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flutter - Getting Uncaught TypeError when extending BrowserHttpClientAdapter in dio - Stack Overflow

programmeradmin2浏览0评论

I use a custom adapter when I instantiate Dio. But when I run my app in chrome, I see error in console and nothing is shown.

Here is the complete code:

import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import 'package:dio/browser.dart';

class CustomBrowserHttpClientAdapter extends BrowserHttpClientAdapter {
  CustomBrowserHttpClientAdapter() {
    withCredentials = true;
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final Dio dio = Dio()..httpClientAdapter = CustomBrowserHttpClientAdapter();

    return Scaffold(
      appBar: AppBar(title: Text('Dio with Custom Adapter')),
      body: Center(
        child: ElevatedButton(
          onPressed: () async {
            try {
              final response = await dio.get('');
              print(response.data);
            } catch (e) {
              print('Error: $e');
            }
          },
          child: Text('Make Request'),
        ),
      ),
    );
  }
}

Here is the console output:

Uncaught TypeError: Class extends value undefined is not a constructor or null
    at load__packages__didgah__main_test_dart (main_test.dart.lib.js:128:13)
    at Object.execCb (require.js:1696:33)
    at Module.check (require.js:883:51)
    at Module.<anonymous> (require.js:1139:34)
    at require.js:134:23
    at require.js:1189:21
    at each (require.js:59:31)
    at Module.emit (require.js:1188:17)
    at Module.check (require.js:938:30)
    at Module.<anonymous> (require.js:1139:34)
    at require.js:134:23
    at require.js:1189:21
    at each (require.js:59:31)
    at Module.emit (require.js:1188:17)
    at Module.check (require.js:938:30)
    at Module.<anonymous> (require.js:1139:34)
    at require.js:134:23
    at require.js:1189:21
    at each (require.js:59:31)
    at Module.emit (require.js:1188:17)
    at Module.check (require.js:938:30)
    at Module.<anonymous> (require.js:1139:34)
    at require.js:134:23
    at require.js:1189:21
    at each (require.js:59:31)
    at Module.emit (require.js:1188:17)
    at Module.check (require.js:938:30)
    at Module.<anonymous> (require.js:1139:34)
    at require.js:134:23
    at require.js:1189:21
    at each (require.js:59:31)
    at Module.emit (require.js:1188:17)
    at Module.check (require.js:938:30)
    at Module.<anonymous> (require.js:1139:34)
    at require.js:134:23
    at require.js:1189:21
    at each (require.js:59:31)
    at Module.emit (require.js:1188:17)
    at Module.check (require.js:938:30)
    at Module.<anonymous> (require.js:1139:34)
    at require.js:134:23
    at require.js:1189:21
    at each (require.js:59:31)
    at Module.emit (require.js:1188:17)
    at Module.check (require.js:938:30)
    at Module.enable (require.js:1176:22)
    at Module.init (require.js:788:26)
    at callGetModule (require.js:1203:63)
    at ObjectpleteLoad (require.js:1590:21)
    at HTMLScriptElement.onScriptLoad (require.js:1717:29)```
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