nginxをリバースプロキシにする

nginx.conf

    map $http_upgrade $connection_upgrade {
        default upgrade;
        '' close;
    }

    upstream nap {
        server 127.0.0.1:8080;
    }

    server {
        listen       80;
        server_name  localhost;

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

    }