对于调用周期内的每个请求、每个响应和每个错误，都将调用这些对象。
These are invoked for every request, every response, and every error during the invocation cycle.
这个响应和请求数据的内部标签的条件是数据相关性。
The term for this internal tagging of response and request data is data correlation.
处理程序是一个处理请求、响应和故障流的对象。
A handler is an object processing request, response, and fault flow.
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