A Flutter Plugin to detect System proxy. When using HTTP client that are not proxy aware this plugin can help with finding the proxy from system settings which then can be used with HTTP Client to make a successful request.
dependencies: ... flutter_system_proxy: git: url: https://github.com/BrowserStackCE/flutter_system_proxy.git ref: main import 'package:flutter_system_proxy/flutter_system_proxy.dart'; ... var dio = new Dio(); var url = "http://...."; var proxy = await FlutterSystemProxy.findProxyFromEnvironment(url); (dio.httpClientAdapter as DefaultHttpClientAdapter).onHttpClientCreate = (HttpClient client) { client.findProxy = (uri) { return proxy; }; }; var response = await dio.get(url);// Create a custom adapter that can help resolve proxy based on urls // (This is important as in some senerio there are PAC files which might have different proxy based on different urls) class MyAdapter extends HttpClientAdapter { final DefaultHttpClientAdapter _adapter = DefaultHttpClientAdapter(); @override Future<ResponseBody> fetch(RequestOptions options, Stream<Uint8List>? requestStream, Future? cancelFuture) async { var uri = options.uri; var proxy = await FlutterSystemProxy.findProxyFromEnvironment(uri.toString()); // This line does the magic _adapter.onHttpClientCreate = (HttpClient clinet) { clinet.findProxy = (uri) { return proxy; }; }; return _adapter.fetch(options, requestStream, cancelFuture); } @override void close({bool force = false}) { _adapter.close(force: force); } } // Use a wrapper around getting dio void getDio(){ var dio = Dio(); dio.httpClientAdapter = MyAdapter(); return dio; }