大部分最新的浏览器已能提前检查你浏览的每个网页，如果网站疑似有恶意软件，浏览器就会提示你。
Most modern browsers pre-check each web page you visit and alert you if one is suspected of being malicious.
如果他们通知你网页已经被删除，你可以通过使用Live HTTP Headers这个Firefox浏览器插件检查网页返回状态。
If they inform you that the page has been removed, you can confirm this by using an HTTP response testing tool like the Live HTTP Headers add-on for the Firefox browser.
高速缓存服务器检查该网页是否能被高速缓存，然后将数据检索到本地高速缓存中，同时将这些内容传递给客户机。
The cache server checks to see if the page can be cached, retrieves the data to cache locally, and, at the same time, passes through the contents to the client.
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