title: httpie gives me an error on macosx 'HTTPConnection'
body: <p>I'm working on macosx and I try to use httpie (with Symfony2 and FOSRestBundle).
  I follow different tutorial on how to install <code>httpie</code>.</p>
  
  <p>When I try to launch with: <code>http httpie.org</code></p>
  
  <p>I received the following error :</p>
  
  <pre><code>http: error: AttributeError: 'HTTPConnection' object has no attribute '_tunnel_host'
  </code></pre>
  
  <p>I can't find anything on Google.</p>
  
  <p>Do I have to configure something special or do I have to install another thing ?</p>
  
  <p>Thanks !</p>