URLSession请求类中实现URLSessionDelegate方法之:urlsession(_session:URL session,task:URL sessiontask,didReceive challenge:URLAuthenticationChallenge,completionHandler:.......){

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URLSession请求类中实现URLSessionDelegate方法之:urlsession(_session:URL session,task:URL sessiontask,didReceive challenge:URLAuthenticationChallenge,completionHandler:.......){