static UnframedGrpcErrorHandler ofJson() {
        return JsonUnframedGrpcErrorHandler.of();
    }
Returns a JSON response based on Google APIs.
See <a href="https://cloud.google.com/apis/design/errors#error_model">Google error model</a>
for more information.
grpc/src/main/java/com/linecorp/armeria/server/grpc/UnframedGrpcErrorHandler.java