Https访问

有的时候Https访问我们可以直接拿到数据!!
因为有的公司财大气粗!哥么有钱!!可以认证!!!
认证过的Https访问时强制安装证书的!!
但是很多公司的Https访问你这样是拿不到数据的!!

代码实现

@interface ViewController ()<NSURLSessionTaskDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];   
    NSURLSession * session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
    NSURLSessionDataTask * task = [session dataTaskWithURL:[NSURL URLWithString:@"https://www.apple.com"] completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);
    }];
    [task resume];
}

#pragma mark - <协议>
/**
 参数:
 Challenge :询问,询问客户端是否需要信任来自服务器的证书!
 属性:protectionSpace(受保护的空间)
 Auth-Scheme:NSURLAuthenticationMethodServerTrust  服务器返回的授权模式:要求信任服务器的证书
 completionHandler : 通过代码块回调,决定对证书的处理!!
 
 NSURLSessionAuthChallengeDisposition (处置):
 NSURLSessionAuthChallengeUseCredential                     
        -  使用服务器发回证书(保存在challenge里面)
 NSURLSessionAuthChallengePerformDefaultHandling
        -  默认处理方式,会忽略证书
 NSURLSessionAuthChallengeCancelAuthenticationChallenge
        -  取消整个请求,忽略证书
 NSURLSessionAuthChallengeRejectProtectionSpace
        -  本次拒绝,下次再试
 
 NSURLCredential   证书
 */
-(void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler
{
    //1.判断服务器的身份验证的方法是否是:信任服务器证书
    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
        NSLog(@"哥么是信任的证书");
            //2.获得证书
        NSURLCredential * credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
            //3.对服务器的证书做出"处理"
        completionHandler(NSURLSessionAuthChallengeUseCredential,credential);
    }
 }

@end