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