}

        @Override
        public Iterator<String> getPrefixes(final String val) {
            return null; // not used
        }

        @Override
        public String getPrefix(final String uri) {
            return null; // not used
        }
    }

                try (final DeferredFileOutputStream dfos = DeferredFileOutputStream.builder()
                        .setThreshold((int) maxCachedContentSize)
                        .setPrefix("crawler-HcHttpClient-")
                        .setSuffix(".out")
                        .setDirectory(SystemUtils.getJavaIoTmpDir())
                        .get()) {