title: Audit url open for permitted schemes. Allowing use of "file:" or custom schemes is often unexpected
body: <p>I am using this statement in Python</p>
  
  <pre><code> jsonreq = json.dumps({'jsonrpc': '2.0', 'id': 'qwer', 'method': 'aria2.pauseAll'})
   jsonreq = jsonreq.encode('ascii')
   c = urllib.request.urlopen('http://localhost:6800/jsonrpc', jsonreq)
  </code></pre>
  
  <p>In this I am getting this warning/error when I perform code quality test</p>
  
  <blockquote>
    <p>Audit url open for permitted schemes. Allowing use of "file:" or custom schemes is often unexpected. </p>
  </blockquote>