class ActionDispatch::Cookies

def call(env)
  request = ActionDispatch::Request.new(env)
  response = @app.call(env)
  if request.have_cookie_jar?
    cookie_jar = request.cookie_jar
    unless cookie_jar.committed?
      response = Rack::Response[*response]
      cookie_jar.write(response)
    end
  end
  response.to_a
end