title: balebot not working with using ngrok
body: <p>I use ngrok to test the balebot on the local network. But error 502 occurs in network connection.
  ngrok listens to 8000 port</p>
  
  <pre><code>Config.base_url = "https://RANDOM.ngrok.io/"
  </code></pre>
  
  <p>error:</p>
  
  <pre><code>aiohttp.client_exceptions.WSServerHandshakeError: 502, message='Invalid response status'
  </code></pre>