My implementation of responder.rb

class ApplicationController < ActionController::Base
  protect_from_forgery
  
  class << self
    def responder *responders
      if responders.any?
        responder_class = Class.new(ActionController::Responder)
        responders.each do |responder|
          responder = responder.is_a?(Module) ? responder : "#{responder.to_s.classify}Responder".constantize
          responder_class.send(:include, responder)
        end
        self.responder = responder_class
      else
        super()
      end
    end
  end
end