Node.js Angular 5-节点/Express-无法下载pdf

我正在尝试从本地文件夹下载pdf文件，该文件夹的结构如下 资产/test.pdf

server.js 演示文稿 我不知道我哪里做错了。在浏览器网络控制台中。它显示200行。但在普通浏览器中，控制台显示如下附件

注意：我参考了来自的ts文件

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非常感谢的帮助

您的回复中的内容处置标题在哪里？

app.get('/ePoint', (req,res)=>{
 // some dumb code :P
});

import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Headers } from '@angular/http';
import {Observable} from 'rxjs'; 
fileDownload() {
    const headers = new HttpHeaders();
    headers.append('Accept', 'application/pdf');
    this._http.get('http://localhost:3000/ePoint',  { headers: headers })
      .toPromise()
      .then(response => this.saveItToClient(response));
  }
    private saveItToClient(response: any) {
    const contentDispositionHeader: string = response.headers.get('Content-Disposition');
    const parts: string[] = contentDispositionHeader.split(';');
    const filename = parts[1].split('=')[1];
    const blob = new Blob([response._body], { type: 'application/pdf' });
    saveAs(blob, filename);
  }