title: standard way to disable X-powered-by header in Passenger?
body: <p>I couldn't find any way to disable Passenger's <code>X-Powered-By</code> header:</p>
  
  <pre><code>X-Powered-By: Phusion Passenger (mod_rails/mod_rack) 3.0.11
  </code></pre>
  
  <p>Is it possible to do that without <em>modifying its sources</em> and <em>removing headers on the HTTP server level</em>?</p>