If you’ve used Google Page Speed┬áthen you’ve probably seen “Leverage browser caching” as one of the items on the Medium Priority list. And it’s a real simple fix if you’re running Apache. Just create or edit your .htaccess file for the site you want to enable it on and input the following.

<IfModule mod_expires.c>
    ExpiresActive on
    ExpiresByType image/gif "access plus 1 years"
    ExpiresByType image/jpeg "access plus 1 years"
    ExpiresByType image/png "access plus 1 years" 
    ExpiresByType text/css "access plus 1 years"
    ExpiresByType text/js "access plus 1 years"
    ExpiresByType text/javascript "access plus 1 years"
    ExpiresByType application/javascript "access plus 1 years"
    ExpiresByType application/x-javascript "access plus 1 years" 
    #ExpiresDefault "access plus 1 days"
</IfModule>

And Viola, you’re now telling Web Browsers not to grab Images/CSS or Javascript unless otherwise required.