Following the readme will end up in an error on runserver as allowhosts is set to back4app not local

[ivwivw]

error: Invalid HTTP_HOST header: '127.0.0.1:8000'. You may need to add '127.0.0.1' to ALLOWED_HOSTS.

suggest: in settings.py
#ALLOWED_HOSTS = ['containersdjango-alysson.b4a.run','node26a.containers.back4app.com' ]
#set this for local testing and use line above for container on back4app
ALLOWED_HOSTS = ['127.0.0.1', 'localhost']

see my pull request