A nitpick.

I would have separate this according to use, so for production, putting something like the following in settings/production module:

ALLOWED_HOSTS+=['archive.softwareheritage.org']  # noqa

or

from .common import *
from .common import ALLOWED_HOST
ALLOWED_HOSTS+=['archive.softwareheritage.org']

ditto for the 'testserver' entry which i imagine goes inside the settings/tests module?

Cheers,