Index: Lib/test/test_urllib2_localnet.py
===================================================================
--- Lib/test/test_urllib2_localnet.py	(revision 82145)
+++ Lib/test/test_urllib2_localnet.py	(working copy)
@@ -229,7 +229,7 @@
 
 
 class ProxyAuthTests(BaseTestCase):
-    URL = "http://localhost"
+    URL = "http://127.0.0.1"
 
     USER = "tester"
     PASSWD = "test123"