Updated example app to use gevent websocket if available

example/app.py

@@ -105,6 +105,15 @@ if __name__ == '__main__':
     elif async_mode == 'gevent':
         # deploy with gevent
         from gevent import pywsgi
+        try:
+            from geventwebsocket.handler import WebSocketHandler
+            websocket = True
+        except ImportError:
+            websocket = False
+        if websocket:
+            pywsgi.WSGIServer(('', 5000), app,
+                              handler_class=WebSocketHandler).serve_forever()
+        else:
             pywsgi.WSGIServer(('', 5000), app).serve_forever()
     else:
         print('Unknown async_mode: ' + async_mode)

example/requirements.txt

@@ -1,4 +1,2 @@
-eventlet==0.17.4
-greenlet==0.4.7
 python-engineio==0.1.0
 six==1.9.0