def value_from_request(self, dispatcher, model, path):

        if(len(path) == 0):
            # just return blobinfo key
            super(BlobReferenceHandler, self).value_from_request(dispatcher,
                                                                 model, path)
            return

        if(path.pop(0) != CONTENT_PATH):
            raise DispatcherException(404)

        dispatcher.upload_blob(path, model, self.property_name)
Writes a single property from the dispatcher's response.
dataset/ETHPy150Open jahlborn/appengine-rest-server/src/main/python/rest/__init__.py/BlobReferenceHandler.value_from_request