Flutter Web view not loading in windows desktop application

The webview_flutter plugin doesn't exist for Windows yet, and in fact isn't possible to write yet since PlatformView support isn't implemented for Windows. (As the documentation says: "there are currently few plugins that actually have desktop support".)

Currently if you want a web view in your application it would need to be in a separate window, and you would need to write a plugin that creates and managers that Windows and web view.

While waiting for the official support from Flutter team, you can use flutter-webview-windows package. It adds support for Windows webview on Flutter and can communicate between the webview and flutter app (more detail here).

final _controller = WebviewController();@overridevoid initState() {  super.initState();  _init();}void _init() async {  await _controller.initialize();  await _controller.loadUrl('https://flutter.dev');  if (!mounted) return;  setState(() {});}@overridevoid dispose() {  super.dispose();  _controller.dispose();}@overrideWidget build(BuildContext context) {  return Scaffold(    appBar: AppBar(title: const Text('Webview')),    body: _controller.value.isInitialized        ? Webview(_controller)        : const Text('Not Initialized'),  );}