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

I had the same problem as you, and searched for a solution to this problem all night.

I finally found out why it happens. It's because of the Chrome cache.

You can see the header['X-Frame-Options'] is ALLOWALL but it doesn't work.

Just try to open a "New Incognito Window" and go the same page and it works!

This problem only happened in development mode in my test. It worked fine in production mode.

Try just to delete this header 'X-Frame-Options'. Maybe this way in controller:

before_filter :allow_iframe_requests
...
def allow_iframe_requests
  response.headers.delete('X-Frame-Options')
end

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