How to configure go back button in Browser for Flutter Web App

Question

I'm not asking about webview. This is about Flutter web app. I need to go back to a specific page when user press back button which is inbuilt in browser.

Any guessing ?

I'm getting this error when I press back button

Error: Assertion failed: org-dartlang- 
    sdk:///flutter_web_sdk/lib/_engine/engine/history.dart:110:14 
    _userProvidedRouteName != null
    is not true
        at Object.throw_ [as throw] (http://localhost:8300/dart_sdk.js:4770:11)
        at Object.assertFailed (http://localhost:8300/dart_sdk.js:4721:15)

Answer 1

In case if you don't want to navigate to a new page

    @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () async => true,
      child: Scaffold(

        key: _scaffold,
        backgroundColor: Colors.indigo,
        body: Center(
          child: Container(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                registerForm(),
                registerBtn(),
                SizedBox(height: 30,),
                _buildSignInButton()
              ],
            ),
          ),
        ),
      ),
    );
  }

Answer 2

onWillPop: () {
  Navigator.pop(context);
  return new Future(() => true);
}

Answer 3

onWillPop Navigate to a new Page

class webScope extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new WillPopScope(
      onWillPop: () async => Navigator.push(context, MaterialPageRoute(builder: (context) => new NewPageWidget())),
      child: Scaffold(
        appBar: new AppBar(
          title: new Text("webScope"),
        ),
      ),
    );
  }
}

Answer 4

If you are looking to emulate the browser back button from within a pushed route in your Flutter web app, I have achieved this via use of Router.neglect:

AppBar(
        leading: GestureDetector(
          child: const Icon(Icons.close_rounded, color: Colors.white),
          onTap: () => Router.neglect(context, () => context.pop()),
        ),
      ),

Answer 5

For disable this chrome back button you can use

 onWillPop: () {
  exit(0);
  return new Future(() => true);
}

and for hand back press for back page you can use willPop:

 WillPopScope(
  onWillPop: () async => Navigator.push(context, MaterialPageRoute(builder: (context) => YOUROLDPAGE()),
  child: Scaffold(
    appBar: new AppBar(
      title: new Text("Home Page"),
    ),
  ),
);