senchalabs/connect — pull request #904 by jonathanong (2013-09-27 21:54:38+00:00)
Title: Only set vary header if the filter check is passed

pulled, fixed, and rebased from #849
closes #848

note: i'd rather be liberal with the use of `vary`, but i don't think this will break anything since most CDNs only support `Accept-Encoding` in `Vary` headers.