当你访问一个网站时，NSURLRequest都会帮你主动记录下来你访问的站点设置的Cookie，如果 Cookie 存在的话，会把这些信息放在 NSHTTPCookieStorage 容器中共享，当你下次再访问这个站点时，NSURLRequest会拿着上次保存下来了的Cookie继续去请求。
同样适用于ASIHTTPRequest,AFNetworking, Webview等,Cookie常用于一些基于认证的网络请求
认识下NSHTTPCookieStorage
NSHTTPCookieStorage 实现了一个管理cookie的单例对象(只有一个实例)，每个Cookie都是NSHTTPCookie类的实例，作为为一个规则，Cookie在（macOS）所有应用之间共享并在不同进程之间保持同步，在iOS中不会多应用共享。Session Cookie(一个isSessionOnly方法返回YES的Cookie)只能在单一进程中使用。
Cookie
Cookie是由服务器端生成，发送给User-Agent（一般是浏览器或者客户端），浏览器会将Cookie的key/value保存到某个目录下的文本文件内，下次请求同一网站地址时就发送该Cookie给服务器
HTTP header
HTTP header中包含HTTP请求与响应的操作参数. header属性定义了所传输数据的各种特性. header属性以属性名开始,以冒号结尾,最后是属性值.属性名及值会因应用的不同
一.iOS htttp网络请求Cookie的读取与写入:
Cookie必然会通过HTTP的Respone传过来，并且Cookie在Respone中的HTTP header中。不管是什么请求框架，必然会存在Respone对象，比如AFNetworking2.x的operation.response，AFNetworking3.x的task.response等等。。。。
1.原生NSURLConnection写法
一.获取cookie
- (IBAction)cookieTouched:(id)sender {
NSURL *url = [NSURL URLWithString:@"http://api.skyfox.org/api-test.php"];
NSURLRequest *request = [NSURLRequest requestWithURL:url]
cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData
timeoutInterval:3];
NSOperationQueue *queue = [[NSOperationQueue alloc]init];
[NSURLConnection sendAsynchronousRequest:request
queue:queue
completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){
//转换NSURLResponse成为HTTPResponse
NSHTTPURLResponse *HTTPResponse = (NSHTTPURLResponse *)response;
//获取headerfields
NSDictionary *fields = [HTTPResponse allHeaderFields];//原生NSURLConnection写法
// NSDictionary *fields = [operation.response allHeaderFields]; //afnetworking写法
NSLog(@"fields = %@",[fields description]);
//获取cookie方法1
// NSArray *cookies = [NSHTTPCookie cookiesWithResponseHeaderFields:fields forURL:url];
//获取cookie方法2
//NSString *cookieString = [[HTTPResponse allHeaderFields] valueForKey:@"Set-Cookie"];
//获取cookie方法3
NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (NSHTTPCookie *cookie in [cookieJar cookies]) {
NSLog(@"cookie%@", cookie);
}
}];
}
2.AFNetworking 写法
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.responseSerializer = [AFCompoundResponseSerializer serializer];
//demo中的api返回的是html数据，不是json
[manager POST:@"http://dev.skyfox.org/cookie.php" parameters:nil progress:^(NSProgress * _Nonnull uploadProgress) {
} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
NSLog(@"\n======================================\n");
NSDictionary *fields = ((NSHTTPURLResponse*)task.response).allHeaderFields;
NSLog(@"fields = %@",[fields description]);
NSURL *url = [NSURL URLWithString:@"http://dev.skyfox.org/cookie.php"];
NSLog(@"\n======================================\n");
//获取cookie方法1
NSArray *cookies = [NSHTTPCookie cookiesWithResponseHeaderFields:fields forURL:url];
for (NSHTTPCookie *cookie in cookies) {
NSLog(@"cookie,name:= %@,valuie = %@",cookie.name,cookie.value);
}
NSLog(@"\n======================================\n");
// //获取cookie方法2
// NSString *cookies2 = [((NSHTTPURLResponse*)task.response) valueForKey:@"Set-Cookie"];
// NSLog(@"cookies2 = %@",[cookies2 description]);
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
}];
二.清空Cookie
NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
NSArray *cookieArray = [NSArray arrayWithArray:[cookieJar cookies]];
for (NSHTTPCookie *obj in cookieArray) {
[cookieJar deleteCookie:obj];
}
三.手动设置Cookie 手动设置的Cookie不会自动持久化到沙盒
第一次请求手动设置个cookie
-(void)test1:(NSString*)urlString{
NSURL *url = [NSURL URLWithString:@"http://dev.skyfox.org/cookie.php"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];
[cookieProperties setObject:@"username" forKey:NSHTTPCookieName];
[cookieProperties setObject:@"my ios cookie" forKey:NSHTTPCookieValue];
[cookieProperties setObject:@"dev.skyfox.org" forKey:NSHTTPCookieDomain];
[cookieProperties setObject:@"dev.skyfox.org" forKey:NSHTTPCookieOriginURL];
[cookieProperties setObject:@"/" forKey:NSHTTPCookiePath];
[cookieProperties setObject:@"0" forKey:NSHTTPCookieVersion];
[cookieProperties setObject:[NSDate dateWithTimeIntervalSinceNow:60*60] forKey:NSHTTPCookieExpires];//设置失效时间
[cookieProperties setObject:@"0" forKey:NSHTTPCookieDiscard]; //设置sessionOnly
NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:cookieProperties];
[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
[self.myWebView loadRequest:request];
}
//第二次请求会自动带上Cookie
- (IBAction)test2:(id)sender {
NSURL *url = [NSURL URLWithString:@"http://dev.skyfox.org/cookie.php"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[self.mywebview2 loadRequest:request];
}
request还可以这样设置个Cookie
[request setHTTPShouldHandleCookies:YES];
[request setValue:[NSString stringWithFormat:@"%@=%@", [cookie name], [cookie value]] forHTTPHeaderField:@"Cookie"];
四.Cookie的本地缓存策略
//NSHTTPCookieAcceptPolicyAlways:保存所有cookie，这个是默认值
//NSHTTPCookieAcceptPolicyNever:不保存任何响应头中的cookie
//NSHTTPCookieAcceptPolicyOnlyFromMainDocumentDomain:只保存域请求匹配的cookie
[[NSHTTPCookieStorage sharedHTTPCookieStorage]setCookieAcceptPolicy:NSHTTPCookieAcceptPolicyNever];
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