How to prevent access to a specific link by everyone except the Django server?

Question

Django

Hello, I have an API, which I would like to be able to access only the server itself when it performs any actions, but a normal user does not, how to do this?

class FlatsViewSet(viewsets.ModelViewSet):
    permission_classes = [IsAdminUser]

I tried this, a normal user cannot use the functionality that is used on the site when accessing the API