页面抓取本质上是HTML页面的反向工程，也可以看成页面解释器，网页以HTML编码，HTML以树型结构表示信息，实际数据与布局代码以及效果信息混杂在一起，不能被计算机直接利用。

It can also be thought of as parsing out chunks of information from a page. Web pages are coded in HTML, which uses a tree-like structure to represent the information.

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特别地，反向代理将在Web客户机与Web服务器之间进行仲裁，以捕捉每个传入HTTP请求及其各自的HTTP响应。

Specifically, a reverse proxy intercedes between Web clients and your Web server to capture each incoming HTTP request and its respective HTTP response.

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在这里，我将把PHP与名为反向代理(reverse proxy)的智能软件结合使用来缓存页面和节省服务器。

Here, I combine PHP with smart software called a reverse proxy to cache pages and save servers.

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