title: nginx matching wildcard subdomains without me asking to do this
body: <p>I have the following server block</p>
  
  <pre><code>server{
     listen 80;
     server_name foo.domain.com;
     root /some/rails/app;
     passenger_enabled on;
  }
  </code></pre>
  
  <p>However any subdomain under domain.com is matched using this block and is served by my rails app, so a.domain.com, nothing.domain.com, all are being sent to the rails app, how can I prevent this wildcard behavior which I didn't ask for ?</p>