docs: public <T> T getChildEntry(Class<?> parentClass, String parentId,
                                 Class<T> classs, String childId, NameValuePair... params) throws RedmineException {
          final EntityConfig<T> config = getConfig(classs);
          final URI uri = getURIConfigurator().getChildIdURI(parentClass, parentId, classs, childId, params);
          HttpGet http = new HttpGet(uri);
          String response = send(http);
  
          return parseResponse(response, config.singleObjectName, config.parser);
      }