I am using Facebooker for Facebook Connect with Rails 2.3.5 with the rails_xss plugin, which escapes HTML by default unless you use raw.
I recently started seeing exceptions that looked like this:
The top of the HTML contains a <fb:fbml> tag which led me to suspect Facebooker. A quick git bisect confirmed this. But why is it happening?
I spent some time looking through the Facebooker source code and located the suspicious-sounding facebooker_pretty_errors.rb file. Sure enough, that file renders a template for errors that look good on the Facebook Canvas (assuming you’re not using rails_xss anyway…).
Fortunately, it is easy to turn this off, by setting this in your facebooker.yml file:
development: pretty_errors: true
Now it’s back to normal, and I can read my exceptions again.
