Absolutely. I'm talking about things that should 404 are actually raising exceptions. E.g. https://feedi.me/popular. I hit this link by mistake but that should return a 404 and not the exception page from Rails.

This generally happens because config.consider_all_requests_local is set to true in production env. By default it should only be true in development and test.

yes because the correct request is https://feedi.me/feeds/popular not "https://feedi.me/popular"

Yes I understand that. But visiting your Rails app shouldn't bubble up the debugging info to your visitor in production.