nginx configuration

[agusputra]

I follow this :

Configuring nginx as a proxy — NodeBB 1.x documentation

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.