Pingdom Error – Vary: Accept-Encoding

I am testing out Swift to see if we can switch from our current caching system. Looks promising except for one test tool issue. After clearing Swift cache, Pingdom shows two warnings:

Leverage Browser Caching (red) – 2 Google Font calls
Specific a Vary: Accept-Encoding” header: (yellow) – shows it’s the Disqus plugin count.js file

Once I run Pingdom again, I se a -1 score:

The following publicly cacheable, compressible resources should have a “Vary: Accept-Encoding” header: (for domain.com).

Any ideas on how to fix this? Maybe something we could tweak in the .htaccess file?