iOS 拦截重定向302跳转的方法

一：前言

公司在做项目的时候遇到一个302地址跳转的问题，具体需求如下:

1、在APP需要更新时会有一个downloadURL，用户点击更新时，downloadURL自动连接到另外一个URL进行下载更新

2、公司考虑使用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%3A%2F%2Fwww.google.com%2F";

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

iOS 拦截重定向302跳转的方法

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