Apply patch #1492147 from Mike Foord.
diff --git a/Doc/howto/urllib2.rst b/Doc/howto/urllib2.rst
index 4cba6e9..06c81d5 100644
--- a/Doc/howto/urllib2.rst
+++ b/Doc/howto/urllib2.rst
@@ -453,7 +453,7 @@
To illustrate creating and installing a handler we will use the
``HTTPBasicAuthHandler``. For a more detailed discussion of this
subject - including an explanation of how Basic Authentication works -
-see the `Basic Authentication Tutorial`_.
+see the `Basic Authentication Tutorial <http://www.voidspace.org.uk/python/articles/authentication.shtml>`_.
When authentication is required, the server sends a header (as well as
the 401 error code) requesting authentication. This specifies the