this.httpClient.post("/getreport/1", obj, { responseType: 'arraybuffer' }).subscribe((data) => {
var dd=new Uint8Array(data)
        var file = new Blob([dd], { type: 'application/pdf' });
        filename = this.report.key + ".pdf";



 let $link = document.createElement("a");
    let url = URL.createObjectURL(file);
    $link.setAttribute("target", "_blank");
    $link.setAttribute("href", url);
    $link.setAttribute("download", filename);
    $link.style.visibility = "hidden";
    document.body.appendChild($link);
    $link.click();

});