title: HttpContext is null for MVC controller
body: <p>I have a pretty vanilla controller:</p>
  
  <pre><code>public class HomeController : Controller
  {
      private readonly ApplicationUserManager _applicationUserManager;
  
      public HomeController()
      {
          _applicationUserManager = HttpContext.GetOwinContext().GetUserManager&lt;ApplicationUserManager&gt;();
      }
  }
  </code></pre>
  
  <p>However, when I hit it the <code>HttpContext</code> it's null.</p>