title: No Log Output When Rails Server Started in Production Mode
body: <p>When I start the rails server in production mode and hit the root route, I get an error message and the server log remains unchanged.</p>
  
  <p>I'm using <code>RAILS_ENV=production rails server</code> to start the program. It's a Rails 5.2 app.</p>
  
  <p>When I start the server in development mode, everything works as expected.</p>
  
  <p>I expect the <code>home#index</code> action to get hit as defined in <code>config/routes.rb</code>, which renders a simple template (unchanged from generating it previously).</p>
  
  <p>Instead I see a 500 error in the network tab, and this message is displayed:</p>
  
  <pre><code>We're sorry, but something went wrong.
  If you are the application owner check the logs for more information.
  </code></pre>
  
  <p>Most troubling, I expect to at least see some changes in the server log but nothing happens.</p>
  
  <p>Update: I'm sure no other server is running on the same port, using <code>lsof -i :3000</code></p>