When using NSURLSession's dataTaskWithRequest how can total response time be measured in the event that many NSURLSessionDataTask are created and will not necessarily be executed immediately? Storing a starting time and calculating the difference within the block doesn't account for time that a task may have been waiting for an available thread. IE:When using NSURLSession's dataTaskWithRequest h
阅读背景：
测量NSURLSession的dataTaskWithRequest的总响应时间
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