title: Sending custom headers in websocket handshake
body: <p><strong>How to</strong> send custom headers in the first handshake that occurs in the WebSocket protocol?</p>
  
  <p>I want to use custom header in my initial request "<strong>**X-Abc-Def : xxxxx</strong>"</p>
  
  <p>WebSocket clients are Python &amp; Android client.</p>