private static ManagerUrlLoader get() {
        if (instance != null) {
            return instance;
        }
        synchronized (ManagerUrlLoader.class) {
            String loaderType = CommonPropertiesHolder
                    .getString(KEY_MANAGER_URL_LOADER_TYPE, CommonPropertiesManagerUrlLoader.class.getName());
            LOG.info("Start to load ManagerUrlLoader, type is {}.", loaderType);
            try {
                Class<?> handlerClass = ClassUtils.getClass(loaderType);
                Object handlerObj = handlerClass.getDeclaredConstructor().newInstance();
                if (handlerObj instanceof ManagerUrlLoader) {
                    instance = (ManagerUrlLoader) handlerObj;
                }
            } catch (Throwable t) {
                LOG.error("Got exception when load ManagerAddrGetHandler, type is {}, err is {}",
                        loaderType, t.getMessage());
            }
            Optional.ofNullable(instance).ifPresent(inst -> inst.configure(new Context(CommonPropertiesHolder.get())));
        }
        return instance;
    }
Get URL where Sort-Standalone request SortClusterConfig.

@return URL to get SortClusterConfig.
inlong-sort-standalone/sort-standalone-common/src/main/java/org/apache/inlong/sort/standalone/config/holder/ManagerUrlHandler.java