HTTPS

#import "ViewController.h"

@interface ViewController () 
@end

@implementation ViewController

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


#pragma mark - 
/**
 * challenge : 挑战、质询
 * completionHandler : 通过调用这个block，来告诉 URLSession 要不要接收这个证书
 */
-  (void)URLSession:(NSURLSession *)session
               task:(NSURLSessionTask *)task
didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge
  completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential *))completionHandler{
    
    // 如果不是服务器信任类型的证书，直接返回
    if (![challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) return;
    
    /*
        void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential *)
        NSURLSessionAuthChallengeDisposition : 如何处理这个安全证书
        NSURLCredential : 安全证书
    */
    
    // 根据服务器的信任信息创建证书对象
    NSURLCredential *crdential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];

    // 利用这个block说明使用这个证书
    if (completionHandler) {
        completionHandler(NSURLSessionAuthChallengeUseCredential, crdential);
    }
    
    !completionHandler ? : completionHandler(NSURLSessionAuthChallengeUseCredential, challenge.proposedCredential);
}

@end

就把苹果官方网站的首页抓取下来了

    
        

... ...