Sinatra doesn't know this ditty even when default route is implemented with modular style
When you use the modular style, the Sinatra::Application app still exists, but usually nothing happens to it. In your config.ru you are running this (empty) app instead of your own. Simply change run Sinatra::Application to
run App
Override Sinatra default NotFound error page
Nevermind, found that all routes are matched in order, so after all routes I put get/post/put/delete '*' do ; end and that solves my problem.
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