Ruby on Rails OmniAuth Facebook works for Live App on Heroku but not Test App on Cloud9 – Facebook api

I have been struggling to figure this problem out for weeks, and I just can’t figure it out.

I am managing a Ruby On Rails app that posts to Facebook. The development environment is in a Cloud9 IDE and the live site is hosted on Heroku. The app has a corresponding account with Developers.Facebook.com with a full app and a test app associated with it.

I have my Heroku settings working perfectly with the full Facebook App.

The problems start with the Cloud9 settings in the Facebook Test App. Whenever I attempt to connect via the API, I get the following error:

Immediately followed by this error:

I have tried using the following options for my URL but nothing seems to be working:

https://{workspace}-{username}.c9.io/
https://{workspace}-{username}.c9.io:80/
https://{workspace}-{username}.c9.io:8080/
https://{workspace}-{username}.c9users.io/
https://{workspace}-{username}.c9users.io:80/
https://{workspace}-{username}.c9users.io:8080/

Here’s my FacebookAccount model.

class FacebookAccount < ActiveRecord::Base
  belongs_to :user
  has_many :facebook_pages

  if Rails.env.production?
    FACEBOOK_APP_ID = ENV["FACEBOOK_APP_ID"]
    FACEBOOK_SECRET = ENV["FACEBOOK_SECRET"]
  else
    FACEBOOK_APP_ID = "XXXXXXXXXXXXXXX"
    FACEBOOK_SECRET = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
  end

  def self.from_omniauth(auth)
    oauth = Koala::Facebook::OAuth.new(FACEBOOK_APP_ID, FACEBOOK_SECRET)
    new_access_info = oauth.exchange_access_token_info auth.credentials.token
    new_access_token = new_access_info["access_token"]
    new_access_expires_at = DateTime.now + new_access_info["expires"].to_i.seconds
    where(provider: auth.provider, uid: auth.uid).first_or_initialize.tap do |facebook_account|
      facebook_account.provider         = auth.provider
      facebook_account.uid              = auth.uid
      facebook_account.name             = auth.info.name
      facebook_account.image            = auth.info.image
      facebook_account.email            = auth.info.email
      facebook_account.oauth_token      = new_access_token
      facebook_account.oauth_expires_at = new_access_expires_at
      facebook_account.save!
    end
  end
end