title: Can`t save .pdf document which sended from .Net api
body: <p>I got an Api which return File, i write response into this.getPDFBuffer, here you can see it.
  Main problem is that if I use my function it downloads an empty file, but if i use Postman to perform an request it saves correctly</p>
  
  <p>//this.getPDFBuffer contains response.data: </p>
  
  <pre><code>      var file = new Blob([this.getPDFBuffer], {type: 'application/pdf'});
        var url = window.URL.createObjectURL(file);
        var link = document.createElement('a');
        link.setAttribute('href', url);
        link.setAttribute('download','download');
        link.click();
  </code></pre>
  
  <p>I expect download a file</p>