Alexander Belopolsky <belopol...@users.sourceforge.net> added the comment:

Apparently, the failure on OSX is due to the fact that 
urllib.proxy_bypass('localhost') returns True.  This makes the opener to bypass 
the ProxyHandler that is explicitly set up to use the correct server port:

    def setUp(self):
        ..
        proxy_url = "http://127.0.0.1:%d"; % self.server.port
        handler = urllib2.ProxyHandler({"http" : proxy_url})
        self.proxy_digest_handler = urllib2.ProxyDigestAuthHandler()
        self.opener = urllib2.build_opener(handler, self.proxy_digest_handler)

instead, the opener skips to the default HTTPHandler which attempts to connect 
on port 80 with sad results.

Interestingly,

>>> urllib.proxy_bypass('127.0.0.1')
False

So the simplest fix is s/localhost/127.0.0.1/ as done in the attached patch 
(issue8455.diff).

----------
keywords: +patch
nosy: +belopolsky
Added file: http://bugs.python.org/file17737/issue8455.diff

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