博文参考
iOS开发之网络层探索
iOS安全策略之HTTPS
AFN头文件信息
#import <Foundation/Foundation.h>
#import <Availability.h>
#import <TargetConditionals.h> //目标文件
#ifndef _AFNETWORKING_
#define _AFNETWORKING_
#import "AFURLRequestSerialization.h" //请求
#import "AFURLResponseSerialization.h" //响应
#import "AFSecurityPolicy.h" //安全策略(关于证书)
#if !TARGET_OS_WATCH
#import "AFNetworkReachabilityManager.h" //网络提醒
#endif
#import "AFURLSessionManager.h" //父类
#import "AFHTTPSessionManager.h" //子类
#endif /* _AFNETWORKING_ */
