Whereas the cache API is designed to cache data for a long period or until some condition is met, per-request caching simply means caching the data for the duration of the request.

缓存api的设计目的是为了将数据缓存较长的一段时间，或者缓存至满足某些条件时，但每请求缓存则意味着只将数据缓存为该请求的持续时间。

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This field is used to specify directives that must be obeyed by all caching mechanisms along the request/response chain.

这个字段用于指定所有缓存机制在整个请求/响应链中必须服从的指令。

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Therefore, if the result of an application request is retrieved from the elastic caching tier, the application processing and processing latency for that request are eliminated.

因此，如果从弹性缓存层检索到应用程序请求的结果，则会清除应用程序处理和此请求的处理延时。

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