如何在Flutter中用http进行摘要认证？

在Flutter中使用http进行摘要认证，可以通过以下步骤实现：

导入http包：在Flutter项目的pubspec.yaml文件中，添加http依赖包，并执行flutter packages get命令进行包的安装。

dependencies:
  http: ^0.13.3

创建认证请求：使用http包提供的http.get()或http.post()方法创建HTTP请求，并设置请求头中的Authorization字段为摘要认证的值。

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();
}