While you probably want to know which pages are requested by users, you might also want to understand the relationships among requests.
在您可能希望知道用户请求哪些页面的同时，您可能还希望了解请求之间的关系。
You should take care to throw exceptions in these situations, so the user will know that the action could not be performed exactly as they requested.
在这些情况下，您应该负责抛出异常，让用户知道他们请求的操作无法按照期望执行。
We don't know you, we don't have any friends in common, in fact, we think you might have requested our friendship by mistake.
我们没有共同的好友，你很可能是一不小心才添加的我们。
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