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