title: /pusher/auth endpoint returning 404 in Laravel
body: <p>I have built a Laravel app where I am trying to implement Web Sockets via Pusher.com (for the first time).</p>
  <p>While I have got public channel subscriptions working fine, I am struggling getting private channels working correctly.</p>
  <p>According to the laravel documentation you need to uncomment <code>App\Providers\BroadcastServiceProvider::class</code> in <code>app.php</code> config file which I have.</p>
  <p>My channels.php has the following rule(s)</p>
  <pre><code>Broadcast::channel('App.User.{id}', function ($user, $id) {
      return (int) $user-&gt;id === (int) $id;
  });
  
  Broadcast::channel('private-queue.business.{business}', function ($user, Business $business) {
      // @todo: add real authentication
      return true;
  });
  </code></pre>
  <p>Is there anything else I need to add to get <code>/pusher/auth</code> endpoint working?</p>