Question

I’m trying to show some html in a facebook tab page without success…. I’m new in facebook applications and I do not understand what is happening.
I’ve created a heroku app, to use your SSL, named https://sinatra-dev-test.herokuapp.com, this URL only shows a H1 with a “Teste” string.
In my Sinatra Application I have a get route, and a post route that redirects to get.
The heroku logs do not show nothing in particular, no one error or warning.

Here is a screenshot to my facebook app config:

Answer 1

Sinatra has a protection for frame by default.

You need to use this:

set :protection, except: [:frame_options]

At your app.rb

This will allow you to use your website as a iframe.
Read more at http://www.sinatrarb.com/intro.html#Configuring%20attack%20protection