302重定向

一：前言

在做项目的时候遇到一个302地址跳转的问题，具体解决方法如下:

苹果底层不允许我们码农进行WIFI的切换，所以考虑使用302重定向来实现，我通过2种方法来实现，NSURLConnetion和NSURLSession

二：NSURLConnetion方法

大概的思路:使用NSURLConnetion类的NSURLConnectionDataDelegate中的代理方法

- (nullable NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(nullable NSURLResponse *)response

都是码农，直接上代码吧

新建一个DEMO项目的话，记得把App Transport Security Settings Allow Arbitrary Loads设置为YES，否则无法请求网络

- (void)viewDidLoad { [super viewDidLoad]; NSURL *url = [NSURL URLWithString:@"http://www.google.com"]; NSMutableURLRequest *quest = [NSMutableURLRequest requestWithURL:url]; quest.HTTPMethod = @"GET"; NSURLConnection *connect = [NSURLConnection connectionWithRequest:quest delegate:self]; [connect start]; } - (nullable NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(nullable NSURLResponse *)response{ NSHTTPURLResponse *urlResponse = (NSHTTPURLResponse *)response; NSLog(@"%ld",urlResponse.statusCode); NSLog(@"%@",urlResponse.allHeaderFields); NSDictionary *dic = urlResponse.allHeaderFields; NSLog(@"%@",dic[@"Location"]); return request; }

request 是你要发送的请求 urlResponse.statusCode 则是请求的状态码,302则是重定向 。urlResponse.allHeaderFields中保存着http的头信息:

{ Connection = close; "Content-Type" = "text/html"; Date = "Mon, 30 May 2016 04:00:49 GMT"; Location = "http://118.244.233.137:6001/login/?gw_address=192.168.17.1&gw_port=2060&gw_id=ctzx_11&ip=192.168.17.24&mac=54:72:4f:30:c6:10&url=http://www.google.com/"; Server = "Hughes Technologies Embedded Server"; }

通过urlResponse.allHeaderFields[@”Location”]即可拿到302跳转的url地址.如果需要拦截掉这个url地址跳转，则可在代理方法中自定义一个request

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task willPerformHTTPRedirection:(NSHTTPURLResponse *)response newRequest:(NSURLRequest *)request completionHandler:(void (^)(NSURLRequest * __nullable))completionHandler{ //block为nil，则直接拦截掉302的url地址，防止自动跳转 completionHandler(nil); }

则直接拦截掉302的url地址，防止自动跳转 completionHandler(nil);}

三：NSURLSession方法

- (void)viewDidLoad { [super viewDidLoad]; NSURL *url = [NSURL URLWithString:@"http://www.google.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; NSLog(@"%ld",urlResponse.statusCode); NSLog(@"%@",urlResponse.allHeaderFields); NSDictionary *dic = urlResponse.allHeaderFields; NSLog(@"%@",dic[@"Location"]); }]; [task resume]; } - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task willPerformHTTPRedirection:(NSHTTPURLResponse *)response newRequest:(NSURLRequest *)request completionHandler:(void (^)(NSURLRequest * __nullable))completionHandler{ completionHandler(nil); }

使用方法和第一种方法一样