title: Favicon not found in production mode
body: <p>Firefox does not find the favicon of my Rails 3.1 app in production mode. Running in development mode, it works.</p>
  
  <p>I browse to the URL <code>localhost:4000/favicon_standing.ico</code> for both modes.
  The favicon is located in my public folder of my app. I do not use the asset pipeline for it.
  I start the server using <code>rails s -p 4000 -e production</code> and <code>rails s -p 4000</code>, respectively, using WEBrick.</p>
  
  <p>Why does is for in development mode, but not in production mode?</p>