <li>Send an ETag header (based on current language and Last-Modified timestamp)</li> <li>Send a Content-Language</li> <li>Send a "Vary: Accept" header if the document is XHTML</li> </ul> <p>Now with my question: is this enough to help cache on proxies <strong>and</strong> clients? Did I miss a thing/header?</p> <p>To help you, here’s the HTTP response header for a test page (on my local environment):</p> <pre><code>" Date Wed, 30 Dec 2009 18:56:26 GMT Server Apache/2.0.63 (Win32) PHP/5.1.0 X-Powered-By PHP/5.1.0 Set-Cookie Tests=697daqbmple2e1daq2dg74ur96; path=/ Expires Wed, 30 Dec 2009 21:56:26 GMT Cache-Control public, max-age=10800 Last-Modified Mon, 28 Dec 2009 15:11:49 GMT Etag "44fa50be4638161a596e4b75d6ab7a94" Vary Accept Content-Language en-us Content-Length 3043 Keep-Alive timeout=15, max=100 Connection Keep-Alive Content-Type application/xhtml+xml; charset=UTF-8 " </code></pre> <p>EDIT: OK I understand that in this case serving a document with many MIMEs <strong>and</strong> having different languages (that can come from so many sources - see above) is just plain bad design. If you want to do this just use "private" cache (no cache on proxies)... Am I correct?</p> <p>If each language have it's own URL (but each URL can be served with many MIME still) is my current implementation is OK for a "public" cache (cache on clients + proxies)?</p>
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