title: Apiary Proxy Request Timed Out
body: <p>I'm trying to use Apiary to document my API and test requests but I keep getting a response 504 Proxy Request Timed Out. 
  My API is running on my machine under <a href="http://localhost:3000/" rel="nofollow">http://localhost:3000/</a> and I specified that under the HOST metadata. 
  When I click compare under the call, it shows that Apiary added a header "host" that specifies a user specific proxy. 
  Is there something I am missing or does Apiary just not like localhosts? </p>