def MigrateBackward(self, client, message, callback):
    del message.dict['headers']
    callback()
run the executor until it is stopped externally by the framework
dataset/ETHPy150Open viewfinderco/viewfinder/backend/base/message.py/AddHeadersMigrator.MigrateBackward--crossover with--dataset/ETHPy150Open ceteri/exelixi/src/resource.py/MesosExecutor.run_executor