static/firmware.html

<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
    <script>
        function fetchFile(url, saveas) {
            fetch(url)
                .then((result) => {
                    if (result.status != 200) { throw new Error("Bad server response"); }
                    return result.blob();
                })
                .then((data) => {
                    console.log(data);
                    var url = window.URL.createObjectURL(data),
                        anchor = document.createElement("a");
                    anchor.href = url;
                    anchor.download = saveas;
                    anchor.click();

                    window.URL.revokeObjectURL(url);
                    document.removeChild(anchor);
                })
                .catch((error) => { console.log(error); });
        }

        document.addEventListener('DOMContentLoaded', function () {
            const basePath = 'https://raw.githubusercontent.com/keebio/keebio-firmware/master/';
            const urlParams = new URLSearchParams(window.location.search);
            const filePath = urlParams.get('path');
            if (filePath !== null) {
                fetchFile(basePath + filePath, filePath.split('/').pop());
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        }, false);

    </script>
</head>

<body></body>

</html>