如何在dart或flutter中以formdata形式传递请求参数

dependencies:
  http: ^0.13.3

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

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

void postData() async {
  var url = Uri.parse('https://example.com/your-endpoint');
  var request = http.MultipartRequest('POST', url);

  // 添加请求参数
  request.fields['name'] = 'John Doe';
  request.fields['email'] = 'johndoe@example.com';

  // 添加文件
  var file = await http.MultipartFile.fromPath('file', 'path/to/file');
  request.files.add(file);

  var response = await request.send();

  if (response.statusCode == 200) {
    print('请求成功');
  } else {
    print('请求失败，错误码： ${response.statusCode}');
  }
}