django/contrib/staticfiles/management/commands/runserver.py

from django.conf import settings
from django.contrib.staticfiles.handlers import StaticFilesHandler
from django.core.management.commands.runserver import Command as RunserverCommand


class Command(RunserverCommand):
    help = (
        "Starts a lightweight web server for development and also serves static files."
    )

    def add_arguments(self, parser):
        super().add_arguments(parser)
        parser.add_argument(
            "--nostatic",
            action="store_false",
            dest="use_static_handler",
            help="Tells Django to NOT automatically serve static files at STATIC_URL.",
        )
        parser.add_argument(
            "--insecure",
            action="store_true",
            dest="insecure_serving",
            help="Allows serving static files even if DEBUG is False.",
        )

    def get_handler(self, *args, **options):
        """
        Return the static files serving handler wrapping the default handler,
        if static files should be served. Otherwise return the default handler.
        """
        handler = super().get_handler(*args, **options)
        use_static_handler = options["use_static_handler"]
        insecure_serving = options["insecure_serving"]
        if use_static_handler and (settings.DEBUG or insecure_serving):
            return StaticFilesHandler(handler)
        return handler