http 包头解析，不错的文档，本人从网上下载的

天气预报解析 NSString *urlString = [NSString stringWithFormat:@"http://m.weather.com.cn/data/%1$@.html",nameString]; NSURL *url = [NSURL URLWithString:urlString]; NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];