module ActionDispatch::Routing::Mapper::Base

which can be used to navigate to this mounted app.
This will generate the +exciting_path+ and +exciting_url+ helpers

mount(SomeRackApp => "some_route", :as => "exciting")

To customize this helper's name, use the +:as+ option:
the helper is either +some_rack_app_path+ or +some_rack_app_url+.
These are named after the class specified, so for the above example
All mounted applications come with routing helpers to access them.

mount(SomeRackApp => "some_route")

Alternatively:

mount SomeRackApp, :at => "some_route"

Mount a Rack-based application to be used within the application.

def mount(app, options = nil)
  if options
    path = options.delete(:at)
  else
    options = app
    app, path = options.find { |k, v| k.respond_to?(:call) }
    options.delete(app) if app
  end
  raise "A rack application must be specified" unless path
  match(path, options.merge(:to => app, :anchor => false, :format => false))
  self
end