@Override
        public void errorWithMessage(SimpleRequest request, StreamObserver<SimpleResponse> responseObserver) {
            responseObserver.onError(buildExceptionWithMeta());
        }
Must be at least {@link #unaryPayloadLength()}, plus some to account for encoding overhead.
grpc/src/test/java/com/linecorp/armeria/client/grpc/GrpcClientTest.java