function downloadFile(url, filename) {
    fetch(url)
        .then(resp => resp.blob())
        .then(blob => {
            const url = window.URL.createObjectURL(blob);
            const a = document.createElement('a');
            a.style.display = 'none';
            a.href = url;
            a.download = filename;

            document.body.appendChild(a);
            a.click();
            window.URL.revokeObjectURL(url);
        })
};