@Post("/node/node")
    public JsonNode json1(@RequestObject JsonNode input) {
        final JsonNode name = input.get("name");
        return mapper.valueToTree(new Response(Response.SUCCESS, name.textValue()));
    }
Returns a {@link JsonNode} which is converted from a {@link Response} object. The {@link JsonNode}
will be converted as JSON string by the {@link JacksonResponseConverterFunction}.
examples/annotated-http-service/src/main/java/example/armeria/server/annotated/MessageConverterService.java