Hi I'm using Docker to build a Django web application via Docker-Compose and it uses the .env.dev file for the environmental variables. The problem is the CSRF_TRUSTED_ORIGINS variables : If i put variables inside the settings.py => Ok If i put variables inside the env.dev => KO ( AttributeError: 'NoneType' object has no attribute 'split') settings.py # CSRF_TRUSTED_ORIGINS=["https://www.site1.fr", "http://www.site1.fr"] CSRF_TRUSTED_ORIGINS= os.environ.get("DJANGO_CSRF").split(" ") env.dev DJANGO_CSRF=https://www.site1.fr http://www.site1.fr Continue reading...