[google_sign_in_web] googleSignIn.signIn() hangs forever if can't connect to apis.google.com

Steps to Reproduce

In Chrome dev tools, add apis.google.com in "Network request blocking" tab
call: var user = await googleSignIn.signIn()

Nothing will happen and it will never return.

Expected results:

Expect an error.

Actual results:

Nothing, it never returns. eg:

print("before signIn");
user = await _googleSignIn.signIn();
print("after signIn");

"after signIn" never prints and no error is thrown.

@treeder

Hi @treeder
Is there a reason to block apis.google.com, can you please provide more details

I can reproduce the issue

code sample

import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';

GoogleSignIn _googleSignIn = GoogleSignIn(
  scopes: <String>[
    'email',
    'https://www.googleapis.com/auth/contacts.readonly',
  ],
);

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Material App',
      theme: ThemeData.dark(),
      home: Home(),
    );
  }
}

class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  String userName;
  bool iSignedIn = false;
  GoogleSignInAccount _currentUser;

  @override
  void initState() {
    super.initState();
    _googleSignIn.onCurrentUserChanged.listen((GoogleSignInAccount account) {
      setState(() {
        _currentUser = account;
      });
      if (_currentUser != null) {
        setState(() {
          iSignedIn = true;
          userName = account.displayName;
        });
      }
    });
    _googleSignIn.signInSilently().then((value) {
      if (value != null) {
        setState(() {
          userName = value.displayName;
        });
      }
    });
  }

  Future<void> _handleSignIn() async {
    try {
      await _googleSignIn.signIn();
    } catch (error) {
      print(error);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Material App Bar'),
      ),
      body: Center(
        child: Container(
          child: Text(iSignedIn ? userName : 'empty user name'),
        ),
      ),
      floatingActionButton: FloatingActionButton.extended(
        icon: Icon(Icons.add),
        label: Text(iSignedIn ? 'Sign Out' : 'Sign In'),
        onPressed: () {
          if (!iSignedIn) {
            _handleSignIn();
          } else {
            _googleSignIn.signOut();
            setState(() {
              iSignedIn = false;
            });
          }
        },
      ),
    );
  }
}

logs

PS C:\Users\taha\AndroidStudioProjects\triage\flutter_plugin_examples\google_signin_example> flutterb run -d chrome --debug  --web-hostname localhost --web-port 7357
Launching lib\main.dart on Chrome in debug mode...
Syncing files to device Chrome...                                       
 8,289ms (!)
Debug service listening on ws://127.0.0.1:53194/pRR4YSLUgYo=

Warning: Flutter's support for web development is not stable yet and hasn't
been thoroughly tested in production environments.
For more information see https://flutter.dev/web

  To hot restart changes while running, press "r" or "R".
For a more detailed help message, press "h". To quit, press "q".
[object Object]
[object Object]

Package version

google_sign_in: ^4.5.6

flutter doctor -v

[✓] Flutter (Channel beta, 1.23.0-18.1.pre, on Microsoft Windows [Version 10.0.19042.610], locale en-US)
    • Flutter version 1.23.0-18.1.pre at C:\Code\flutter_beta
    • Framework revision 198df796aa (4 weeks ago), 2020-10-15 12:04:33 -0700
    • Engine revision 1d12d82d9c
    • Dart version 2.11.0 (build 2.11.0-213.1.beta)


[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at C:\Code\sdk
    • Platform android-30, build-tools 30.0.2
    • Java binary at: C:\Code\android-studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    • All Android licenses accepted.

[✓] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[✓] Android Studio (version 4.1.0)
    • Android Studio at C:\Code\android-studio
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[✓] VS Code (version 1.51.1)
    • VS Code at C:\Users\taha\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.16.0

[✓] Connected device (4 available)
    • Android SDK built for x86 (mobile) • emulator-5554 • android-x86    • Android 8.0.0 (API 26) (emulator)
    • Web Server (web)                   • web-server    • web-javascript • Flutter Tools
    • Chrome (web)                       • chrome        • web-javascript • Google Chrome 86.0.4240.198
    • Edge (web)                         • edge          • web-javascript • Microsoft Edge 86.0.622.63

• No issues found!

Main reason is to emulate an app being used in China which can't access any Google domains.

I've reproduced this happening. We need to ensure that the underyling google sign in JS SDK has loaded.

We might be able to attach to the onerror event of its script tag, and see if the browser reports the error to know that the plugin hasn't been downloaded properly, another thing we can do (less optimal) is to allocate some timer on the JS callback of the script.

The second option is less efficient, but might end up being required anyway, especially depending on how the browser reacts to the actual blocking; and/or how the firewall is actually blocking the domain.

(I'll add this to the "Flutter Web Plugins" project, I can't work immediately on this.)

[google_sign_in] Redesign API for current identity SDKs (flutter#9267)

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

[google_sign_in] Redesign API for current identity SDKs (flutter#9267)

Navigation Menu

Repository navigation

[google_sign_in_web] googleSignIn.signIn() hangs forever if can't connect to apis.google.com #70427

Steps to Reproduce

9 remaining items

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

[google_sign_in_web] googleSignIn.signIn() hangs forever if can't connect to apis.google.com #70427

Description

Steps to Reproduce

Activity

TahaTesser commented on Nov 13, 2020

treeder commented on Nov 13, 2020

ditman commented on Dec 12, 2020

9 remaining items

github-actions commented on Jul 8, 2025

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions