Added runserver validation to detect if DEBUG=False and ALLOWED_HOSTS is empty.

Refs #19875.

1 files changed, 5 insertions, 0 deletions

diff --git a/django/core/management/commands/runserver.py b/django/core/management/commands/runserver.py
index c4a0b78cd4..f5a701cd23 100644
--- a/django/core/management/commands/runserver.py
+++ b/django/core/management/commands/runserver.py
@@ -40,6 +40,11 @@ class Command(BaseCommand):
         return get_internal_wsgi_application()
 
     def handle(self, addrport='', *args, **options):
+        from django.conf import settings
+
+        if not settings.DEBUG and not settings.ALLOWED_HOSTS:
+            raise CommandError('You must set settings.ALLOWED_HOSTS if DEBUG is False.')
+
         self.use_ipv6 = options.get('use_ipv6')
         if self.use_ipv6 and not socket.has_ipv6:
             raise CommandError('Your Python does not support IPv6.')