String attrValue = attrNode.getNodeValue();
                    if (StringUtil.isNotBlank(attrValue)) {
                        // if starting with www, append a protocol
                        if (attrValue.startsWith("www.")) {
                            attrValue = "http://" + attrValue;
                        }
                        return attrValue;
                    }
                }

        }
        return new HashMap<String, Object>();
    }

    @Override
    protected void addChildUrlFromTagAttribute(final List<String> urlList, final URL url, final String attrValue, final String encoding) {
        final String urlValue = attrValue.trim();
        URL childUrl;
        String u = null;
        try {
            childUrl = new URL(url, urlValue.startsWith(":") ? url.getProtocol() + urlValue : urlValue);