if (openFile) {
    // Open blobs in new tab
    window.open(URL.createObjectURL(myBlob), "_blank");
} else {
    // Edge workaroud for downloading file
    if (window.navigator && window.navigator.msSaveOrOpenBlob) {
        window.navigator.msSaveOrOpenBlob(myBlob, file.name);
    } else {
        let fileURL = URL.createObjectURL(myBlob);
        let a = document.createElement("a");
        a.href = fileURL;
        a.download = filenameFromHeader;
        document.body.appendChild(a);
        a.click();
        URL.revokeObjectURL(fileURL);
    }
}

Content-Disposition: attachment; filename='myDocument.pdf'
Content-Type: application/octet-stream