.htaccess rules to set cache control.

.htaccess-mod_headers

<IfModule mod_headers.c>
Header set Connection keep-alive

# Cache-control headers
    # 2 HOURS
    #<filesMatch "*">
        Header set Cache-Control "max-age=7200, must-revalidate"
    #</filesMatch>

    # 480 weeks - 290304000
    # 2 WEEKS
    <filesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|swf)$">
        Header set Cache-Control "max-age=1209600, public"
    </filesMatch>

    # 1 DAY
    <filesMatch "\.(css)$">
        Header set Cache-Control "max-age=86400, public, must-revalidate"
        #Header set Cache-Control "max-age=0, public, must-revalidate"
    </filesMatch>

    # 2 DAYS
    <filesMatch "\.(xml|txt)$">
        Header set Cache-Control "max-age=172800, public, must-revalidate"
    </filesMatch>

    # 2 HOURS
    <filesMatch "\.(html|htm)$">
        Header set Cache-Control "max-age=7200, must-revalidate"
    </filesMatch>

    <FilesMatch "\.(gif|jpg|png|ico|css|js|pdf|txt)$">
        Header append Cache-Control "public"
    </FilesMatch>
</IfModule>