在客户机和服务器端进行缓存可以在磁盘或内存中进行，这可以根据系统中所生成的负载的类型来决定。
Caching on the client and server side could be on disk or memory, based on the kind of loads generated in the system.
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.
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