flutter_system_proxy 0.2.2

A Flutter plugin to detect system proxy settings, helping non-proxy-aware HTTP clients retrieve proxy configurations for successful network requests.

example/lib/main.dart

import 'dart:io';
import 'package:dio/adapter.dart';
import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import 'package:flutter_system_proxy/flutter_system_proxy.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  String _res = "Response";
  void _incrementCounter() {
    fetchLocalHost().then((value) {
      setState(() {
        _counter++;
        _res = value;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
            Text(
              '$_counter:$_res',
              style: Theme.of(context).textTheme.bodyLarge,
            )
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

Future<String> fetchLocalHost() async {
  try {
    var dio = new Dio();
    var url = 'http://ip-api.com/json';
    var proxy = await FlutterSystemProxy.findProxyFromEnvironment(url);
    (dio.httpClientAdapter as DefaultHttpClientAdapter).onHttpClientCreate =
        (HttpClient client) {
      client.findProxy = (uri) {
        return proxy;
      };
      return null;
    };
    var response = await dio.get(url);
    return response.toString();
  } catch (e) {
    print(e);
    return "Error";
  }
}