Comment 5 for bug 1309092

read this discussion http://bugs.python.org/issue18828

From urllib.parse:

    uses_relative = ['ftp', 'http', 'gopher', 'nntp', 'imap',
                     'wais', 'file', 'https', 'shttp', 'mms',
                     'prospero', 'rtsp', 'rtspu', '', 'sftp',
                     'svn', 'svn+ssh']

too append the barttp as an valid schema, we should append it to parse.uses_relative, since keystone is out of the scope and it is no reason to hack source code for test code which just add an uncommon schema, I think we should modify our test code