与Nginx的Websocket握手错误

Question

我在网页中使用Socket.io，但它不起作用。在console.log我收到以下错误：

socket.io.js:2 WebSocket connection to 'ws://www.somewebpage.com/socket.io/?EIO=3&transport=websocket&sid=uoSGxATXKabezBn8AABP' failed: Error during WebSocket handshake: Unexpected response code: 400

我有这个Nginx配置：

location / {
    proxy_pass  http://melo;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Host $host;
}

我可以检查什么来解决这个问题？