How to modify the cookies of a request during redirect in objective-c?

I'm doing a simple login and noticed that during the redirect I only have 2 of the 3 required cookies to get in correctly. I captured the other cookie and put them together but for some reason I can't modify the headers on the fly?

- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSHTTPURLResponse *)response {
    NSURL* redirected_url = [request URL];
    NSString* querystr = [redirected_url absoluteString];

    if (response != nil) {
        NSArray* zzzz = [NSHTTPCookie 
                         cookiesWithResponseHeaderFields:[response allHeaderFields] 
                         forURL:[NSURL URLWithString:@""]];

        if ([zzzz count] > 0) {
            if ([querystr isEqualToString:@"https://www.localhost.com/specificurl.aspx"]) {
                NSMutableArray* actualCookies = [[NSMutableArray alloc] init];

                NSHTTPCookie* obj = [self.tmpCookies objectAtIndex:0];
              开发者_开发技巧  [actualCookies addObject:obj];
                [actualCookies addObject:zzzz];

                NSArray* authToken = [[NSArray alloc] initWithArray:actualCookies];

                //BLOWS UP HERE ?? NSDictionary* headers = [NSHTTPCookie requestHeaderFieldsWithCookies:authToken];
                //[request setAllHTTPHeaderFields:authToken];

                [viewController setAuthCookieAfterValidLogin:zzzz];
            }
        }
    }

    return request;
}

The general idea is to set this header to have the value of my combined cookies

---

I found that although I couldn't modify the existing request, that didn't stop me from creating a new request and simply returning that one :)

- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSHTTPURLResponse *)response {
    NSURL* redirected_url = [request URL];
    NSString* querystr = [redirected_url absoluteString];

    if (response != nil) {
        NSArray* zzzz = [NSHTTPCookie 
                         cookiesWithResponseHeaderFields:[response allHeaderFields] 
                         forURL:[NSURL URLWithString:@""]];

        if ([zzzz count] > 0) {
            if ([querystr isEqualToString:@"https://www.localhost.com/specificurl.aspx"]) {
                NSMutableArray* actualCookies = [[NSMutableArray alloc] init];
                NSUInteger i, count = [zzzz count];
                for (i = 0; i < count; i++) {
                    NSHTTPCookie* xxx = [zzzz objectAtIndex:i];
                    [actualCookies addObject:xxx];
                }

                NSHTTPCookie* obj = [self.tmpCookies objectAtIndex:0];
                [actualCookies addObject:obj];

                NSDictionary * headers = [NSHTTPCookie requestHeaderFieldsWithCookies:actualCookies];

                NSURL *url = [NSURL URLWithString:@"https://www.localhost.com/specificurl.aspx"];
                NSMutableURLRequest* xrequest = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];

                [xrequest setHTTPMethod:@"GET"];
                [xrequest setAllHTTPHeaderFields:headers];
                [xrequest setValue:@"https://www.localhost.com/Default.aspx?Site_ID=500000" forHTTPHeaderField: @"Referer"];

                [viewController setAuthCookieAfterValidLogin:zzzz];

                return xrequest;
            }
        }
    }

    return request;
}