title: Issue with "Serve" ruby gem and Apache server
body: <p>I host the same application to 2 difference serves (Serve: localhost:4000 and Apache:localhost:80):</p>
  
  <p>Here is the index.html source:</p>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;
      &lt;title&gt;&lt;/title&gt;
      &lt;script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;
      &lt;script type="text/javascript" language="JavaScript"&gt;
              var url = "http://shadow01.yumenetworks.com/dynamic_preroll_playlist.xml?domain=1552YmmwFStw";
              var successFn = function (data) {
                  console.log(data);
              };
              $.get(url, successFn);
      &lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  Hello
  &lt;/body&gt;
  &lt;/html&gt;&gt;
  </code></pre>
  
  <p>And then I those servers one by one, and check the console log. The Apache:localhost:80 return data, but the Serve: localhost:4000 return empty Data.</p>
  
  <p>Please help me know why?</p>
  
  <p>Thanks and Regards</p>