private static Set<MediaType> availableMimeTypes(Route route) {
        final ImmutableSet.Builder<MediaType> builder = ImmutableSet.builder();
        final Set<MediaType> consumeTypes = route.consumes();
        builder.addAll(consumeTypes);
        if (!consumeTypes.contains(MediaType.JSON_UTF_8)) {
            builder.add(MediaType.JSON_UTF_8);
        }
        return builder.build();
    }
A {@link DocServicePlugin} implementation that supports the {@link AnnotatedService}.
core/src/main/java/com/linecorp/armeria/internal/server/annotation/AnnotatedDocServicePlugin.java