Decode grpc-status-details-bin and add it to GrpcException #2352
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Only attempt to base64-decode it when there's no transport error. An invalid base64 value will be treated as IOException.
It is up to the user to unmarshal it into a string if desired.
This is a de-facto standard used by grpc:
https://groups.google.com/g/grpc-io/c/p_gCk1bn2JE
Note that this is not included into
responseMetadata
because gRPC metadata must not include reserved namesgrpc-*
per spec: https://grpc.io/docs/what-is-grpc/core-concepts/#metadata In other words, by definition this is not "metadata".Fixes #2343.