try {
            if (bis.read(bytes) == -1) {
                return false;
            }

            final String preloadDate = new String(bytes, Constants.UTF_8);
            if (preloadDate.indexOf("<urlset") >= 0 || preloadDate.indexOf("<sitemapindex") >= 0 || preloadDate.startsWith("http://")
                    || preloadDate.startsWith("https://")) {
                // XML Sitemaps
                return true;
            }

        }
        final Set<RequestData> urlSet = new HashSet<>(docList.size());
        for (final Map<String, Object> doc : docList) {
            final String url = DocumentUtil.getValue(doc, fessConfig.getIndexFieldUrl(), String.class);
            if (StringUtil.isNotBlank(url)) {
                urlSet.add(RequestDataBuilder.newRequestData().get().url(url).build());
            }
        }

            return;
        }

        // add url and filter
        final Set<String> urlSet = new HashSet<>();
        final List<UrlQueue<?>> childList = childUrlList.stream()
                .filter(d -> StringUtil.isNotBlank(d.getUrl()) && urlSet.add(d.getUrl()) && crawlerContext.urlFilter.match(d.getUrl()))
                .map(d -> {

growing, and very soon had to kneel down on the floor:  in
another minute there was not even room for this, and she tried
the effect of lying down with one elbow against the door, and the
other arm curled round her head.  Still she went on growing, and,
as a last resource, she put one arm out of the window, and one
foot up the chimney, and said to herself `Now I can do no more,
whatever happens.  What WILL become of me?'

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