Nginx socket.io 反向代理配置

 location / {            root   html;            index  index.html index.htm;            proxy_pass http://127.0.0.1:3000;            proxy_redirect off;            proxy_set_header Host $host;            proxy_set_header X-Real-IP $remote_addr;            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;            proxy_http_version 1.1;            proxy_set_header Upgrade $http_upgrade;            proxy_set_header Connection "upgrade";        }