static JsonUnframedGrpcErrorHandler of(UnframedGrpcStatusMappingFunction statusMappingFunction,
                                           MessageMarshaller jsonMarshaller) {
        if (DEFAULT_STATUS_MAPPING_FUNCTION == statusMappingFunction &&
            ERROR_DETAILS_MARSHALLER == jsonMarshaller) {
            return DEFAULT;
        }
        return new JsonUnframedGrpcErrorHandler(statusMappingFunction, jsonMarshaller);
    }
Error handler which maps a gRPC response to an {@link HttpResponse} in json format.
grpc/src/main/java/com/linecorp/armeria/server/grpc/JsonUnframedGrpcErrorHandler.java