title: How to render 500 page in rescue_from
body: <p>I would like to send e-mail when having an exception in my application and render the regular 500 page. I could not find how to perform the 500 page render:</p>
  
  <pre><code>class ApplicationController &lt; ActionController::Base
    rescue_from StandardError do
       send_email_of_error
       # what goes here? 
    end
  
    ...
  end
  </code></pre>