Why is the 404 page not showing (Django)?

Question

Django

At the root of the project in the templates folder is the 404.html file. In settings.py DEBUG= False. When you navigate to a known unknown URL, a page is displayed that looks like:
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Not Found
The requested URL /test_404 was not found on this server.
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If DEBUG = True, then Page Not Found (404)...

Answer 1

Because in urls.py you need to write something like handler404 = 'mysite.views.my_custom_page_not_found_view' and then only do Debug=false