cookie_jar.rb

class ActionDispatch::Cookies::CookieJar
  def self.build(request)
    env = request.env
    key_generator = env[GENERATOR_KEY]
    options = options_for_env env
    
    host = request.host
    
    new(key_generator, host, false, options).tap do |hash|
      hash.update(request.cookies)
    end
  end
end