nginx反向代理含ws的http

    location / {
            proxy_redirect off;
            proxy_set_header Host $http_host;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            # below three lines are for websocket.
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade"; # must be "upgrade"
            proxy_pass http://localhost:3000;
    }