1 files changed, 3 insertions, 0 deletions
diff --git a/django/urls/resolvers.py b/django/urls/resolvers.py
index 2154a46320..2ff8b2c775 100644
--- a/django/urls/resolvers.py
+++ b/django/urls/resolvers.py
@@ -8,6 +8,7 @@ attributes of the resolved URL match.
 import functools
 import inspect
 import re
+import string
 from importlib import import_module
 from urllib.parse import quote
 
@@ -206,6 +207,8 @@ def _route_to_regex(route, is_endpoint=False):
     For example, 'foo/<int:pk>' returns '^foo\\/(?P<pk>[0-9]+)'
     and {'pk': <django.urls.converters.IntConverter>}.
     """
+    if not set(route).isdisjoint(string.whitespace):
+        raise ImproperlyConfigured("URL route '%s' cannot contain whitespace." % route)
     original_route = route
     parts = ['^']
     converters = {}