@Streaming(true)
        @Produces(MediaTypeNames.OCTET_STREAM)
        @Get("/httpDataOctetPublisher")
        public Publisher<HttpData> httpDataOctetPublisher() {
            return StreamMessage.of(HttpData.ofUtf8("httpDataOctetPublisher"));
        }
A mock service for testing {@link ByteArrayResponseConverterFunction}.
core/src/test/java/com/linecorp/armeria/internal/server/annotation/ResponseStreamingTest.java