title: Angular 4 new HttpClient content-disposition header
body: <p>I am trying to get a file (array buffer) from my backend using the new HttpClient.</p>
  
  <p>My code is pretty much like the following: </p>
  
  <pre><code>this.http.post(url, body, {responseType: 'blob', observe: 'response'})
    .subscribe(resp =&gt; {
      console.log(resp.headers.get('content-disposition'));
    });
  </code></pre>
  
  <p>The repsonse in my browser console is <em>null</em></p>
  
  <p>When I take a look at the network tab, then I see that content-disposition has a value like <em>attachment; filename="whatever"</em></p>
  
  <p>If I try to get <em>content-type</em> instead, then I receive something.</p>
  
  <p>Have you experienced something similar or can you tell me what I have to do else?
  Many thanks</p>