allow iframe

app/controllers/application_controller.rb

@@ -1,10 +1,10 @@
 class ApplicationController < ActionController::Base
-  # Prevent CSRF attacks by raising an exception.
-  # For APIs, you may want to use :null_session instead.
 
   protect_from_forgery with: :null_session
   after_action :set_csrf_cookie
 
+  after_action :allow_iframe
+
   layout :false
 
   def frontend
@@ -13,8 +13,13 @@ class ApplicationController < ActionController::Base
 
   rescue_from ActionView::MissingTemplate do |exception|
   end
+
   protected
 
+  def allow_iframe
+    response.headers.except! 'X-Frame-Options'
+  end
+
   def set_app_domain
     @appDomain = request.domain
     @appDomain << ':' + request.port.to_s unless request.port.blank?