What's the difference between rack app vs. rails app?

Question

I uploaded my rails 2.3.8 app to DreamHost and got an error about rack version incompatibility. I issued a support ticket and the service guy recommended that I delete config.ru

Answer 1

you should check those two RailsCasts:

• http://railscasts.com/episodes/151-rack-middleware

• http://railscasts.com/episodes/150-rails-metal

• and perhaps: http://railscasts.com/episodes/222-rack-in-rails-3