rails 4 with iframe not working in rails 4?

Rails 4 added a default X-Frame-Options HTTP header value of SAMEORIGIN. This is good for security, but when you do want your action to be called in an iframe, you can do this:

To Allow all Origins:

class MyController < ApplicationController def iframe_action response.headers.delete "X-Frame-Options" render_something end end 

To Allow a Specific Origin:

class MyController < ApplicationController def iframe_action response.headers["X-FRAME-OPTIONS"] = "ALLOW-FROM http://some-origin.com" render_something end end 

Use :after_filter

When you need to use more than one of your action in an iframe, it's a good idea to make a method and call it with :after_filter:

class ApplicationController < ActionController::Base private def allow_iframe response.headers.delete "X-Frame-Options" end end 

Use it in your controllers like this:

class MyController < ApplicationController after_filter :allow_iframe, only: [:basic_embed, :awesome_embed] def basic_embed render_something end def awesome_embed render_something end # Other Actions... end 

Via: Rails 4: let specific actions be embedded as iframes

As already answered here: Ruby on rails 4 app does not work in iframe

There's a new default in Rails 4 which adds an header by default:

config.action_dispatch.default_headers = { 'X-Frame-Options' => 'SAMEORIGIN' } 

If you want to revert to the previous behaviour, just add the following in config/application.rb

config.action_dispatch.default_headers = { 'X-Frame-Options' => '' }