https://www.cnblogs.com/pjl43/p/9866753.html

https://www.jianshu.com/p/55092eb06c17

requests:

https://*.com/questions/53101858/handling-cookies-in-flutter

heck out requests, a flutter library to help with modern RESTful http requests (basic cookies support and json)

• as of now, it uses shared_preferences which is not the best practice (security-wise) to store sensitive data (session-ids etc) Issue #1

pubspec.yaml

dependencies:

  requests: ^1.0.0

Usage:

import 'package:requests/requests.dart';

// ...

// this will persist cookies

await Requests.post("https://example.com/api/v1/login", body: {"username":"...", "password":"..."} ); 

// this will re-use the persisted cookies

dynamic data = await Requests.get("https://example.com/api/v1/stuff", json: true);

https://pub.dartlang.org/packages/dio#cookie-manager

https://github.com/fluttercommunity/flutter_webview_plugin/pull/51

Unfortunately, I was not considering operating LocalStorage from outside WebView.

Although I tried a little investigation,
there seems to be a case in which execution of evalJavascript or access to LocalStorage can not be performed normally due to the timing of WebView startup, the timing of page loading, and so on.

You may be able to avoid it by waiting until the first page loading is completed and then accessing LocalStorage with evalJavascript.

like this.

// On urlChanged stream

StreamSubscription<WebViewStateChanged> _onStateChanged;

_onStateChanged = flutterWebviewPlugin.onStateChanged.listen((WebViewStateChanged state) {

  if (mounted) {

    if (state.type == WebViewState.finishLoad) {

      flutterWebviewPlugin.evalJavascript(

          "window.localStorage.setItem('LOCAL_STORAGE','SOMETOKEN');" +

              "document.getElementById('showLocalStorageBtn').click();"

      );

    }

  }

});

i hope you will find it helpful.