="site" th:content="${site.url}">
  <meta name="referrer" th:content="${theme.config.basic_info.referrer_policy}">
  <meta http-equiv="Referrer-Policy" th:content="${theme.config.basic_info.referrer_policy}">
  <meta property="og:type" content="website">
  <meta property="og:title" th:content="${site.title}">
  <meta property="og:url" th:content="${#strings.isEmpty(canonical) ? '' : #strings.startsWith(canonical, 'http') ? canonical : (site.url + canonical).replaceAll('(?<!:)//', '/')}">
  <meta property="o