nginx configuration

[agusputra]

I follow this :
https://docs.nodebb.org/en/latest/configuring/proxies/nginx.html#configuration

But I get error each time refresh (F5).

Browser console output :

WebSocket connection to 'ws://188.166.229.163/socket.io/?EIO=3&transport=websocket&sid=272_fqLIM0WJupWXAAA1' failed: Error during WebSocket handshake: Unexpected response code: 400

Please help.