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Does HTTP have exceptions? No, it has error codes and error messages. gRPC is a protocol. Implementors can choose to use exceptions or not, but that choice is tangential to the actual protocol.

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That is right. gRPC and Google APIs share one simple error model, as defined by https://github.com/google/googleapis/blob/master/google/rpc/.... The goal is to make it easier for developers to handle errors.

PS: I was the co-author of it.

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