[webview_flutter] getUserAgent returns empty user agent on iOS #135813
Description
Is there an existing issue for this?
- I have searched the existing issues
- I have read the guide to filing a bug
Steps to reproduce
- Run the code sample with webview_flutter 4.3.0 on iOS
- Check the console output
Expected results
The console output should contain the correct user agent (same as displayed by Google in the webview window)
Actual results
Only an empty string is being printed on iOS (android works as expected).
Code sample
Code sample
import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';
import 'package:webview_flutter_android/webview_flutter_android.dart';
import 'package:webview_flutter_wkwebview/webview_flutter_wkwebview.dart';
void main() => runApp(const MaterialApp(home: WebViewExample()));
class WebViewExample extends StatefulWidget {
const WebViewExample({Key? key}) : super(key: key);
@override
State<WebViewExample> createState() => _WebViewExampleState();
}
class _WebViewExampleState extends State<WebViewExample> {
late final WebViewController _controller;
@override
void initState() {
super.initState();
final PlatformWebViewControllerCreationParams params;
if (WebViewPlatform.instance is WebKitWebViewPlatform) {
params = WebKitWebViewControllerCreationParams();
} else if (WebViewPlatform.instance is AndroidWebViewPlatform) {
params = AndroidWebViewControllerCreationParams();
} else {
params = const PlatformWebViewControllerCreationParams();
}
_controller = WebViewController.fromPlatformCreationParams(params);
Timer.periodic(Duration(seconds: 1), (Timer timer) async {
print(await _controller.getUserAgent());
});
_controller.setJavaScriptMode(JavaScriptMode.unrestricted);
_controller.loadRequest(Uri.parse("https://www.google.com/search?q=my+useragent"));
}
@override
Widget build(BuildContext context) {
return SafeArea(
child: WebViewWidget(controller: _controller),
);
}
}
Screenshots or Video
No response
Logs
Logs
Launching lib/main.dart on iPhone 13 Pro Max in debug mode...
Running Xcode build...
└─Compiling, linking and signing... 9.7s
Xcode build done. 53.2s
[VERBOSE-2:FlutterDarwinContextMetalImpeller.mm(37)] Using the Impeller rendering backend.
Syncing files to device iPhone 13 Pro Max... 1,532ms
Flutter run key commands.
r Hot reload. 🔥🔥🔥
R Hot restart.
h List all available interactive commands.
d Detach (terminate "flutter run" but leave application running).
c Clear the screen
q Quit (terminate the application on the device).
A Dart VM Service on iPhone 13 Pro Max is available at:
http://127.0.0.1:51132/LCsNmDlL0ug=/
The Flutter DevTools debugger and profiler on iPhone 13 Pro Max is available at:
http://127.0.0.1:9101?uri=http://127.0.0.1:51132/LCsNmDlL0ug=/
flutter:
flutter:
flutter:Flutter Doctor output
Doctor output
flutter doctor -v
[✓] Flutter (Channel stable, 3.13.0, on macOS 12.6.3 21G419 darwin-x64, locale
en-US)
• Flutter version 3.13.0 on channel stable at
/Users/administrator/Documents/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision efbf63d9c6 (7 weeks ago), 2023-08-15 21:05:06 -0500
• Engine revision 1ac611c64e
• Dart version 3.1.0
• DevTools version 2.25.0
[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
• Android SDK at /Users/administrator/Library/Android/sdk
• Platform android-33, build-tools 31.0.0
• ANDROID_HOME = /Users/administrator/Library/Android/sdk
• ANDROID_SDK_ROOT = /Users/administrator/Library/Android/sdk
• Java binary at: /Applications/Android
Studio.app/Contents/jbr/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build
17.0.6+0-17.0.6b829.9-10027231)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 14.2)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 14C18
• CocoaPods version 1.12.1
[✗] Chrome - develop for the web (Cannot find Chrome executable at
/Applications/Google Chrome.app/Contents/MacOS/Google Chrome)
! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[✓] Android Studio (version 2022.3)
• Android Studio at /Applications/Android Studio.app/Contents
• 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
17.0.6+0-17.0.6b829.9-10027231)
[✓] Connected device (2 available)
• iPhone 13 Pro Max (mobile) • E27A0EED-67B6-4A6C-AF53-612A32ECB74D • ios
• com.apple.CoreSimulator.SimRuntime.iOS-16-2 (simulator)
• macOS (desktop) • macos •
darwin-x64 • macOS 12.6.3 21G419 darwin-x64
[✓] Network resources
• All expected network resources are available.
! Doctor found issues in 1 category.