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                                            ruby-bot

The URL couldn't be validated. Callback verification failed with the following errors: HTTP Status Code = 502; HTTP Message = Bad Gateway

![wrong_verification](https://user-images.githubusercontent.com/30195894/28489005-6cbfd526-6ed5-11e7-90cc-034d9a0fe337.png) my heroku link is not working. I am making Facebook bot in ruby on rails, and this is giving error. I have attached screenshot of the error, please help...