def _pre_message_hook(self, f):
        f.write('\001\001\001\001' + os.linesep)
This is a callback method used to fetch a response.
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/MMDF._pre_message_hook--crossover with--dataset/ETHPy150Open ganeti/ganeti/lib/rapi/testutils.py/_RapiMock.FetchResponse