At rackup start, the following Sinatra warning is displayed.
When launching directly the tommy.rb application, it doesn't show.
Ysul
$ bundle exec rackup -o 0.0.0.0 -p 4567 WARNING: If you plan to load any of ActiveSupport's core extensions to Hash, be sure to do so *before* loading Sinatra::Application or Sinatra::Base. If not, you may disregard this warning. [2018-09-21 09:23:55] INFO WEBrick 1.3.1 [2018-09-21 09:23:55] INFO ruby 2.2.10 (2018-03-28) [x86_64-freebsd11.2] [2018-09-21 09:23:55] INFO WEBrick::HTTPServer#start: pid=33125 port=4567