title: rails handle 404 with url redirect
body: <p>I am looking to use rails to redirect links that I am sure are out there on the internet from an old domain of mine to a new one.</p>
  
  <p>I would like to take address example.com/about ( about will not exist anymore) </p>
  
  <p>and in my application_controller to take the 404, inspect the url and then redirect to</p>
  
  <p>newexample.com/about</p>
  
  <p>what's the best way to do this?</p>