homepage

From urllib.parse:
 uses_relative = ['ftp', 'http', 'gopher', 'nntp', 'imap',
 'wais', 'file', 'https', 'shttp', 'mms',
 'prospero', 'rtsp', 'rtspu', '', 'sftp',
 'svn', 'svn+ssh']
From urllib.parse.urljoin (scheme='redis' and url='/1' in your example): 
 
 if scheme != bscheme or scheme not in uses_relative:
 return _coerce_result(url)
Should the 'redis' scheme be added to uses_relative, perhaps?