Ticket #6892: 6892v2.diff

views/generic/simple.py

@@ -33 +33 @@
     If the given url is ``None``, a HttpResponseGone (410) will be issued.
     """
     if url is not None:
-        return HttpResponsePermanentRedirect(url % kwargs)
+        try:
+                return HttpResponsePermanentRedirect(url % kwargs)
+        except ValueError:
+                raise ValueError('URL formatting failed in django.views.simple.redirect_to. This can result from the url parameters containing any %-encoded characters. To solve it, replace all "%" with "%%".')
+                
     else:
         return HttpResponseGone()