Nginx configurations

error_page 404 /404.shtml;

if ($host !~* ^www\.) {
   rewrite ^(.*)$ http://www.$host$1 permanent;
}

location ~* \.(jpg|jpeg|gif|css|ttf|woff|png|htc|gz|zip|swf|txt|flv|svg|ttf|atom|rss|svgz|cur|js|ico|html)$ {
   access_log off;
   expires 30d;
   add_header Pragma public;
   add_header Cache-Control "public, must-revalidate, proxy-revalidate";
}