The request cycle goes through several states and, depending on the current state, sends different instructions to the request cycle processor.
请求周期会经历若干状态并会根据当前状态向请求周期处理器发出不同的指令。
The request cycle processor is responsible for handling instructions during the request cycle. It's used by RequestCycle, which calls its methods in the predefined order.
请求周期处理器负责处理请求周期内的指令。
Some objects are intended for only one request cycle; after the request is completed, they are no longer useful.
一些对象只在一个请求的处理周期中存在；请求完成之后，就不再需要这些对象了。
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