Request the Steam Web API status and time.

        format: Return format. None defaults to json. (json, xml, vdf)

def get_server_info(self, format=None):
        """Request the Steam Web API status and time.

        format: Return format. None defaults to json. (json, xml, vdf)

        """
        parameters = {}
        if format is not None:
            parameters['format'] = format
        url = self.create_request_url(self.interface, 'GetServerInfo', 1,
            parameters)
        data = self.retrieve_request(url)
        return self.return_data(data, format=format)