您还会了解到几个Web技巧，例如如何使用过滤器和浏览器ID cookies。

You'll also learn several Web techniques, such as using filters and browser ID cookies.

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第2部分还提供了一个servlet过滤器BrowserIdFilter，用于识别跨浏览器会话的匿名用户。

Part 2 also presents a servlet filter named BrowserIdFilter, which is used to identify anonymous users across browser sessions.

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这么做只会带来更大的麻烦（更确切地说，是更多的麻烦），比如多浏览器支持、数据封送处理、并发冲突、服务器负载以及定制 servlet 和 servlet 过滤器。

Doing so is simply a big headache -- or multiple headaches, rather, with names like multibrowser support, data marshaling, concurrency violation, server load, and custom servlets and servlet filters.

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