##################################################################
            ##################   CACHING with "Cache-control"    #############
            ### Description: This block is not needed, if you use "EXPIRES" method for caching.
            #                 But if your hosting doesnt support "EXPIRES",  OR you just want
            #                 to use some specific options (i.e. revalidate,no-cache...), then
            #                 instead of "EXPIRES" method, use this block:
            ##################################################################
            <ifModule mod_headers.c>
                #max age is calculated in seconds (1 month = 2592000 )
                <filesMatch "\.(css|jpg|jpeg|png|gif|js|ico|pdf|flv|swf)$">
                    Header set Cache-Control "max-age=2592000, public"
                </filesMatch>
                <filesMatch "\.(xml|txt)$">
                    Header set Cache-Control "max-age=216000, public, must-revalidate"
                </filesMatch>
                <filesMatch "sitemap\.xml$">
                    Header set Cache-Control "max-age=500, private, no-cache"
                </filesMatch>
                <filesMatch "\.(x?html?|htm)$">
                    Header set Cache-Control "max-age=216000, private, must-revalidate"
                </filesMatch>
                <filesMatch "\.(php)$">
                    Header set Cache-Control "max-age=0, private, must-revalidate"
                </filesMatch>
            </ifModule>