HTTPS请求代码演练

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• 如何使用session发送HTTPS请求（需使用代理方法）

- (void)session {

    // 1.确定URL
    NSURL *url = [NSURL URLWithString:@"https://www.12306.cn/mormhweb/"];
    
    // 2.设置请求对象
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
    // 3.创建会话对象
    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
    
    // 4.创建Task
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        
        // 6.解析数据
        NSLog(@"-- %@ ------- %@ ---", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding], error);
     }];
    
    // 5.执行Task
    [dataTask resume];
}

// 代理协议

#pragma mark - NSURLSessionDataDelegate
/**
 // 如果发送的请求是HTTPS的请求，该方法才会被调用
 @param session 会话对象
 @param challenge 质询，挑战
 @param completionHandler 回调
 */
- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler {
    
    if (![challenge.protectionSpace.authenticationMethod isEqualToString:@"NSURLAuthenticationMethodServerTrust"]) {
        
        return;
    }
    
    NSLog(@"%@", challenge.protectionSpace);
    // NSURLSessionAuthChallengeDisposition 如何处理证书
    /**
    NSURLSessionAuthChallengeUseCredential = 0, 安装并使用该证书
    NSURLSessionAuthChallengePerformDefaultHandling = 1, 默认方式，该证书会被忽略
    NSURLSessionAuthChallengeCancelAuthenticationChallenge = 2, 取消请求，忽略证书
    NSURLSessionAuthChallengeRejectProtectionSpace = 3, 拒绝
    */
    // NSURLCredential 授权信息
    NSURLCredential *credential = [[NSURLCredential alloc] initWithTrust:challenge.protectionSpace.serverTrust];
    completionHandler(NSURLSessionAuthChallengeUseCredential, credential);  
}

• 一般在开发中一般会使用第三方框架处理发送网络数据，我们以AFNetworking为例讲

- (void)AFN {

    // 01.创建会话管理对象
    AFHTTPSessionManager *httpSessionManager = [AFHTTPSessionManager manager];
    
    // +// 更改解析方式
    httpSessionManager.responseSerializer = [AFHTTPResponseSerializer serializer];
    
    // +// 设置对证书的处理方式 是否接收无效证书
    httpSessionManager.securityPolicy.allowInvalidCertificates = YES;
    // +// AFN内部默认会对域名进行验证 修改是否对域名进行验证
    httpSessionManager.securityPolicy.validatesDomainName = NO;
    
    // 02.发送请求
    [httpSessionManager GET:@"https://www.12306.cn/mormhweb/" parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        
        NSLog(@"-- %@ ---", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        
        NSLog(@"-- %@ ---", error);
    }];
}

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