Angular无法使用res.download从express下载文件

app.get('/download', function(req, res) {
  var filePath = '/path/to/file'; // 文件路径
  res.sendFile(filePath);
});

import { HttpClient } from '@angular/common/http';

export class MyComponent {
  constructor(private http: HttpClient) {}

  downloadFile() {
    const url = 'http://your-express-server/download'; // Express后端的下载路由
    this.http.get(url, { responseType: 'blob' }).subscribe((data: Blob) => {
      const downloadUrl = window.URL.createObjectURL(data);
      const link = document.createElement('a');
      link.href = downloadUrl;
      link.download = 'filename.ext'; // 下载文件的名称
      link.click();
    });
  }
}