How to open websocket connection after running websocket.py

[graceliuu]

Typing localhost:9000 in my browser gives me an error:
Failed to open a WebSocket connection: invalid Connection header: keep-alive.
You cannot access a WebSocket server directly with a browser. You need a WebSocket client.

[AbhishekKaushikCV]

• I am also getting the same error. I am not able to launch the app.
• Did you solve this error?

[ShaneXiangH]

The same error for me. The application is just stuck on the LOADING... page, while nothing is loaded.