iOS中基于HTTPS协议的安全网络请求实现

-(void)session
{
 //1.确定请求路径
    NSString *urlStr = @"https://kyfw.12306.cn/otn/";
 NSURL *url= [NSURL URLWithString:urlStr];
 //2.创建请求对象
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
 //3.创建session
    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];

 NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
 //5.解析数据
        NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);
 }];
 //4.执行task
 [dataTask resume];
}
#pragma mark - NSURLSessionDataDelegate
//只要请求的地址是HTTPS的, 就会调用这个代理方法
//challenge:质询
//NSURLAuthenticationMethodServerTrust:服务器信任
-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler
{
 NSLog(@"%@",challenge.protectionSpace);

 if (![challenge.protectionSpace.authenticationMethod isEqualToString:@"NSURLAuthenticationMethodServerTrust"]) return;
 /*
 NSURLSessionAuthChallengeUseCredential 使用证书
 NSURLSessionAuthChallengePerformDefaultHandling 忽略证书 默认的做法
 NSURLSessionAuthChallengeCancelAuthenticationChallenge 取消请求,忽略证书
 NSURLSessionAuthChallengeRejectProtectionSpace 拒绝,忽略证书
 */

 NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];

 completionHandler(NSURLSessionAuthChallengeUseCredential,credential);
}

-(void)afn
{
 //1.确定请求路径
    NSString *urlStr = @"https://kyfw.12306.cn/otn/";
 NSURL *url= [NSURL URLWithString:urlStr];
 //2.创建请求对象
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
 //3.创建会话管理者
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
 manager.responseSerializer = [AFHTTPResponseSerializer serializer];

 //是否接受无效的证书
    manager.securityPolicy.allowInvalidCertificates= YES;
 //是否匹配域名
    manager.securityPolicy.validatesDomainName = NO;

 NSURLSessionDataTask *dataTask = [manager dataTaskWithRequest:request completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {

 NSLog(@"%@",[[NSString alloc]initWithData:responseObject encoding:NSUTF8StringEncoding]);
 }];
 //4.执行任务
 [dataTask resume];
}