&& 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);

        urlList = fessXpathTransformer.convertChildUrlList(urlList);
        assertEquals(2, urlList.size());
        assertEquals("http://www.example.com", urlList.get(0).getUrl());
        assertEquals("http://www.test.com", urlList.get(1).getUrl());

        urlList.clear();
        urlList.add(RequestDataBuilder.newRequestData().get().url("feed://www.example.com").build());

                        prefix + prefix2 + "id",
                        null,
                        "must be unique: " + repository.getId() + " -> " + existing.getUrl() + " vs "
                                + repository.getUrl(),
                        repository);
            } else {
                index.put(key, repository);
            }
        }
    }

        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 {

            return msg.getContent();
        }
        final String refs = sources.stream().map(s -> {
            final String title = s.getTitle();
            final String url = s.getUrl();
            if (title != null && !title.isEmpty() && url != null && !url.isEmpty()) {
                return title + " (" + url + ")";
            } else if (title != null && !title.isEmpty()) {