bug #1365984: urllib and data: URLs. Problem was that cStringIO objects cannot be assigned attributes on the fly.
diff --git a/Misc/NEWS b/Misc/NEWS
index de637e1..c087a11 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -287,6 +287,8 @@
 Library
 -------
 
+- Bug #1365984: urllib now opens "data:" URLs again.
+
 - Patch #1314396: prevent deadlock for threading.Thread.join() when an exception
   is raised within the method itself on a previous call (e.g., passing in an
   illegal argument)