openidconnect_web/callback.html

<!DOCTYPE html>
<html>

<head>
    <script>
        const AUTH_DESTINATION_KEY = "openidconnect_auth_destination_url";
        const AUTH_RESPONSE_KEY = "openidconnect_auth_response_info";

        window.onload = function () {
            if (window.opener && window.opener !== window) { //Used when working as a popup. Uses post message to respond to the parent window                
                var parent = window.opener ?? window.parent;
                parent.postMessage(location.href, "*");
            } else { //Used for redirect loop functionality.                
                //Get the original page destination                
                const destination = sessionStorage.getItem(AUTH_DESTINATION_KEY || "/");
                sessionStorage.removeItem(AUTH_DESTINATION_KEY);
                //Store the current window location that will be used to get the information for authentication
                sessionStorage.setItem(AUTH_RESPONSE_KEY, window.location);

                //Redirect to where we're going so that we can restore state completely
                location.assign(destination);
            }
        }
    </script>
</head>

<body>
</body>

</html>