rails 4: custom error pages for 404, 500 and where is the default 500 error message coming from?

Question

Currently in production im getting this text:

500 Internal Server Error
If you are the administrator of this website, then please read this web application\'         


        

Answer 1

The Error you are experiencing is being thrown from

https://github.com/rails/rails/blob/4-0-stable/actionpack/lib/action_dispatch/middleware/show_exceptions.rb#L18-L22

This means, the code your exceptions are getting rescued by are themselves throwing exceptions. You can check your logs for text:

Error during failsafe response:

to identify what the exceptions really are originating from and thus solve your problem.