如何在Flutter中用http进行摘要认证？

dependencies:
  http: ^0.13.3

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

void main() async {
  final username = 'your_username';
  final password = 'your_password';
  final url = 'https://api.example.com/data';

  final client = http.Client();
  final response = await client.get(
    Uri.parse(url),
    headers: {
      'Authorization': 'Digest ${_generateDigestAuth(username, password)}',
    },
  );

  print(response.body);
}

String _generateDigestAuth(String username, String password) {
  final ha1 = md5.convert(utf8.encode('$username:Digest Realm:$password'));
  final ha2 = md5.convert(utf8.encode('GET:/data'));
  final digest = md5.convert(utf8.encode('$ha1:Nonce:00000001:00000002:auth:$ha2'));
  return digest.toString();
}