def handler(self):
        """returns the handler"""
        if self._handler is None:
            self._handler = self.HTTPSClientAuthHandler(key=self._keyfile,
                                                        cert=self._certificatefile)
        return self._handler
def handler ( self ) : if self . _handler is None : self . _handler = self . HTTPSClientAuthHandler ( key = self . _keyfile , cert = self . _certificatefile ) return self . _handler
returns the handler