31920: Stream - WebSocket - Handshake Error

The server has returned an HTTP code different from 101 to the connection request sent by stream

See https://tools.ietf.org/html/rfc6455#section-4 for details.

• The server does not support WebSocket
• The WebSocket protocol is not enabled for the requested URL

• Verify WebSocket protocol is enabled in the server
• Verify the path in TwiML URL is actually the one supporting WebSocket