On a URL request where the server returns a URL with spaces in, 
urllib doesn't correct it before requesting the new page.

I think this is technically a server error, however, it does work 
from web browsers (Mozilla, Safari) but not from Python urllib.

I would suggest that when urllib is following "moved temporarily" 
links (or similar) from a server it translates spaces to %20.

See example program file for more including detailed server/client 
transactions text.