Add Expires headers There are 21 static components without a far-future expiration date. http://static.doers.lk/examples-offline.css http://static.doers.lk/
You can add them in your htaccess file or vhost configuration.
See here : http://httpd.apache.org/docs/2.2/mod/mod_expires.html
But unless you own those domains .. they are our of your control.