工作中遇到了獲取重定向URL地址的問(wèn)題,網(wǎng)上AFN獲取的文章比較少,所以打算記錄一下.話(huà)不多說(shuō).直接上代碼
Demo地址 (https://github.com/MrPlusZhao/RequestCode302URL.git)

1: NSURLSession 方法 (記得設(shè)置<NSURLSessionTaskDelegate>)

/// 用NSURLSession 獲取重定向URL地址
重點(diǎn)是 willPerformHTTPRedirection 這個(gè)代理方法

- (void)request302
{
    NSURL *url = [NSURL URLWithString:@"https://www.bing.com"];
    NSMutableURLRequest *quest = [NSMutableURLRequest requestWithURL:url];
    quest.HTTPMethod = @"GET";
    NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
    config.requestCachePolicy = NSURLRequestReloadIgnoringLocalCacheData;
    NSURLSession *urlSession = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:[NSOperationQueue currentQueue]];
    NSURLSessionDataTask *task = [urlSession dataTaskWithRequest:quest completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        NSHTTPURLResponse *urlResponse = (NSHTTPURLResponse *)response;
        if (urlResponse.statusCode == 302) {
            // do something ...
            NSLog(@"重定向地址 == %@",urlResponse.allHeaderFields[@"Location"]);
        }
    }];
    [task resume];
}

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task willPerformHTTPRedirection:(NSHTTPURLResponse *)response newRequest:(NSURLRequest *)request completionHandler:(void (^)(NSURLRequest * _Nullable))completionHandler{
    NSLog(@"%ld",response.statusCode); // 302
    NSLog(@"%@",response.allHeaderFields[@"Location"]); // 重定向地址URL
//    completionHandler(nil); 打開(kāi),block會(huì)有回調(diào),不打開(kāi)就沒(méi)有回調(diào),根據(jù)業(yè)務(wù)需求決定
}

2:AFN 獲取重定向URL地址

重點(diǎn)是setTaskWillPerformHTTPRedirectionBlock 方法

/// 用AFN 攔截重定向URL地址
- (void)request302ForAFN
{
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    [manager GET:@"https://www.bing.com" parameters:nil headers:nil progress:^(NSProgress * _Nonnull downloadProgress) {
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        NSLog(@"responseObject = %@",responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"error = %@",error);
    }];
    [manager setTaskWillPerformHTTPRedirectionBlock:^NSURLRequest * _Nullable(NSURLSession * _Nonnull session, NSURLSessionTask * _Nonnull task, NSURLResponse * _Nonnull response, NSURLRequest * _Nonnull request) {
        NSHTTPURLResponse *urlResponse = (NSHTTPURLResponse *)response;
        if (urlResponse.statusCode == 302) {
            // do something ...
            NSLog(@"重定向地址 == %@",urlResponse.allHeaderFields[@"Location"]);
            // https://www.bing.com ---->  http://cn.bing.com
        }
        if (request) {
            return request;
        }else{
            return nil;
        }
    }];
}