application.rb

  class Application < Rails::Application
    config.middleware.insert_after ActionDispatch::Session::CookieStore,
                                   FayeRails::Middleware,
                                   extensions: [Faye::Extensions::AuthenticationExtension.new],
                                   engine: { type: Faye::Redis, host: 'localhost' },
                                   mount: '/rt',
                                   timeout: 25 do
      map '/runbook/**' => RealtimeController
    end
    ...