download_binary_file_using_post.ts

getBinaryObjById(id: number, token: string) {
    const req = {
      token: string
    };
    Observable.create(observer => {
      let xhr = new XMLHttpRequest();
      xhr.open('POST', './erp/binary-obj/find-binary-obj-by-id?id=' + id, true);
      xhr.setRequestHeader('Content-type', 'application/json');
      xhr.responseType='blob';
      xhr.onreadystatechange = function () {
        if (xhr.readyState === 4) {
          if (xhr.status === 200) {
            var contentType = "application/octet-stream";
            var blob = new Blob([xhr.response], { type: contentType });
            console.log(blob);
            observer.next(blob);
            observer.complete();
          } else {
            observer.error(xhr.response);
          }
        }
      };
      xhr.send(JSON.stringify(req));
    }).subscribe(blob => {
      console.log(blob);
      let reader = new FileReader();
      reader.onloadend = function () {
        window.location.href = reader.result;
      };
      reader.readAsDataURL(blob);
    });
  }