title: Show a 404 instead of 500 in Rails
body: <p>In my rails app I have defined the routes so users can access records like <a href="http://mydomain.com/qwe2" rel="noreferrer">http://mydomain.com/qwe2</a></p>
  
  <p>But if they type a wrong "qwe2" they get a 500 page. I think a 404 would be more appropriate.</p>
  
  <p>How can I change the error page that is shown? Thanks</p>