text: Title: [FEEDBACK] Change "All data returned from APIs must be JSON serializable."
  Body: Sometimes in russian Telegram chats I read "Django was sexy in 2008-2012, but it looks legacy and outdated in 2019 now...". Thank you for share your opinion, I completely agree with your suggestions. This is the best way to answer them "No, Django is modern framework for modern web. And there is the Guide how to cook Django. How to make Django Great Again".
  
  Okay... 
  
  About APIs. Check this project. https://github.com/gluk-w/django-grpc/tree/master/tests Author tried to implement gRPC server with django project. Also https://github.com/grpc/grpc-web is stable now... So in my opinion line "All data returned from APIs must be JSON serializable." is incorrect. It's depends on API types...