Specify a Vary: Accept-Encoding Header

Many WordPress performance plugins are bloated and include features that you don’t need. This plugin does just one thing. It adds a “Vary: Accept-Encoding Header” to boost website performance.

When browsers make a request, they include HTTP headers for the server to decide what to send back. The Vary header describes what information identifies a request. Caches should only be used if the request matches the Vary information in the cache.

This plugin adds a rewrite rule to your WordPress directory’s .htaccess Apache file.