... 用户认证失败Failed user authentication 无效请求Invalid request 内部服务器错误Internal server error ...
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倘若一个用户想要通过合法手段提交无效请求，这可以给您一些显示控制。
This gives you some control over presentation in the event that a user manages to submit an invalid request via legitimate means.
例如，如果一个无效的请求值被拷贝到一个组件中，那么当前的视图就会重新显示，而有些阶段就可能不会执行。
For example, if an invalid request value were copied to a component, the current view would be redisplayed, and some of the phases might not execute.
工具箱通过在执行每一个重新排序请求之前对其结果进行验证，防止无效的模型被建立。
The toolset prevents invalid models from being created by validating the results of each reorder request before it is performed.
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