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• 如何使用session發(fā)送HTTPS請(qǐng)求（需使用代理方法）

- (void)session {

    // 1.確定URL
    NSURL *url = [NSURL URLWithString:@"https://www.12306.cn/mormhweb/"];
    
    // 2.設(shè)置請(qǐng)求對(duì)象
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
    // 3.創(chuàng)建會(huì)話對(duì)象
    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
    
    // 4.創(chuàng)建Task
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        
        // 6.解析數(shù)據(jù)
        NSLog(@"-- %@ ------- %@ ---", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding], error);
     }];
    
    // 5.執(zhí)行Task
    [dataTask resume];
}

// 代理協(xié)議
<NSURLSessionDataDelegate>
#pragma mark - NSURLSessionDataDelegate
/**
 // 如果發(fā)送的請(qǐng)求是HTTPS的請(qǐng)求，該方法才會(huì)被調(diào)用
 @param session 會(huì)話對(duì)象
 @param challenge 質(zhì)詢，挑戰(zhàn)
 @param completionHandler 回調(diào)
 */
- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler {
    
    if (![challenge.protectionSpace.authenticationMethod isEqualToString:@"NSURLAuthenticationMethodServerTrust"]) {
        
        return;
    }
    
    NSLog(@"%@", challenge.protectionSpace);
    // NSURLSessionAuthChallengeDisposition 如何處理證書
    /**
    NSURLSessionAuthChallengeUseCredential = 0, 安裝并使用該證書
    NSURLSessionAuthChallengePerformDefaultHandling = 1, 默認(rèn)方式，該證書會(huì)被忽略
    NSURLSessionAuthChallengeCancelAuthenticationChallenge = 2, 取消請(qǐng)求，忽略證書
    NSURLSessionAuthChallengeRejectProtectionSpace = 3, 拒絕
    */
    // NSURLCredential 授權(quán)信息
    NSURLCredential *credential = [[NSURLCredential alloc] initWithTrust:challenge.protectionSpace.serverTrust];
    completionHandler(NSURLSessionAuthChallengeUseCredential, credential);  
}

• 一般在開(kāi)發(fā)中一般會(huì)使用第三方框架處理發(fā)送網(wǎng)絡(luò)數(shù)據(jù)，我們以AFNetworking為例講

- (void)AFN {

    // 01.創(chuàng)建會(huì)話管理對(duì)象
    AFHTTPSessionManager *httpSessionManager = [AFHTTPSessionManager manager];
    
    // +// 更改解析方式
    httpSessionManager.responseSerializer = [AFHTTPResponseSerializer serializer];
    
    // +// 設(shè)置對(duì)證書的處理方式 是否接收無(wú)效證書
    httpSessionManager.securityPolicy.allowInvalidCertificates = YES;
    // +// AFN內(nèi)部默認(rèn)會(huì)對(duì)域名進(jìn)行驗(yàn)證 修改是否對(duì)域名進(jìn)行驗(yàn)證
    httpSessionManager.securityPolicy.validatesDomainName = NO;
    
    // 02.發(fā)送請(qǐng)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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