CORS enabled in Rails 4

application_controller.rb

class ApplicationController < ActionController::Base
  before_action :cors_set_access_control_headers

  def options
    head :ok
  end

  private
  def default_serializer_options
    { root: false }
  end

  def cors_set_access_control_headers
    headers['Access-Control-Allow-Origin'] = '*'
    headers['Access-Control-Allow-Methods'] = 'PUT, POST, GET, OPTIONS'
    headers['Access-Control-Request-Method'] = '*'
    headers['Access-Control-Allow-Headers'] = 'Content-Type, X-Requested-With, X-Prototype-Version'
  end
end

routes.rb

Rails.application.routes.draw do
  
  match '*path', to: 'application#options', via: :options

end