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if not (backing_server is None or
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isinstance(backing_server, test_server.LocalURLServer)):
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443
self._original_vendor = ssh._ssh_vendor_manager._cached_ssh_vendor
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ssh._ssh_vendor_manager._cached_ssh_vendor = self._vendor
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if sys.platform == 'win32':
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# Win32 needs to use the UNICODE api
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self._homedir = os.getcwdu()