Mount rails app in rack cascade

gistfile1.rb

#This is psudocode, but should be an okay example...

# Step 1: require rails' environment
require 'path/to/config/environment'

# Step 2: add rails app to cascade:

run Rack::Cascade.new([
  rack_app1,
  MyRailsApp::Application, # Place rails in the cascade where you need it
  rack_app2
])