code: public void init(FilterConfig filterConfig) throws ServletException {
      super.init(filterConfig);
  
      String dirBrowse = filterConfig.getInitParameter("directoryBrowsingDisallowed");
  
      if (dirBrowse != null) {
        dirBrowse = dirBrowse.toLowerCase();
  
        directoryBrowsingDisallowed = dirBrowse.equals("yes") ||
                                      dirBrowse.equals("true");
      }
    }
docs: /* (non-Javadoc)
  @see javax.servlet.Filter#init(javax.servlet.FilterConfig)