[3.2.x] Fixed #32754 -- Made AdminSite.catch_all_view() respect SCRIPT_NAME.

Regression in ba31b01034.

Backport of f7691d4812 from main

django/contrib/admin/sites.py

@@ -420,14 +420,13 @@ class AdminSite:
     def catch_all_view(self, request, url):
         if settings.APPEND_SLASH and not url.endswith('/'):
             urlconf = getattr(request, 'urlconf', None)
-            path = '%s/' % request.path_info
             try:
-                match = resolve(path, urlconf)
+                match = resolve('%s/' % request.path_info, urlconf)
             except Resolver404:
                 pass
             else:
                 if getattr(match.func, 'should_append_slash', True):
-                    return HttpResponsePermanentRedirect(path)
+                    return HttpResponsePermanentRedirect('%s/' % request.path)
         raise Http404
 
     def _build_app_dict(self, request, label=None):

docs/releases/3.2.4.txt

@@ -9,4 +9,6 @@ Django 3.2.4 fixes several bugs in 3.2.3.
 Bugfixes
 ========
 
-* ...
+* Fixed a bug in Django 3.2 where a final catch-all view in the admin didn't
+  respect the server-provided value of ``SCRIPT_NAME`` when redirecting
+  unauthenticated users to the login page (:ticket:`32754`).

tests/admin_views/tests.py

@@ -6599,6 +6599,42 @@ class AdminSiteFinalCatchAllPatternTests(TestCase):
         response = self.client.get(known_url[:-1])
         self.assertRedirects(response, known_url, status_code=301, target_status_code=403)
 
+    @override_settings(APPEND_SLASH=True)
+    def test_missing_slash_append_slash_true_script_name(self):
+        superuser = User.objects.create_user(
+            username='staff',
+            password='secret',
+            email='staff@example.com',
+            is_staff=True,
+        )
+        self.client.force_login(superuser)
+        known_url = reverse('admin:admin_views_article_changelist')
+        response = self.client.get(known_url[:-1], SCRIPT_NAME='/prefix/')
+        self.assertRedirects(
+            response,
+            '/prefix' + known_url,
+            status_code=301,
+            fetch_redirect_response=False,
+        )
+
+    @override_settings(APPEND_SLASH=True, FORCE_SCRIPT_NAME='/prefix/')
+    def test_missing_slash_append_slash_true_force_script_name(self):
+        superuser = User.objects.create_user(
+            username='staff',
+            password='secret',
+            email='staff@example.com',
+            is_staff=True,
+        )
+        self.client.force_login(superuser)
+        known_url = reverse('admin:admin_views_article_changelist')
+        response = self.client.get(known_url[:-1])
+        self.assertRedirects(
+            response,
+            '/prefix' + known_url,
+            status_code=301,
+            fetch_redirect_response=False,
+        )
+
     @override_settings(APPEND_SLASH=True)
     def test_missing_slash_append_slash_true_non_staff_user(self):
         user = User.objects.create_user(