docs: private CmsSiteMatcher getRequestMatcher(HttpServletRequest req) {
  
          CmsSiteMatcher matcher = new CmsSiteMatcher(req.getScheme(), req.getServerName(), req.getServerPort());
          // this is required to get the right configured time offset
          int index = m_siteMatchers.indexOf(matcher);
          if (index < 0) {
              return matcher;
          }
          return m_siteMatchers.get(index);
      }