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The only difference between xmlrpclib.py from trunk and 2.5.1 is in the
Marshaller class. Unrelated, as far as I can see.
Note that it seems that the intent of the original code was to support
this x509-dict all along:
$ grep -n x509 xmlrpclib.py.trunk
1224: # Host may be a string, or a (host, x509-dict) tuple; if a string,
1228: # @param host Host descriptor (URL or (URL, x509 info) tuple).
1230: # x509 info). The header and x509 fields may be None.
1234: x509 = {}
1236: host, x509 = host
1251: return host, extra_headers, x509
1262: host, extra_headers, x509 = self.get_host_info(host)
1282: host, extra_headers, x509 = self.get_host_info(host)
1362: # host may be a string, or a (host, x509-dict) tuple
1364: host, extra_headers, x509 = self.get_host_info(host)
1372: return HTTPS(host, None, **(x509 or {}))
Basically just the ServerProxy constructor doesn't support it. One would
have to create a new class with a new constructor just because of it.
That's why I opened this ticket.