logger.warn("Could not parse anchor tags.", e);
        }

        final Set<String> urlSet = new LinkedHashSet<>(anchorList.size());
        for (final RequestData requestData : anchorList) {
            urlSet.add(requestData.getUrl());
        }
        return new ArrayList<>(urlSet);
    }

    /**
     * Gets the base URL for resolving relative URLs.
     *