Using mod_expires conditionally depending on an environment variable

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http://serverfault.com – I've borrowed some mod_expires code from the HTML5 Boilerplate that adds some sensible defaults for asset expiry (I have filename version revving configured with htaccess so I can add mtimes before asset extensions like script.123456789.js): ExpiresActive on ExpiresDefault "access plus 1 month" # CSS ExpiresByType text/css "access plus 1 year" # Data interchange ExpiresByType application/json "access plus 0 seconds" ExpiresByType application/xml "access plus 0 seconds" ExpiresByType (HowTos)