&& isValidCanonicalUrl(responseData.getUrl(), canonicalUrl)) {
            final Set<RequestData> childUrlSet = new HashSet<>();
            childUrlSet.add(RequestDataBuilder.newRequestData().get().url(canonicalUrl).build());
            logger.info("CANONICAL: {} -> {}", responseData.getUrl(), canonicalUrl);
            throw new ChildUrlsException(childUrlSet, this.getClass().getName() + "#putAdditionalData");

        final StreamResponse response = new StreamResponse(StringUtil.EMPTY);
        final ResponseData responseData = client.execute(RequestDataBuilder.newRequestData().get().url(url).build());
        if (responseData.getHttpStatusCode() == 404) {
            response.httpStatus(responseData.getHttpStatusCode());
            CloseableUtil.closeQuietly(responseData);