How do I set expiration on CSS, JS and Images?

Question

I have recently analysed my website with pagespeed addon on firebug. It suggested me to set expiration on CSS, JS and image files.

I am wondering, how do I do this?

Answer 1

What I do is to create a file "expires.conf" and include it in the site file configuration of Apache. You can include in .htaccess if you want. My expires:

    ExpiresActive On
    ExpiresByType image/jpg "access 1 year"
    ExpiresByType image/jpeg "access 1 year"
    ExpiresByType image/gif "access 1 year"
    ExpiresByType image/png "access 1 year"
    ExpiresByType text/css "access 1 month"
    ExpiresByType text/html "access 1 month"
    ExpiresByType application/pdf "access 1 month"
    ExpiresByType text/x-javascript "access 1 month"
    ExpiresByType application/x-shockwave-flash "access 1 month"
    ExpiresByType image/x-icon "access 1 year"
    ExpiresDefault "access 1 month"

You need to activate the expires module in apache.