如果集群中的任何节点发生故障，那么用户会被重定向到系统中的另一个功能节点，而他或她的会话会继续，就像什么也没发生一样。
If any of the nodes in the cluster were to fail, a user would be redirected to another functional node in the system, and his or her session would continue as if nothing had happened.
功能测试的示例包括测试成功的Web请求、正确的页面重定向、正确的身份验证以及对特定动作的正确响应。
Examples of functional tests include testing for a successful Web request, redirection to the correct page, proper authentication, and the correct responses for specific actions.
这项功能是安全网，允许Seam自由地在任意适当的时候使用重定向。
This feature is the safety net that allows Seam to take great liberty in using redirects whenever appropriate.
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