class CookHandler(tornado.web.RequestHandler):

    def get(self):
        cookie = self.get_cookie('my_cookie')
print('got cookie %s' % (cookie,))
if __name__ == '__main__':
    app = tornado.web.Application([('/cook', CookHandler)])
app.listen(8888)
IOLoop.instance().start()
how to add cookies to tornado httpclient