code: static List<RequestObjectResolver> toRequestObjectResolvers(
              List<RequestConverterFunction> converters) {
          final ImmutableList.Builder<RequestObjectResolver> builder = ImmutableList.builder();
          // Wrap every converters received from a user with a default object resolver.
          converters.stream().map(RequestObjectResolver::of).forEach(builder::add);
          builder.addAll(defaultRequestConverters);
          return builder.build();
      }
docs: Returns a list of {@link RequestObjectResolver} that default request converters are added.