Static auth callback fails to redirect user
Static auth callback (src/auth/callback/index.html) trick
<html lang="en">
<head>
<meta charset="utf-8" />
<base href="/">
</head>
<body>
<script type="text/javascript">
window.location.href = "/#/auth/callback?" + window.location.search.substring(1);
</script>
</body>
</html>
is used for OAuth2 servers which do not support fragments (/#/auth/callback) in redirect URIs. Some browsers fail to use this trick and redirect user.