NSHTTPURLRequest标头

我想从网站上获得一些信息.我已经有了网站的HTML代码.但是，我想获取更多网站标题信息(例如http状态代码)

I would like to get some information from a website. I have already got the HTML code of the website. However, I would like to get more header information of the website (e.g. http status code)

阅读苹果库后，我发现有两种方法可以显示这些信息.但是，我只能使用其中一种方法(有警告)，而不能使用另一种方法.

After read the apple library, I found that there are 2 methods which can display those information. However, I can only use one of the methods (has warning), another cannot be used.

以下是代码.

NSHTTPURLResponse *response = nil;
NSError *error = nil;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

NSString *data=[[NSString alloc]initWithData:responseData encoding:NSUTF8StringEncoding];

NSDictionary *responseAlllHeaderFields = [response allHeaderFields];
// how can I convent the NSDictionary to the NSString, I cannot use the NSLog to display the information
NSLog(responseAlllHeaderFields); // <-- wrong

// returns the HTTP status code for the response
NSInteger *responseStatusCode = [response statusCode];
// warning: initialization makes pointer from integer without a cast
NSLog(@"\nThe status code is %d\n", responseStatusCode);

此外，还有其他方法可以获取标题信息吗?

Besides, are there are any other methods to get the header informatino?

非常感谢您.