Rails 3.2でproduction環境の時にHEADメソッド（request.head?）が動作しない不具合を修正するパッチ

config.ru

# This file is used by Rack-based servers to start the application.

class SaveOriginalHttpMethod
  def initialize(app)
    @app = app
  end

  def call(env)
    env['rack.methodoverride.original_method'] = env['REQUEST_METHOD']
    @app.call(env)
  end
end
use SaveOriginalHttpMethod

require ::File.expand_path('../config/environment', __FILE__)
run MyApp::Application