nginx反向代理websocket

        location /demo/ {
            proxy_set_header   Host $host:$proxy_port;
            proxy_redirect off;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "Upgrade";
            proxy_connect_timeout 60;
            proxy_read_timeout 600;
            proxy_send_timeout 600;
            proxy_pass http://127.0.0.1:3682/;
        }

最主要的两个参数：

proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";

注：Upgrade和Connection头部字段协商协议升级