default.conf

server {
    listen       80;
    server_name  domain.com;
    return       301 http://www.domain.com$request_uri;
}

server {
    listen       80;
    server_name  *.domain.com;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}

server {
    listen 80 default_server;
    location / {
        return 403;
    }
}