How to send custom header (metadata) with Python gRPC?

user_1382297 0
Viewed 14490

I want to know how to send custom header (or metadata) using Python gRPC. I looked into documents and I couldn't find anything.

grpc python
3 Answers

Pls read the example in github. For example:

        response, call = stub.SayHello.with_call(
            helloworld_pb2.HelloRequest(name='you'),
            metadata=(
                ('initial-metadata-1', 'The value should be str'),
                ('binary-metadata-bin',
                 b'With -bin surffix, the value can be bytes'),
                ('accesstoken', 'gRPC Python is great'),
            ))

Or if you want to define a interceptor

        metadata = []
        if client_call_details.metadata is not None:
            metadata = list(client_call_details.metadata)
        metadata.append((
            header,
            value,
        ))
        client_call_details = _ClientCallDetails(
            client_call_details.method, client_call_details.timeout, metadata,
            client_call_details.credentials)

Something important is that the metadata's key can not has upper case character (It has troubled me for a long time).

user_108209620

If you metadata has one key/value you can only use list(eg: [(key, value)]) ,If you metadata has Mult k/v you should use list(eg: [(key1, value1), (key2,value2)]) or tuple(eg: ((key1, value1), (key2,value2))

user_131384890
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