deploying Goliath on Heroku's cedar stack

Gemfile

source :gemcutter
 
gem 'goliath', :git => 'git://github.com/postrank-labs/goliath.git'
gem 'em-http-request', :git => 'git://github.com/igrigorik/em-http-request.git'
gem 'em-synchrony', :git => 'git://github.com/igrigorik/em-synchrony.git'
gem 'yajl-ruby'

hello.rb

require 'goliath'
require 'em-synchrony/em-http'
require 'em-http/middleware/json_response'
require 'yajl'
 
# automatically parse the JSON HTTP response
EM::HttpRequest.use EventMachine::Middleware::JSONResponse
 
class Hello < Goliath::API
 
  # parse query params and auto format JSON response
  use Goliath::Rack::Params
  use Goliath::Rack::Formatters::JSON
  use Goliath::Rack::Render
 
  def response(env)
    resp = nil
 
    if params['query']
      # simple GitHub API proxy example
      logger.info "Starting request for #{params['query']}"
      conn = EM::HttpRequest.new("http://github.com/api/v2/json/repos/search/#{params['query']}").get
      logger.info "Received #{conn.response_header.status} from Github"
      resp = conn.response
    else
      resp = env # output the Goalith environment
    end
 
    [200, {'Content-Type' => 'application/json'}, resp]
  end
end

Procfile

web: bundle exec ruby hello.rb -sv -e prod -p $PORT