title: Exception from cURL when attempting to arc diff (Error code 56)
body: <p>Im attempting to <code>arc diff</code> a local commit to a remote repository on bitbucket using Arcanist for Phabricator. This is the first time I have seen this error and I can not seem to find similar information on the internet. I have attempted <code>arc diff</code>-ing other branches and it works as expected.</p>
  
  <blockquote>
    <p>[cURL/56] (<a href="https://phabricator.website.com.au/api/differential.creatediff" rel="nofollow">https://phabricator.website.com.au/api/differential.creatediff</a>)  The cURL library raised an error while making a request. You may be able to find more information about this error (error code: 56) on the cURL site: <a href="http://curl.haxx.se/libcurl/c/libcurl-errors.html#CURLERECVERROR" rel="nofollow">http://curl.haxx.se/libcurl/c/libcurl-errors.html#CURLERECVERROR</a></p>
  </blockquote>
  
  <p>The information on the error in the link suggested states:</p>
  
  <blockquote>
    <p>CURLE_RECV_ERROR (56)</p>
    
    <p>Failure with receiving network data.</p>
  </blockquote>