Getting marketdata without AUTH

cexIo.py

import websocket
import json

def on_msg(ws,msg):
    print(msg)

def on_cls(ws):
    print("close")

def on_open(ws):
    print("open")
    ws.send(json.dumps({'e': "subscribe", 'rooms': ["tickers", "pair-ETH-USD"]}))

def on_er(ws,er):
    print(str(er))

headers={
                         'User-Agent': 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)',
                         'Accept-Language': 'en-us',
                         'Keep-Alive': '300',
                         'Connection': 'keep-alive',
                         'Cache-Control': 'max-age=0', 'Origin':'https://cex.io'}

url = "wss://ws.cex.io/ws"
websocket.enableTrace(False)
ws = websocket.WebSocketApp(url, header=headers,cookie="_gat=1; _ga=GA1.2.844654147.1407933481", on_open=on_open, on_message=on_msg, on_close=on_cls, on_error = on_er)
ws.run_forever()