docs: private static Optional<String> getMethodReturnValueName(ConstraintViolation<?> violation) {
          int returnValueNames = -1;
  
          final StringBuilder result = new StringBuilder("server response");
          for (Path.Node node : violation.getPropertyPath()) {
              if (node.getKind().equals(ElementKind.RETURN_VALUE)) {
                  returnValueNames = 0;
              } else if (returnValueNames >= 0) {
                  result.append(returnValueNames++ == 0 ? " " : ".").append(node);
              }
          }
  
          return returnValueNames >= 0 ? Optional.of(result.toString()) : Optional.empty();
      }