Nginx vhost configuration with a Rails app

example.com.conf

server {
    listen       80;
    server_name  example.com www.example.com;
    root   /home/demo/web/example.com/public;
    passenger_enabled on;
    index  index.html;
    
    charset  utf-8;
    
    access_log  /dev/null;
    error_log   /home/demo/web/example.com/log/error.log;
    
    error_page  404 /404.html;
    error_page  500 502 503 504  /50x.html;
}