Grape API being served with Goliath

gistfile1.rb

#!/usr/bin/env ruby

# gem install grape --pre

# http://localhost:9000/hello.json
# => {"hello":"world"}

$:<< '../lib' << 'lib'

require 'goliath'
require 'grape'

class MyAPI < Grape::API
  
  get "hello" do 
    {:hello => "world"}
  end

end

class APIServer < Goliath::API

  def call(env)
    MyAPI.call(env)
  end
      
end