Google app engine Appengine清除已过期的会话，但需要管理员权限才能访问https://[domain]/\u ah/sessioncleanup？清除

项目在Appengine中工作，我想清除已过期的会话，请遵循以下文档：

Web.xml

<servlet>
        <servlet-name>_ah_sessioncleanup</servlet-name>
        <servlet-class>com.google.apphosting.utils.servlet.SessionCleanupServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>_ah_sessioncleanup</servlet-name>
        <url-pattern>/_ah/sessioncleanup</url-pattern>
    </servlet-mapping>

    <!-- Default page to serve -->
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>

    <security-constraint>
        <web-resource-collection>
            <web-resource-name>session-clean-up</web-resource-name>
            <url-pattern>/_ah/sessioncleanup</url-pattern>
        </web-resource-collection>
        <auth-constraint>
            <role-name>admin</role-name>
        </auth-constraint>
    </security-constraint>

_A_会话清理
com.google.apphosting.utils.servlet.SessionCleanupServlet
_A_会话清理
/_ah/会话清理
index.html
会议清理
/_ah/会话清理

有人能帮我吗？谢谢

<?xml version="1.0" encoding="UTF-8"?>
<cronentries>
  <cron>
    <url>/_ah/sessioncleanup?clear</url>
    <description>Clean up sessions</description>
    <schedule>every 15 minutes</schedule>
  </cron>
</cronentries>