Goliath server with CORS middleware

goliath_cors.rb

#!/usr/bin/env ruby

require 'goliath'

class CORS
  include Goliath::Rack::AsyncMiddleware

  def post_process(env, status, headers, body)
    headers['Access-Control-Allow-Origin'] = '*'
    [status, headers, body]
  end
end

class HelloWorld < Goliath::API
  use CORS

  def response(env)
    [200, {}, "hello world"]
  end
end

# ruby goliath_cors.rb -sv