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    <p>Using a Reverse Proxy like Squid, Varnish or even Apache mod_cache would help you a lot regarding cache related HTTP headers. However if you need to have a full PHP version you should honor Cache-Control and then Expires because when Cache-Control and Expires are available in the same HTTP response Cache-Control takes precedence with the "max-age" attribute as described in <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.3" rel="nofollow">http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.3</a>:</p> <blockquote> <p>If a response includes both an Expires header and a max-age directive, the max-age directive overrides the Expires header, even if the Expires header is more restrictive. This rule allows an origin server to provide, for a given response, a longer expiration time to an HTTP/1.1 (or later) cache than to an HTTP/1.0 cache. This might be useful if certain HTTP/1.0 caches improperly calculate ages or expiration times, perhaps due to desynchronized clocks.</p> </blockquote> <p>You should also be very careful with the "no-cache" attribute which is kind of misleading as it requires a revalidation with the origin server, so it is a bit like a "store-but-do-no-serve-from-cache-without-revalidation" header.</p> <p>You can also ignore the Pragma header for two reasons:</p> <ul> <li>it is a request header, not a response header</li> <li>it is for HTTP 1.0 and the (almost entire) world is HTTP 1.1 now :)</li> </ul> <p>'Hope that helps :)</p>
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