diff --git a/lib/engine.js b/lib/engine.js
index acaa4188..fb2f88a1 100644
--- a/lib/engine.js
+++ b/lib/engine.js
@@ -209,12 +209,26 @@ Engine.prototype.onOpen = function () {
 
 Engine.prototype.onMessage = function (msg) {
   switch (msg.type) {
+    case 'noop':
+      break;
+
     case 'open':
       this.onOpen();
       break;
 
-    case 'heartbeat':
-      this.writePacket('heartbeat');
+    case 'ping':
+      this.writePacket('pong');
+      break;
+
+    case 'error':
+      var err = new Error('server error');
+      err.code = msg.data;
+      this.emit('error', err);
+      break;
+
+    case 'message':
+      this.emit('message', msg.data);
+      this.onmessage && this.onmessage.call(this, msg.data);
       break;
   }
 };