Is django's SCRIPT_NAME applied to STATIC_URL? - django

Question

I'm serving django with gunicorn and nginx. And I've observed a strange behavior, which looks like django is prefixing MEDIA_URL with SCRIPT_NAME but it is not prefixing the STATIC_URL. Am I handling it properly?
My static's configuration:
STATIC_URL = "backend/static/" # this looks odd but works
STATIC_ROOT = "/var/www/static"
STATICFILES_DIRS = [BASE_DIR / "static"]
MEDIA_URL = "media/" # this looks fine
MEDIA_ROOT = "/var/www/media"
gunicorn configuration:
[Service]
User=www-data
Group=www-data
Environment="DJANGO_SETTINGS_MODULE=backend.settings.production"
WorkingDirectory=/var/www/backend
ExecStart=/var/www/backend/venv/bin/gunicorn \
--access-logfile - \
--workers 3 \
--bind unix:/run/gunicorn.sock \
backend.wsgi:application
nginx configuration:
location ^~ /backend {
proxy_set_header SCRIPT_NAME /backend;
include proxy_params;
proxy_pass http://unix:/run/gunicorn.sock;
location ^~ /backend/static {
alias /var/www/static/;
}
location ^~ /backend/media {
alias /var/www/media/;
}
}
//edit
from django sources
def __getattr__(self, name):
"""Return the value of a setting and cache it in self.__dict__."""
if (_wrapped := self._wrapped) is empty:
self._setup(name)
_wrapped = self._wrapped
val = getattr(_wrapped, name)
# Special case some settings which require further modification.
# This is done here for performance reasons so the modified value is cached.
if name in {"MEDIA_URL", "STATIC_URL"} and val is not None:
val = self._add_script_prefix(val)
elif name == "SECRET_KEY" and not val:
raise ImproperlyConfigured("The SECRET_KEY setting must not be empty.")
self.__dict__[name] = val
return val
So why is it working so oddly?