title: In WebAPI, FormsAuthentication does not seem to remember cookie
body: <p>In my webAPI I have a call to the controller that does </p>
  
  <pre><code>FormsAuthentication.SetAuthCookie(login.Username, true);
  </code></pre>
  
  <p>but the cookies don't seem to set.  </p>
  
  <p>Is there a way to get this to happen in webAPI? I know there is know system.web so maybe that is my issue (but the call is there)</p>