WebSocketConnectionClosedException in socketIO_client

[afshinm]

I'm trying to connect to a local socket.io server from python/django using socketIO_client:

def connect() :
    socketIO = SocketIO('localhost', 3000)

But I the socket.io console I see this warning warn - websocket connection invalid and from django this message:

WebSocketConnectionClosedException at /crawler/add
No exception supplied

Also when I try to connect to an remote server (not local), everything works well.

What's the problem?