如果可以在浏览器缓存中找到有效的响应，浏览器将不向网络发送请求，而直接将此内容向最终用户显示。
If a valid response can be found in the browser cache, the browser displays the content to the end user without sending a request to the network.
清单5显示了一种典型的缓存清理器。
当然，Network Deployment 应用程序服务器的缓存要比图 3 显示的复杂得多，例如缓存可能分布在集群中的多个应用程序服务器上。
Of course, the Network Deployment application server cache is much more sophisticated than this diagram shows; for example, the cache can be distributed to multiple application servers in a cluster.
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