I am pretty new to nginx, I host my rails application on nginx+passenger. I want my website to be accessible to only one domain. So I set my nginx conf like the following:

server {
    listen       80;
    server_name  mydomain.com www.mydomain.com;
    root /var/deploy/myapp/current/public;
    passenger_enabled on;

    location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
        expires 1y;
        add_header    Cache-Control  public;
    }
 }

I specify the server_name directive, but still, it answers anything which points to this IP and I could see that in the access.log that it answers to other domain names.

Is there anything I am doing wrong?