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Thanks! 
 
It seems .reduce_uri() tries to cope with hostnames as well as 
absoluteURIs.  I don't understand why it wants to do that, but it 
fails, because it doesn't anticipate what urlparse does when a 
port is present: 
 
>>> urlparse.urlparse("foo.bar.com") 
('', '', 'foo.bar.com', '', '', '') 
>>> urlparse.urlparse("foo.bar.com:80") 
('foo.bar.com', '', '80', '', '', '') 
 
I haven't checked, but I assume it's just incorrect use of 
urlparse to pass it a hostname. 
 
Of course, if it's "fixed" to only accept absoluteURIs, it will 
break existing code, so I guess it must be fixed for 
hostnames. :-(( 
 
Also, I think .is_suburi("/foo/spam", "/foo/eggs") should return 
False, but returns True, and .http_error_40x() use 
req.get_host() when they should be using req.get_full_url() 
(from a quick look at RFC 2617).