Error analysis

websocket: the client is not using the websocket protocol: 'upgrade' token not found in 'Connection' head

WebSocketThis problem occurs when the reverse proxy or load balancer is not delivering the request correctly.

solution

Nginx plus the following analysis

proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection upgrade

Apache plus the following analysis

 <Location /ws>
     ProxyPass ws://localhost:8000
     ProxyPassReverse ws://localhost:8000/
 </Location>

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