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This article shows 2 awesome ways to implement caching on your website using Apache .htaccess (httpd.conf) files on the Apache Web Server .
This code will not do what you expect, because the first rule will match anything the second rule might match.
The second version of the mod_rewrite Cheat Sheet, a quick reference guide for mod_rewrite, with rewrite flags, regular expression syntax and sample rules.
<ifModule> more clever stuff here </ifModule>