关于AFHTTPRequestOperationManager跟AFURLSessionManager的区别
AFNetworking的作者kylef在回答这个问题时如此说道:AFHTTPRequestOperationManagerusesNSOperation’sunderthehood,anditusestheolderNSURLConnectionAPIfromApple.ItworksoniOS6andonwards.AFURLSessionManagermakesuseofthenewerNS