code: public static <T> Middleware<SyncHandler<T>, AsyncHandler<Response<ByteString>>> htmlSerializeSync(
        final String templateName) {
      Middleware<SyncHandler<T>, AsyncHandler<T>> syncToAsync = Middleware::syncToAsync;
      return syncToAsync.and(htmlSerialize(templateName));
    }
docs: Sync middleware for POJO.
  
  @param templateName The template name, respective to the "resources" folder
  @param <T>          The Type of the parameters
  @return the middlware