404.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>Redirect</title>
    <script>
        (function() {
            const segments = 1;
            let location = window.location;
            let url = location.origin;
            for (let i = 0, n = 0; i < location.pathname.length; ++i) {
                if (location.pathname[i] === '/' && ++n === segments + 1) {
                    url += location.pathname.slice(0, i + 1);
                    url += '?page=' + encodeURIComponent(location.pathname.slice(i + 1));
                }
            }
            if (location.search) {
                url += '&query=' + encodeURIComponent(location.search.slice(1));
            }
            if (location.hash) {
                url += location.hash;
            }
            location.replace(url);
        }())
    </script>
</head>

<body>
</body>

</html>