code: @Route(method = HttpMethod.POST, uri = "samples/manual-validation")
      public Result check(@Body Car car) throws IOException {
          Set<ConstraintViolation<Car>> violations = validator.validate(car);
          if (!violations.isEmpty()) {
              return badRequest(violations).json();
          } else {
              return ok();
          }
      }
docs: Displays the result (manual check).