http headers in GRPC python call

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Tejal Singh

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Jul 5, 2022, 5:03:17 AM7/5/22

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I want to know how we can add custom http headers in a grpc call. I am using feast serving service stub for making grpc call (from feast.serving.ServingService_pb2_grpc import ServingServiceStub).

Adrian Gay

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Jul 5, 2022, 6:18:57 AM7/5/22

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headers are passed as gRPC metadata. So, on a stub call, there is an additional argument. A Python binding example:

response = stub.Predict(request, timeout=self.timeout, metadata=metadata)

metadata is a sequence of Tuples. For headers, the Tuple value at index 0 is the HTTP header key and at index 1 is the HTTP header value.

Adrian

Adrian Gay

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Jul 5, 2022, 6:23:28 AM7/5/22

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following on from previous reply, here is an example of metadata viewed in VSCode debugger:

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