WebSocker request returns "Server disconnected without sending a response."

[dbalabka]

I'm GCP HTTPS Load Balancer with a uvicorn running on a backend listening HTTP 80 port. So, I'm receiving HTTPS requests and sending them using HTTP to the backend node.

The problem is that I'm constantly receiving:
"Server disconnected without sending a response."

I'm using:

• websockets==10.4
• uvicorn==0.21.1
• gradio==3.21.0

Communication example:

Did you have similar error responses because of incorrectly configured uvicorn or LB?