docs: private ResponseUpdater findResponseUpdater(final HttpRequest request) throws HttpException {
          ResponseUpdater updater = this.responseUpdaterSet.stream()
              .filter(ru -> ru.matches(request))
              .findFirst().get();
          if (updater == null) {
              throw new HttpException("cannot find correpsonding response updater");
          } else {
              return updater;
          }
      }