一旦用户登录成功，便不再想看到它了，所以当它检测到用户已经成功通过验证，它就按照默认设置变为不可见。
Once the user logs in, you don't really want to see it anymore, so by default it disappears when it detects that an authenticated user is already present.
例如，当Dispatcher收到一个请求时，首先执行的一个操作就是验证该请求所属的会话是否已经通过身份验证。
For example, one of the first operations Dispatcher runs when it receives a request is to verify whether the session this request is a part of is already authenticated.
直到用户已经通过身份验证，服务器才向用户显示信息。
The server does not display any information to the user until the user has authenticated.
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