The classes shown are those used for the getBook call in both the Listing 2 client code and the Listing 3 server code.

显示的类用于 清单 2 的客户机代码和 清单 3 的服务器代码中的 getBook 调用。

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If a Web application is making Ajax calls out of control, it can certainly have more than 2 open connections, especially if the server-side call is time-intensive.

如果Web应用程序不对Ajax调用进行控制，它就很可能打开2个以上的连接，尤其是服务器端调用属于时间密集型调用时。

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