[Python] Invalid HTTP_HOST header: '0.0.0.0:8000'. You may need to add '0.0.0.0' to...

Django does not seem to find my host 0.0.0.0

I have already added "0.0.0.0" to my ALLOWED_HOSTS. In fact, if I print(ALLOWED_HOSTS) I get ['localhost', '127.0.0.1', '0.0.0.0', '[::1]']. I am working in docker. Is there anything I am overlooking?

.env.dev


DEBUG=1
SECRET_KEY=foo
DJANGO_ALLOWED_HOSTS=localhost 127.0.0.1 0.0.0.0 [::1]
SQL_ENGINE=django.db.backends.postgresql
SQL_DATABASE=xxxx
SQL_USER=xxxx
SQL_PASSWORD=xxxx
SQL_HOST=db
SQL_PORT=5432
DATABASE=postgres


env_settings.py

import os

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = os.environ.get("SECRET_KEY")

# SECURITY WARNING: don't run with debug turned on in production!
# DEBUG = True
DEBUG = int(os.environ.get("DEBUG", default=0))

ALLOWED_HOSTS = os.environ.get("DJANGO_ALLOWED_HOSTS").split(" ")

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


settings.py

from core.env_settings import *

print(ALLOWED_HOSTS)

"""
print(ALLOWED_HOSTS) returns ['localhost', '127.0.0.1', '0.0.0.0', '[::1]']
"""


NB: I have carefully reviewed all similar questions posted here and there's none with this specific problem.

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