Squid can do this easily. Just setup an acl that blocks requests for file extensions you don't want. acl Blocked_extensions urlpath_regex -i "/etc/squid3/blo

Squid can do this easily. Just setup an acl that blocks requests for file extensions you don't want. acl Blocked_extensions urlpath_regex -i "/etc/squid3/blocked.extensions.acl" http_access deny Blocked_extensions The contents of /etc/squid3/blocked.extensions.acl would be something like: \.css$ \.css\?.*$ \.js$ \.js\?.*$ \.woff$ \.woff\?.*$ \.eot$ \.eot\?.*$ \.svg$ \.svg\?.*$ It's also easy to run squid in transparent proxy mode if you want to support older devices that don't let you manually specify a proxy.