How do you set the expiry date or a maximum age in the HTTP headers for static resources in APACHE

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CSS

After running Google page speed online , it remarks that I should be: Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

And it lists a lot of plain images , my javascript files and the style sheets.

How can I set this expiry date for these static files ? I thought this was done automatically by the browser ?

i'm using APACHE 2.2.8

Posted 6-Nov-13 3:38am

TheSniper105

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Sergey Alexandrovich Kryukov 6-Nov-13 10:07am

You idea about "done automatically" looks weird to me. How a browser could possibly know expiration date if you don't tell it explicitly? And how would you make different dates for different resources?
—SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-11-06T04:10:00

The data "from local disk" you mention is called Web cache. Please see: http://en.wikipedia.org/wiki/Web_cache[^].

First of all, I would recommend this complete tutorial on cache control: http://www.mnot.net/cache_docs/[^].

Some more:
http://palizine.plynt.com/issues/2008Jul/cache-control-attributes/[^],
http://www.web-caching.com/[^].

—SA