diff --git a/socketio/server.py b/socketio/server.py
index a5e2e47..1e8495e 100755
--- a/socketio/server.py
+++ b/socketio/server.py
@@ -278,6 +278,16 @@ class Server(object):
         self._trigger_event('disconnect', namespace, sid)
         self.manager.disconnect(sid, namespace=namespace)
 
+    def transport(self, sid):
+        """Return the name of the transport used by the client.
+
+        The two possible values returned by this function are ``'polling'``
+        and ``'websocket'``.
+
+        :param sid: The session of the client.
+        """
+        return self.eio.transport(sid)
+
     def handle_request(self, environ, start_response):
         """Handle an HTTP request from the client.
 
diff --git a/tests/test_server.py b/tests/test_server.py
index d410362..8e3a868 100755
--- a/tests/test_server.py
+++ b/tests/test_server.py
@@ -144,6 +144,13 @@ class TestServer(unittest.TestCase):
         s._emit_internal('123', u'my event', b'my binary data')
         self.assertEqual(s.eio.send.call_count, 2)
 
+    def test_transport(self, eio):
+        s = server.Server()
+        s.eio.transport = mock.MagicMock(return_value='polling')
+        s._handle_eio_connect('foo', 'environ')
+        self.assertEqual(s.transport('foo'), 'polling')
+        s.eio.transport.assert_called_once_with('foo')
+
     def test_handle_connect(self, eio):
         mgr = mock.MagicMock()
         s = server.Server(client_manager_class=mgr)