ErrorDocument 404 /404.php
Header add "disablevcache" "true"

<ifModule mod_deflate.c>  
AddOutputFilterByType DEFLATE text/html text/plain text/xml application/xml application/xhtml+xml text/css text/javascript application/javascript application/x-javascript  
</ifModule>  

<FilesMatch "\.(jpg|jpeg|png|gif|swf|js|css)$">
Header set Cache-Control "max-age=604800, public"
</FilesMatch>