Apache: How to add Expires headers to files without mod_expires installed?

In your htaccess (if that's an option) you can use a FilesMatch block with Header directives This requires mod_headers though, and I'm pretty sure that you can't specify a "rolling" expiration date (i.e. , "one year from now"). Therefore, you'll need to edit this setting, say, once a year 1 Also, did you see this question?1) Apparently you should refrain from setting the Expires to more than a year into the future: Do not set it the Expires header to more than one year in the future, as that violates the RFC guidelines (source: Optimize caching ).

In your . Htaccess (if that's an option) you can use a block with Header directives. This requires mod_headers, though, and I'm pretty sure that you can't specify a "rolling" expiration date (i.e.

, "one year from now"). Therefore, you'll need to edit this setting, say, once a year1. Also, did you see this question?1) Apparently you should refrain from setting the Expires to more than a year into the future: "Do not set it the Expires header to more than one year in the future, as that violates the RFC guidelines." (source: Optimize caching).

That worked. Thanks a lot. I don't mind editing it once a year.

– Hedge Nov 24 '10 at 17:26 @Hedge Great, it's an easy fix, after all. – jensgram Nov 25 '10 at 7:02.

You can use PHP to embed expiration headers, is not efficient as apache mod_expires, but as least it still able served for primed cache Using a far future Expires header affects page views only after a user has already visited your site. It has no effect on the number of HTTP requests when a user visits your site for the first time and the browser's cache is empty. Therefore the impact of this performance improvement depends on how often users hit your pages with a primed cache.(A "primed cache" already contains all of the components in the page.) We measured this at Yahoo!

And found the number of page views with a primed cache is 75-85%. By using a far future Expires header, you increase the number of components that are cached by the browser and re-used on subsequent page views without sending a single byte over the user's Internet connection. Source: developer.yahoo.com/performance/rules.ht....

Just send the Header yourself using header() header("Expires: Thu, 01 Dec 1994 16:00:00 GMT", true); Edit: Didn't see, that images, ... are also mentioned. This only works for php files or anything you pass-through php, which in most cases is not a really good idea.

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