index.html

<!DOCTYPE html>
<html>

<head>
    <base href="/">

    <meta charset="UTF-8">
    <meta content="IE=Edge" http-equiv="X-UA-Compatible">
    <meta content="A new Flutter project." name="description">

    <!-- iOS meta tags & icons -->
    <meta content="yes" name="apple-mobile-web-app-capable">
    <meta content="black" name="apple-mobile-web-app-status-bar-style">
    <meta content="ui" name="apple-mobile-web-app-title">
    <!--    <link href="icons/Icon-192.png" rel="apple-touch-icon">-->

    <!-- Favicon -->
    <link href="favicon.png" rel="icon" type="image/png"/>

    <title>ui</title>
    <link href="manifest.json" rel="manifest">

    <script>
    // The value below is injected by flutter build, do not touch.
    const serviceWorkerVersion = "163945611";


    </script>
    <!-- This script adds the flutter initialization JS code -->
    <script defer src="flutter.js"></script>
</head>

<body>
<script>
    window.addEventListener('load', function (ev) {
      // Download main.dart.js
      _flutter.loader.loadEntrypoint({
        serviceWorker: {
          serviceWorkerVersion: serviceWorkerVersion,
        },
        onEntrypointLoaded: function (engineInitializer) {
          engineInitializer.initializeEngine().then(function (appRunner) {
            appRunner.runApp();
          });
        }
      });
    });

    // load serviceworker earlier
    const serviceWorkerActivation = navigator.serviceWorker.register(
      "flutter_service_worker.js?v=" + serviceWorkerVersion
    );


</script>
</body>

</html>