iOS separate cookie handler for multi users

gistfile1.txt

/*
How to set cookieAcceptPolicy for ephemeral NSURLSession https://stackoverflow.com/questions/27290234/how-to-set-cookieacceptpolicy-for-ephemeral-nsurlsession
Multiple NSHTTPCookieStorage in the same app https://stackoverflow.com/questions/27132606/multiple-nshttpcookiestorage-in-the-same-app
NSHTTPCookieStorage for same URL but different users https://stackoverflow.com/questions/37597250/nshttpcookiestorage-for-same-url-but-different-users
*/

@interface NSHTTPCookieStorage (applePrivateHeader)
-(id)_initWithIdentifier:(id)arg1 private:(BOOL)arg2;
@end

@interface User()
@property (nonatomic, strong) NSHTTPCookieStorage *myHTTPCookieStorage;
@end

@implementation User

-(instancetype)init
{
    self = [super init];
    if (self) {
         //the [NSHTTPCookieStorage init] will generate a instance with no inner `NSHTTPCookieStorageInternal`, so.
        _myHTTPCookieStorage = [[NSHTTPCookieStorage alloc] _initWithIdentifier: @"user_id_xxx" private:0];
        _myHTTPCookieStorage.cookieAcceptPolicy = NSHTTPCookieAcceptPolicyAlways;
    }
    return self;
}

-(void)httpTask{
    NSURLSessionConfiguration *c =[NSURLSessionConfiguration ephemeralSessionConfiguration];

    c.HTTPCookieStorage = _myHTTPCookieStorage;
    
    [[[NSURLSession sessionWithConfiguration: c] dataTaskWithRequest:request completionHandler:nil] resume];
}


// load from file
-(void)(id)initWithCoder:(NSCoder *)aDecoder{
    NSArray<NSHTTPCookie*> *cookies = [aDecoder decodeObjectForKey:@"cookies"];
    
    for (NSHTTPCookie *cookie in cookies) {
        [_myHTTPCookieStorage setCookie: cookie];
    }
}

//save to file
- (void)encodeWithCoder:(NSCoder *)aCoder
    [aCoder encodeObject:_myHTTPCookieStorage.cookies forKey: @"cookies"];
}

@end