rtfd/readthedocs.org — pull request #785 by citruspi (2014-04-15 19:09:42+00:00)
Title: Added gzip_vary on; to the Nginx configuration

Adding `gzip_vary on;` to the Nginx configuration will add the `Vary: Accept-Encoding` header to responses.

This should improve performance, you can read more about it [here][0].

— @citruspi

[0]: http://blog.maxcdn.com/accept-encoding-its-vary-important/