本场景演示了在从后端系统为用户检索数据时，通知用户等待的流畅而友好的方式。
This scenario demonstrates a smooth and friendly way to inform your user to wait while you retrieve data for them from a backend system.
不过，为了进一步演示使用Grails创建Web服务有多么简单，我们将修改现有的后端，并为其添加一个搜索api。
However, to further demonstrate how easy it is to create Web services with Grails, let's modify the existing back end and add a search API to it.
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