如何从Objective-c中返回302而不是200的Http Post捕获cookie

目前，如果我执行http GET或POST并返回200瓦/类型的应用程序/ json或xml我可以捕获使用此方法发回的cookie

Currently if I do an http GET or POST and it returns 200 w/ a type of application/json or xml I can capture the cookies sent back using this method

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
  NSArray* returnedCookies = [NSHTTPCookie 
                  cookiesWithResponseHeaderFields:[response allHeaderFields] 
                  forURL:[NSURL URLWithString:@""]];

    [responseData setLength:0];
}

但是当请求返回302（重定向）时，我该如何捕获cookie在init请求期间发送到客户端？目前，只有在重定向发生后，我才会收到GET请求200之后发回的cookie

But when the request returns a 302 (redirect) how can I capture the cookies sent down to the client during the init request? Currently I only get the cookies sent back after the 200 from the GET request following this redirect occurs

更新

我发现最终的解决方案如下。我需要if语句来验证resp是否有效，因为在我的实例中这个方法总共被调用了3次。一次用于初始化请求，然后再次用于302（我关心的那个），最后用于重定向网址的最后一次GET请求

What I found to be the final solution is below. I needed the if statements to verify the resp was valid as this method is called a total of 3 times in my instance. Once for the init request, then again for the 302 (the one I care about) and finally for the last GET request for the redirected url

- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSHTTPURLResponse *)response {
  if (response != nil) {
    NSArray* cookies = [NSHTTPCookie 
                     cookiesWithResponseHeaderFields:[response allHeaderFields] 
                     forURL:[NSURL URLWithString:@""]];

    if ([zzzz count] > 0) {
      //do something with cookies
    }
  }

  return request;
}