Django, Next.JS: CORS header ‘Access-Control-Allow-Origin’ missing, CORS request did not succeed even though django-cors-headers is defined

Question

I am stuck with the old and confusing issue of CORS with Django and Next.JS. My setup: OS: Windows 10, Browser: Mozilla: 84.0.2 (64-bit), Django: 3.1, Next.JS: 10.

My