&& isValidCanonicalUrl(responseData.getUrl(), canonicalUrl)) {
            final Set<RequestData> childUrlSet = new HashSet<>();
            childUrlSet.add(RequestDataBuilder.newRequestData().get().url(canonicalUrl).build());
            logger.info("Canonical URL redirect: from={}, to={}", responseData.getUrl(), canonicalUrl);

        String charset = responseData.getCharSet();
        if (charset == null) {
            charset = Constants.UTF_8;
        }
        final String name;
        final String url = responseData.getUrl();
        final int pos = url.lastIndexOf('/');
        try {
            if (pos >= 0 && pos + 1 < url.length()) {
                name = URLDecoder.decode(url.substring(pos + 1), charset);
            } else {