例如，假定客户机想要检索服务器上的订单列表。
For example, assume the client wants to retrieve a list of orders from the server.
有时候这仅仅是某种类型的会话id，它可以用来从内存或数据库检索服务器端状态。
Sometimes this may just be a session id of some sort that can be used to retrieve server-side state from memory or a database.
这个请求检索可以从服务器缓存的主题信息。
This request retrieves theme information that can be cached from the server.
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