docs: public void postComment(int id, int rating, String comment) {
          ClientResource resource = new ClientResource(Route.ADD_COMMENT.url(id));
          resource.setChallengeResponse(this.auth.toChallenge());
  
          Form form = new Form();
          if (id > 0)
              form.add("rating", String.valueOf(rating));
          if (comment != null && comment.length() > 0)
              form.add("comment", comment);
  
          resource.post(form);
      }