[Rails] Devise omniauth-facebook redirect_uri isn't an absolute URI

thanks a lot for the advise. I migrated to Heroku and I have the following problem with facebook omniauth authentication. When I authenticate with facebook the callback URL does not work and I get sent to the homepage https://barteringapps.herokuapp.com/#_=_ with the following log error message : "redirect_uri isn't an absolute URI. Check RFC 3986.","type":"OAuthException","code":191,"fbtrace_id":"BT1wrRRo64m" method=GET path="/" host=barteringapps.herokuapp.com request_id=8913218f-703d-4da0-9388-f59d3a97bb69 fwd="81.171.81.200" dyno=web.1 connect=0ms service=11ms status=200 bytes=13425 In development the functionality works when I set callback-url in devise.rb and in the facebook App settings to http://127.0.0.1:5000/users/auth/facebook/callback So to give a more detailed log (I omitted not important infos): I click on the link for the sign in method=GET path="/users/sign_in" host=barteringapps.herokuapp.com fwd="81.171.81.200" status=200 I click for the sign in with facebook method=GET path="/users/auth/facebook" host=barteringapps.herokuapp.com fwd="81.171.81.200" status=302 INFO -- omniauth: (facebook) Request phase initiated. Callback from facebook, I notice that the path does not include my host method=GET path="/users/auth/facebook/callback?code='sometoken'" host=barteringapps.herokuapp.com fwd="81.171.81.200" I already searched Stackoverflow for a solution and I followed this instructions Devise omniauth-facebook redirect_uri Url must absolute I added :client_options I configured the absolute path like so in devise.rb callback_url: ENV['SERVER_ROOT']+'/users/auth/facebook/callback' In heroku settings I added the SERVER_ROOT env variable I have also the following doubts, as I had many problems with env Varibles, I installed foreman gem for my development. Foreman works as my webserver and loads the ENV Variables from a env file. I have also a Procfile with the follwing code: web: bundle exec rails s .env Procfile The problem is that production still runs with puma and without Procfile => Booting Puma => Rails 5.0.1 application starting in production on http://0.0.0.0:21255 => Run `rails server -h` for more startup options [4] Puma starting in cluster mode... Thanks a lot for your help Please give me a comment or just any tip to help me solve this Fabrizio Bertoglio

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