Rails::WelcomeController

In Rails 3.x.x, we had a 'public/index.html' file and a 'rails.png' used in this file. Now, in Rails 4.0.0.rc1; we don't need to delete these files, because they are not exist. Instead of physically existing these files, Rails introduced a new internal controller: Rails::WelcomeController. This controller has been used to serve the dynamic welcome screen, and rails.png image used as a data-image.

References

Rails 4 Countdown To 2013 -> http://bit.ly/TJDuHX

Original GitHub Discussion -> http://bit.ly/T5LtyK