一：前言
公司在做項(xiàng)目的時(shí)候遇到一個(gè)302地址跳轉(zhuǎn)的問(wèn)題，具體需求如下:
1、在APP需要更新時(shí)會(huì)有一個(gè)downloadURL，用戶點(diǎn)擊更新時(shí)，downloadURL自動(dòng)連接到另外一個(gè)URL進(jìn)行下載更新
2、公司考慮使用302重定向來(lái)實(shí)現(xiàn)，我通過(guò)2種方法來(lái)實(shí)現(xiàn)，NSURLConnetion和NSURLSession
二：NSURLConnetion方法
大概的思路:使用NSURLConnetion類(lèi)的NSURLConnectionDataDelegate中的代理方法
- (nullable NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(nullable NSURLResponse *)response
都是碼農(nóng)，直接上代碼吧
新建一個(gè)DEMO項(xiàng)目的話，記得把App Transport Security Settings Allow Arbitrary Loads設(shè)置為YES，否則無(wú)法請(qǐng)求網(wǎng)絡(luò)
- (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 是你要發(fā)送的請(qǐng)求 urlResponse.statusCode 則是請(qǐng)求的狀態(tài)碼,302則是重定向 。urlResponse.allHeaderFields中保存著http的頭信息:
{
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";
}
通過(guò)urlResponse.allHeaderFields[@"Location"]即可拿到302跳轉(zhuǎn)的url地址.如果需要攔截掉這個(gè)url地址跳轉(zhuǎn)，則可在代理方法中自定義一個(gè)request
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
willPerformHTTPRedirection:(NSHTTPURLResponse *)response
newRequest:(NSURLRequest *)request
completionHandler:(void (^)(NSURLRequest * __nullable))completionHandler{
//block為nil，則直接攔截掉302的url地址，防止自動(dòng)跳轉(zhuǎn)
completionHandler(nil);
}
- 則直接攔截掉302的url地址，防止自動(dòng)跳轉(zhuǎn) 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);
}
使用方法和第一種方法一樣
