如何检查url链接是否存在并在flutter中获取statusCode？

import 'package:http/http.dart' as http;

Future<void> checkUrl(String url) async {
  try {
    final response = await http.head(Uri.parse(url));
    final statusCode = response.statusCode;
    
    if (statusCode == 200) {
      print('URL链接存在');
    } else {
      print('URL链接不存在');
    }
  } catch (e) {
    print('发生错误：$e');
  }
}

void main() {
  checkUrl('https://www.example.com');
}

dependencies:
  http: ^0.13.3