title: Abraham\TwitterOAuth doesn't work on appengine PHP
body: <p>The following code on PHP appengine works perfectly locally, but when I deploy to <a href="http://x.appengine.com" rel="nofollow">http://x.appengine.com</a> there is an issue</p>
  
  <p>Code:</p>
  
  <pre><code>&lt;?php 
  
      require "vendor/autoload.php";
      use Abraham\TwitterOAuth\TwitterOAuth;
  
      $CONSUMER_KEY = "[redacted]";
      $CONSUMER_SECRET = "[redacted]";
      $OAUTH_CALLBACK = "http://$_SERVER[HTTP_HOST]$_SERVER[HTTP_PORT]";
      $connection = new TwitterOAuth($CONSUMER_KEY, $CONSUMER_SECRET);        
      $request_token = $connection-&gt;oauth('oauth/request_token', array('oauth_callback' =&gt; $OAUTH_CALLBACK));
  
      var_dump($request_token);
  ?&gt;
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>array(1) { ["‹"]=&gt; string(0) "" } array(1) { ["‹"]=&gt; string(0) "" }
  </code></pre>
  
  <p>Any suggestions here? Thank you.</p>