.htaccess

    <IfModule mod_expires.c>
    ExpiresActive On
    ExpiresDefault "access 7 days"
    ExpiresByType application/javascript "access plus 1 year"
    ExpiresByType text/javascript "access plus 1 year"
    ExpiresByType text/css "access plus 1 year"
    ExpiresByType text/html "access plus 7 day"
    ExpiresByType text/x-javascript "access 1 year"
    ExpiresByType image/gif "access plus 1 year"
    ExpiresByType image/jpeg "access plus 1 year"
    ExpiresByType image/png "access plus 1 year"
    ExpiresByType image/jpg "access plus 1 year"
    ExpiresByType image/x-icon "access 1 year"
    ExpiresByType application/x-shockwave-flash "access 1 year"
    </IfModule>

    <ifModule mod_headers.c>
    <filesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|swf)$">
    Header set Cache-Control "max-age=2592000, public"
    </filesMatch>
    <filesMatch "\.(css|js)$">
    Header set Cache-Control "max-age=2592000, public"
    </filesMatch>
    <filesMatch "\.(xml|txt)$">
    Header set Cache-Control "max-age=172800, public, must-revalidate"
    </filesMatch>
    <filesMatch "\.(html|htm|php)$">
    Header set Cache-Control "max-age=172800, private, must-revalidate"
    </filesMatch>
    </ifModule>

    <IfModule mod_setenvif.c>
    BrowserMatch "MSIE" force-no-vary
    BrowserMatch "Mozilla/4.[0-9]{2}" force-no-vary
    </IfModule>