def get_data_type(self):
        return blobstore.BlobKey
connect to harvest and get data, set the current state and save the config
dataset/ETHPy150Open jahlborn/appengine-rest-server/src/main/python/rest/__init__.py/BlobReferenceHandler.get_data_type--crossover with--dataset/ETHPy150Open lionheart/TimeTracker-Linux/libs/Logic.py/uiLogic.connect_to_harvest