gistfile1.txt

import tornado.web

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        if not self.get_cookie("mycookie"):
            self.set_cookie("mycookie", "myvalue")
            self.write("Your cookie was not set yet!")
        else:
            self.write("Your cookie was set!")

settings = {
    "cookie_secret": "testing",
    "httponly": True    
#    "login_url": "/login",
}

application = tornado.web.Application([
    (r"/", MainHandler),
], **settings)

application.listen(8888)
tornado.ioloop.IOLoop.current().start()