Mapping multiple apps with Rack

config.ru

require 'rubygems'
require 'sinatra'
require './index'

run Rack::URLMap.new("/" => CoolApp.new, "/ohnice" => BetterApp.new)

index.rb

class CoolApp < Sinatra::Base
  get '/' do
    "Welcome to the internet."
  end
end

class BetterApp < Sinatra::Base
  get '/' do
    "The time is #{Time.now}."
  end
end