code: public void setUrlMapper(QuerySpecUrlMapper urlMapper) {
          checkNotConfiguredYet();
          PreconditionUtil.verify(urlMapper != null, "urlMapper parameter must not be null");
          moduleRegistry.setUrlMapper(urlMapper);
      }
docs: Set the {@link QuerySpecUrlMapper} to use to parse and handle query parameters.
  When invoked, overwrites previous QuerySpecDeserializers.