@Override
 public void extract(MetadataTarget target, CachedUrl cu, Emitter emitter) throws IOException {
   ArticleMetadata am = new SimpleHtmlMetaTagMetadataExtractor().extract(target, cu);
   am.cook(tagMap);
   String url = am.get(MetadataField.FIELD_ACCESS_URL);
   ArchivalUnit au = cu.getArchivalUnit();
   if (url == null || url.isEmpty() || !au.makeCachedUrl(url).hasContent()) {
     url = cu.getUrl();
   }
   am.replace(
       MetadataField.FIELD_ACCESS_URL,
       HttpToHttpsUtil.AuUtil.normalizeHttpHttpsFromBaseUrl(au, url));
   emitter.emitMetadata(cu, am);
 }