def at_pre_cmd(self):
        pass
Get a specific header, as from a dictionary.
dataset/ETHPy150Open evennia/evennia/evennia/commands/default/muxcommand.py/MuxCommand.at_pre_cmd--crossover with--dataset/ETHPy150Open ofermend/medicare-demo/socialite/jython/Lib/rfc822.py/Message.__getitem__