заблокирован политикой CORS: нет «Access-Control-Allow-Origin»

Question

Я пытался настроить CORS Accept Headers в Rails для приема данных формы из другого домена с гемом 'rack-cors'

Access to XMLHttpRequest at 'https://xxx.herokuapp.com/xxx/' from origin 'https://2xxxw.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

application.rb

module Izanagi
  class Application < Rails::Application



    config.middleware.insert_before 0, Rack::Cors do
      allow do
        origins '*'
        resource '*', headers: :any, methods: [:get, :post, :options]
      end
    end
end 
end