John, Thanks again for your help! I think that the do_open function in AbstractHTTPHandler does not return the correct object type as required by the opener. When I include the code you recommended, the implementation comes back with the message, "urlopen error unknown url type: http". Strange, because I would think that overriding the "http_open" function in the handler would have signaled that this function is capable of handling http. If I call the HTTPHandler base class "http_open" function from within the derived class, all works okay, but of course, I don't get to use the source IP address I wanted to use. I'll keep trying and let you know what I find. -Dan
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