輸出錯誤信息

在error頁面加以下代碼，之後檢查網頁源代碼就會出現錯誤信息
(URL,Exception是後臺傳過來的參數)
<div>
  <div th:utext="'&lt;!--'" th:remove="tag"></div>
  <div th:utext="'Failed Request URL : ' + ${url}" th:remove="tag"></div>
  <div th:utext="'Exception message : ' + ${exception.message}" th:remove="tag"></div>
  <ul th:remove="tag">
    <li th:each="st : ${exception.stackTrace}" th:remove="tag"><span th:utext="${st}" th:remove="tag"></span></li>
  </ul>
  <div th:utext="'--&gt;'" th:remove="tag"></div>
</div>