[Answered ]-Django redirect /D/<anything> to /d/<anything>

You can make a view that directs with:

# some_app/urls.py

from django.views.generic import RedirectView

# …

urlpatterns = [
    path('d/', include(…)),
    path(
        'D/<path:path>',
        RedirectView.as_view(
            url='/d/%(path)s', query_string=True, permanent=True
        ),
    ),
]

Note that a redirect will however always result in a GET request, so even if the original request to D/something is a POST request for example, it will make a GET request to d/something.