iPhone开发:通过NSURLRequest获得服务器返回的http header和http status

iPhone开发:通过NSURLRequest获得服务器返回的http header和http status

同步访问时的取法

NSURL *url = [NSURL URLWithString:@"http://www.test.com"];
NSURLRequest *request = [NSURLRequest requestWithURL: url];
NSHTTPURLResponse *response;
[NSURLConnection sendSynchronousRequest: request returningResponse: &response error: nil];
if ([response respondsToSelector:@selector(allHeaderFields)]) {
// 取得所有的请求的头
NSDictionary *dictionary = [response allHeaderFields];
NSLog([dictionary description]);
// 取得http状态码
NSLog(@"%d",[response statusCode]);

}

异步访问时则要实现委托的一个方法

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
// 注意这里将NSURLResponse对象转换成NSHTTPURLResponse对象才能去
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)response;
if ([response respondsToSelector:@selector(allHeaderFields)]) {
NSDictionary *dictionary = [httpResponse allHeaderFields];
NSLog([dictionary description]);
NSLog(@"%d",[response statusCode]);

}
}