duplicated log lines in console

my app seems to be running fine in dev mode ( Rails4, Devise, OAuth2 , Doorkeeper ) but looking at the console , I can see all log lines duplicated … where should I look for any tricky bug or missing param ?anyway to get more info on what’s happening ? thanks a lot for feedback

(ruby-2.0.0@rails40)$ rails server -p 4000 => Booting WEBrick => Rails 4.0.0 application starting in development on http://0.0.0.0:4000 => Run rails server -h for more startup options => Ctrl-C to shutdown server [2013-08-22 12:42:08] INFO WEBrick 1.3.1 [2013-08-22 12:42:08] INFO ruby 2.0.0 (2013-06-27) [x86_64-darwin12.3.0] [2013-08-22 12:42:08] INFO WEBrick::HTTPServer#start: pid=13913 port=4000

Started GET “/oauth/authorized_applications” for 127.0.0.1 at 2013-08-22 12:42:12 +0200 Started GET “/oauth/authorized_applications” for 127.0.0.1 at 2013-08-22 12:42:12 +0200 Started GET “/users/sign_in” for 127.0.0.1 at 2013-08-22 12:42:13 +0200 Started GET “/users/sign_in” for 127.0.0.1 at 2013-08-22 12:42:13 +0200 Started POST “/users/sign_in” for 127.0.0.1 at 2013-08-22 12:46:39 +0200 Started POST “/users/sign_in” for 127.0.0.1 at 2013-08-22 12:46:39 +0200

[SOLVED] issue coming from rails_12factor gem ( to be used when deployed on Heroku in production) I modified my gem file…

heroku recommended gem

gem ‘rails_12factor’ , group: :production