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I'm using this as an example

https://medium.com/@segaud.kevin/facebook-oauth-login-flow-with-flutter-9adb717c9f2e

to create a http server to serve html to a webview (as a way to serve a local html file and a local javascript file that it references). It returns net::ERR_CLEARTEXT_NOT_PERMITTED when it loads the webview

void main() async { HttpServer server = await HttpServer.bind("localhost", 8080); server.listen((HttpRequest request) async { request.response ..statusCode = 200 ..headers.set("Content-Type", ContentType.html.mimeType) ..write("<html><h1>Hello</h1></html>"); }); ... 
class DemoFlutterWebView3 extends StatefulWidget { _DemoFlutterWebViewState3 createState() => _DemoFlutterWebViewState3(); } class _DemoFlutterWebViewState3 extends State<DemoFlutterWebView3> { Widget build(BuildContext context) { return WebView( javascriptMode: JavascriptMode.unrestricted, initialUrl: "http://localhost:8080/"); } }

I noticed WebView showing ERR_CLEARTEXT_NOT_PERMITTED although site is HTTPS and added the android:usesCleartextTraffic="true" to the manifest file (guessing here!) but it didn't do anything.

Any ideas why the error or another way to show a html file that references a javascript file?

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  • Actually, I just found another way to achieve this...just save the .js file to local storage and the html file and set initialUrl of the webview to the file's location...much easier! Commented Mar 23, 2019 at 20:51
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