Cannot display my rails 4 app in iframe even if 'X-Frame-Options' is 'ALLOWALL'

Question

I am trying to test a responsive design. I am using Rails 4. I know it sets \'X-Frame-Options\' to SAME ORIGIN. So I overrided it in development.rb using

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Answer 1

If you want to have this change take effect in all environments, place it in application.rb.