Dart http package is not working in built apk - flutter

Question

I'm developing a Flutter application that needs to make http requests. I installed the http package as usual, but when it came time to test the app in a real device, the http requests are hanging, I never get a response or status code. I decided then to start a new application just to mess around with http package, but still I got the same issue.
This is what I get while debugging in Android Emulator (I get a response almost immediately) and this is what I get on a real device (hanging forever).
Possible solutions I have already tried: built signed and unsigned apk, ran flutter clean before building apk, built apk using --no-shrink flag, changed the version of http package in pubspec.yaml, and none of these seemed to solve the issue.
I am using the latest stable version of Flutter SDK (v1.17.5), Android Studio for coding, and Ubuntu 20.04 as Operating System.
Here is my dart code:
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
class AuthScreen extends StatefulWidget {
#override
_AuthScreenState createState() => _AuthScreenState();
}
class _AuthScreenState extends State<AuthScreen> {
final TextEditingController _urlController = TextEditingController();
String _status = 'Waiting for request';
void _submit() async {
setState(() {
_status = 'Waiting for response...';
});
var response = await http.get(_urlController.text);
if (response.statusCode == 200) {
setState(() {
_status = response.body.substring(0, 40) + ' [...]';
});
} else {
_status = 'Something went wrong';
}
}
#override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextFormField(
controller: _urlController,
),
FlatButton(
child: Text('Send request'),
onPressed: _submit,
),
Text(_status)
],
),
),
);
}
}
Here is my pubspec.yaml, in case it's useful:
name: testingHttpPackage
description: A new Flutter application.
publish_to: 'none'
version: 1.0.0+1
environment:
sdk: ">=2.7.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
http: ^0.12.1
cupertino_icons: ^0.1.3
dev_dependencies:
flutter_test:
sdk: flutter
flutter:
uses-material-design: true

Answer 1

Did you mention internet permission in AndroidManifest.xml file?
In android/app/src/main/, there is AndroidManifest.xml file, put the below line after manifest tag i.e. after the first tag.
<uses-permission android:name="android.permission.INTERNET" />