gRPC uses the status package to handle errors. It provides a way for RPCs to return detailed error information alongside standard HTTP response codes. The Status object includes an error code and message, plus optional details. Error codes are categorized into 3: OK (no error), gRPC-defined non-OK codes (predefined set of error conditions), application-specific error codes.
To handle these errors, client-side applications should check whether the returned status is OK, if not, handle or propagate it accordingly. For server-side, when an error occurs, it can use status.New(code, msg) to create a status with an error code and message, then return it to the client.
In addition, gRPC supports rich error model where you can attach additional error information in the form of protobuf messages by using the WithDetails method on a Status. This allows more context about the error to be returned, aiding debugging efforts.
