http {
    upstream app_backend {
        server 127.0.0.1;
        server 127.0.0.1:8082;
        server backend.com;
        server backend-2.com weight=5;
        server backend-backup.org backup;
    }

    map $http_host $site_root {
        default /var/www/default; # Default root
        example.com /var/www/example_com;
        example.org /var/www/example_org;
    }

    server {
        listen 80 default_server;
        server_name _;

        root /var/www/default;

        location / {
            index index.html;
        }

        location /status {
            return 200 "Default server status: OK\n";
            add_header Content-Type text/plain;
        }
    }
}