def add_header(self, name, value, replace=False):
        if not replace:
            self.headers[name] = value
        else:
            self.headers.replace(name, value)
Creates gRPC stub to make requests to the Operations API.
dataset/ETHPy150Open Lukasa/hyper/hyper/http20/stream.py/Stream.add_header--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/gcloud-python/gcloud/bigtable/client.py/Client._make_operations_stub