title: Pusher - Private channel subscription
body: <p>I have a code with subscribe private channels, and when I try make a subscription I have the next message:</p>
  
  <p>Pusher : Couldn't get auth info from your webapp : 404 </p>
  
  <p><strong>Scenario:</strong></p>
  
  <p>Javascript(Sencha touch) and PHP(Laravel)</p>
  
  <p><em>The subscription is in javascript:</em></p>
  
  <pre><code>    Pusher.channel_auth_endpoint = "/pusher.php";
  
      var APP_KEY = '4324523452435234523';
      var pusher = new Pusher(APP_KEY);
      var channel = pusher.subscribe('private-l2');
      channel.bind('pusher:subscription_succeeded', function() {
        alert("ahora siiii");
      });
  
      // for debugging purposes. Not required.
      Pusher.log = function(msg) {
        if(window.console &amp;&amp; window.console.log) {
          window.console.log("PUSHER LOG: "+msg);
        }  
      }
  </code></pre>
  
  <p><em>AND the pusher.php / LARAVEL</em></p>
  
  <pre><code>    $this-&gt;app_id = '66981';
      $this-&gt;app_key = '4324523452435234523';
      $this-&gt;app_secret = 'f34632459911e2670dcf';
  
     $pusher = new Pusher($this-&gt;app_key, $this-&gt;app_secret, $this-&gt;app_id);
      $auth    = $pusher-&gt;socket_auth(Input::get('channel_name'), Input::get('socket_id'));
  
      echo $auth;
  </code></pre>
  
  <p><em>The result is the error:</em></p>
  
  <pre><code>     Pusher : State changed : connecting -&gt; connected
       Pusher : Couldn't get auth info from your webapp : 404 
  </code></pre>