diff -r 4f4369e63f5e -r 6abd6e3599f4 web/httpcache.py
--- a/web/httpcache.py	Mon Apr 12 14:41:01 2010 +0200
+++ b/web/httpcache.py	Tue Apr 13 12:19:24 2010 +0200
@@ -43,6 +43,8 @@
     """
 
     def etag(self):
+        if self.req.cnx is None:
+            return self.view.__regid__
         return self.view.__regid__ + '/' + ','.join(sorted(self.req.user.groups))
 
     def max_age(self):