# 请求，响应，和中间件

我们已经讨论了一些关于Illuminate请求对象的内容。例如在第3章，你看到你可以在构造函数中获取实例或者用request()来检索实例，在第7章我们研究了如何使用它获取用户输入的信息。

在本章中，你将进一步了解请求对象是什么，它是如何生成的，它代表什么，以及它在应用程序生命周期中扮演什么角色。我们还将讨论响应对象和Laravel的中间件模式。


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