Solvedflutter Making Network http error SocketException: Failed host lookup

Steps to Reproduce

Making Network http error when build release, even having internet connection
When build debug having no error

Error: SocketException: Failed host lookup: 'jsonplaceholder.typicode' (OS  Error No address associated with hostname, error = 7)

Code:

main.dart:

import 'dart:convert';

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

void main() => runApp(MyApp());

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

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key key}) : super(key: key);
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  static const url = 'https://jsonplaceholder.typicode.com/users';

  Future<List<Map<String, dynamic>>> _future;

  @override
  void initState() {
    super.initState();
    _future = fetch();
  }

  Future<List<Map<String, dynamic>>> fetch() {
    return http
        .get(url)
        .then((response) {
          return response.statusCode == 200
              ? response.body
              : throw 'Error when getting data';
        })
        .then((body) => json.decode(body))
        .then((list) => (list as List).cast<Map<String, dynamic>>());
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: RefreshIndicator(
        onRefresh: () async {
          _future = fetch();
          setState(() {});
          return _future;
        },
        child: FutureBuilder<List<Map<String, dynamic>>>(
          future: _future,
          builder: (context, snapshot) {
            if (snapshot.hasError) {
              return Center(
                child: Container(
                  constraints: BoxConstraints.expand(),
                  child: SingleChildScrollView(
                    physics: AlwaysScrollableScrollPhysics(),
                    child: Text(snapshot.error.toString()),
                  ),
                ),
              );
            }

            if (!snapshot.hasData) {
              return Center(
                child: CircularProgressIndicator(),
              );
            }
            return ListView.builder(
              itemCount: snapshot.data.length,
              itemBuilder: (BuildContext context, int index) {
                final item = snapshot.data[index];
                return ListTile(
                  title: Text(item['name']),
                  subtitle: Text(item['email']),
                );
              },
            );
          },
        ),
      ),
    );
  }
}

Screenshots:

Lenovo a2010: android 5.1

Philips S337: android 5.1:

Logs

flutter analyze

Analyzing test_http...
No issues found! (ran in 3.5s)

flutter doctor -v

[] Flutter (Channel dev, v1.2.0, on Microsoft Windows [Version 10.0.17134.523], locale en-US)
     Flutter version 1.2.0 at C:\flutter\flutter
     Framework revision 06b979c4d5 (3 weeks ago), 2019-01-25 14:27:35 -0500
     Engine revision 36acd02c94
     Dart version 2.1.1 (build 2.1.1-dev.3.2 f4afaee422)

[] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
     Android SDK at C:\Users\Admin\AppData\Local\Android\sdk
     Android NDK location not configured (optional; useful for native profiling support)
     Platform android-28, build-tools 28.0.3
     Java binary at: E:\Admin\Other\android-preview\android-studio\jre\bin\java
     Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)
     All Android licenses accepted.

[!] Android Studio (version 3.3)
     Android Studio at E:\Admin\Other\android-preview\android-studio
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
     Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)

[] IntelliJ IDEA Community Edition (version 2018.3)
     IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2018.3.3
     Flutter plugin version 32.0.3
     Dart plugin version 183.5153.38

[] VS Code (version 1.31.0)
     VS Code at C:\Users\Admin\AppData\Local\Programs\Microsoft VS Code
     Flutter extension version 2.22.3

[] Connected device (1 available)
     Philips S337  FS011641B06736  android-arm  Android 5.1 (API 22)
35 Answers

✔️Accepted Answer

@hoc081098 Double-check / make sure you have
<uses-permission android:name="android.permission.INTERNET" />
in your app's android/app/src/main/AndroidManifest.xml

Other Answers:

@hoc081098 Double-check / make sure you have
<uses-permission android:name="android.permission.INTERNET" />
in your app's android/app/src/main/AndroidManifest.xml

Great Info. This helped me.

As I was wondering a bit that, where to add this line in that file... figured it out to be at the end like:

image

Thank @zarko-tg.

Solve: add <uses-permission android:name="android.permission.INTERNET" /> to android/app/src/main/AndroidManifest.xml

Thank @zarko-tg.

Solve: add <uses-permission android:name="android.permission.INTERNET" /> to android/app/src/main/AndroidManifest.xml

This saves me, Why this is not in the documentation ?

Adding <uses-permission android:name="android.permission.INTERNET" /> solved this issue for me.

The documentation is out of date and should be updated. Since Flutter uses the internet permission internally in development mode it is always active when developing. When deploying the app to the play store, it is not active by default.

The documentation currently says:

uses-permission: Remove the android.permission.INTERNET permission if your application code does not need Internet access. The standard template includes this tag to enable communication between Flutter tools and a running app.

Which is misleading since the internet permission isn't in the production manifest (apparently it was in earlier flutter versions?). Please add a note to this so the documentation accurately explains that the internet permission has to be added to the production manifest in case it is needed.

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