title: Let user start celery task, and let user know when task is completed
body: <p>I have a profile page where user can see all his information.</p>
  
  <p>I want to create a button so the user can pull some specific external information.</p>
  
  <p>The button should start a celery task, and when the task is completed, the user should get a message with "completed"</p>
  
  <p>How can I do this?</p>
  
  <pre><code>&lt;a href="/start-task/"&gt;Pull external info&lt;/a&gt;
  </code></pre>
  
  <p>My "start-task" view:</p>
  
  <pre><code>def start_task(request):
  
      get_external_user_info.delay(user=request.user)
  
      return HttpResponse("Task started")
  </code></pre>
  
  <p>But how do I do a ajax check if the task is completed?</p>
  
  <p>Do I need another view? How would that view look like?</p>