从NSURLConnection的响应头读取数据

Question

如何从服务器响应中发送的标头中读取数据。我正在使用NSURLConnection发送请求。

Answer 1

如果网址是HTTP网址，那么您在连接的委托的NSURLResponse方法（或通过其他方法）中收到的-connection:didReceiveResponse:将为NSHTTPURLResponse，其中包含{ {3}}方法，可让您访问标题。

NSURLResponse* response = // the response, from somewhere
NSDictionary* headers = [(NSHTTPURLResponse *)response allHeaderFields];
// now query `headers` for the header you want

Answer 2

就我而言

    NSHTTPURLResponse *response = ((NSHTTPURLResponse *)[task response]);
    NSDictionary *headers = [response allHeaderFields];

好方法

    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)[task response];
    if ([httpResponse respondsToSelector:@selector(allHeaderFields)]) {
         NSDictionary *dictionary = [httpResponse allHeaderFields];
         NSLog(@"%@", [dictionary description]);
    }