diff --git a/socketio/server.py b/socketio/server.py
index 227ff80..5e088d8 100644
--- a/socketio/server.py
+++ b/socketio/server.py
@@ -56,12 +56,16 @@ class Server(object):
                                  default.
     :param cors_credentials: Whether credentials (cookies, authentication) are
                              allowed in requests to this server.
+    :param pass_environ: If set to ``True``, the current ``environ`` is passed
+                         to all event handlers except for ``"disconnect"`` as
+                         second argument (right after ``sid``).
+                         (default is ``False``)
     :param engineio_logger: To enable Engine.IO logging set to ``True`` or pass
                             a logger object to use. To disable logging set to
                             ``False``.
     """
     def __init__(self, client_manager=None, logger=False, binary=False,
-                 json=None, **kwargs):
+                 json=None, pass_environ=False, **kwargs):
         engineio_options = kwargs
         engineio_logger = engineio_options.pop('engineio_logger', None)
         if engineio_logger is not None:
@@ -69,6 +73,8 @@ class Server(object):
         if json is not None:
             packet.Packet.json = json
             engineio_options['json'] = json
+        engineio_options['pass_environ'] = pass_environ
+        self.pass_environ = pass_environ
         self.eio = engineio.Server(**engineio_options)
         self.eio.on('connect', self._handle_eio_connect)
         self.eio.on('message', self._handle_eio_message)
@@ -392,12 +398,16 @@ class Server(object):
             if sid in self.environ:
                 del self.environ[sid]
 
-    def _handle_event(self, sid, namespace, id, data):
+    def _handle_event(self, environ, sid, namespace, id, data):
         """Handle an incoming client event."""
         namespace = namespace or '/'
         self.logger.info('received event "%s" from %s [%s]', data[0], sid,
                          namespace)
-        r = self._trigger_event(data[0], namespace, sid, *data[1:])
+        if self.pass_environ:
+            r = self._trigger_event(data[0], namespace, sid, environ,
+                                    *data[1:])
+        else:
+            r = self._trigger_event(data[0], namespace, sid, *data[1:])
         if id is not None:
             # send ACK packet with the response returned by the handler
             # tuples are expanded as multiple arguments
@@ -432,14 +442,20 @@ class Server(object):
         self.environ[sid] = environ
         return self._handle_connect(sid, '/')
 
-    def _handle_eio_message(self, sid, data):
+    def _handle_eio_message(self, *args):
         """Dispatch Engine.IO messages."""
+        if self.pass_environ:
+            sid, environ, data = args
+        else:
+            sid, data = args
+            environ = None
         if len(self._binary_packet):
             pkt = self._binary_packet[0]
             if pkt.add_attachment(data):
                 self._binary_packet.pop(0)
                 if pkt.packet_type == packet.BINARY_EVENT:
-                    self._handle_event(sid, pkt.namespace, pkt.id, pkt.data)
+                    self._handle_event(environ, sid, pkt.namespace, pkt.id,
+                                       pkt.data)
                 else:
                     self._handle_ack(sid, pkt.namespace, pkt.id, pkt.data)
         else:
@@ -449,7 +465,8 @@ class Server(object):
             elif pkt.packet_type == packet.DISCONNECT:
                 self._handle_disconnect(sid, pkt.namespace)
             elif pkt.packet_type == packet.EVENT:
-                self._handle_event(sid, pkt.namespace, pkt.id, pkt.data)
+                self._handle_event(environ, sid, pkt.namespace, pkt.id,
+                                   pkt.data)
             elif pkt.packet_type == packet.ACK:
                 self._handle_ack(sid, pkt.namespace, pkt.id, pkt.data)
             elif pkt.packet_type == packet.BINARY_EVENT or \
diff --git a/tests/test_server.py b/tests/test_server.py
index 372f61a..65ce135 100644
--- a/tests/test_server.py
+++ b/tests/test_server.py
@@ -23,7 +23,7 @@ class TestServer(unittest.TestCase):
         s = server.Server(client_manager=mgr, binary=True, foo='bar')
         s.handle_request({}, None)
         s.handle_request({}, None)
-        eio.assert_called_once_with(**{'foo': 'bar'})
+        eio.assert_called_once_with(**{'pass_environ': False, 'foo': 'bar'})
         self.assertEqual(s.manager, mgr)
         self.assertEqual(s.eio.on.call_count, 3)
         self.assertEqual(s.binary, True)
@@ -401,7 +401,7 @@ class TestServer(unittest.TestCase):
 
     def test_engineio_logger(self, eio):
         server.Server(engineio_logger='foo')
-        eio.assert_called_once_with(**{'logger': 'foo'})
+        eio.assert_called_once_with(**{'pass_environ': False, 'logger': 'foo'})
 
     def test_custom_json(self, eio):
         # Warning: this test cannot run in parallel with other tests, as it
@@ -417,7 +417,8 @@ class TestServer(unittest.TestCase):
                 return '+++ decoded +++'
 
         server.Server(json=CustomJSON)
-        eio.assert_called_once_with(**{'json': CustomJSON})
+        eio.assert_called_once_with(**{'pass_environ': False,
+                                       'json': CustomJSON})
 
         pkt = packet.Packet(packet_type=packet.EVENT,
                             data={six.text_type('foo'): six.text_type('bar')})