必须识别请求和回复停机的代理。
It must identify the requests and replies as non-cacheable by a proxy.
随后,使用第二条case语句来识别请求的路径。
Then, a second case statement is used to identify the path of the request.
最初,这个头主要是用来识别请求意图——后台所调用的操作。
Originally, the purpose of this header was to identify the intent of the request — the operation to be invoked on the back end.
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