human
I wrote the below code

    class WeRoBotHandler(RequestHandler, ):
        def prepare(self):
            timestamp = self.get_argument('timestamp', '')
            nonce = self.get_argument('nonce', '')
            signature = self.get_argument('signature', '')
            if (not robot.check_signature(timestamp=timestamp, nonce=nonce, signature=signature)):
                self.set_status(403)
                self.write(robot.make_error_page(html.escape((((self.request.protocol + '://') + self.request.host) + self.request.uri))))
                return
        def get(self):
            echostr = self.get_argument('echostr', '')
            self.write(echostr)
        def post(self):
            timestamp = self.get_argument('timestamp', '')
            nonce = self.get_argument('nonce', '')
            msg_signature = self.get_argument('msg_signature', '')
            message = robot.parse_message(self.request.body, timestamp=timestamp, nonce=nonce, msg_signature=msg_signature)
            self.set_header('Content-Type', 'application/xml;charset=utf-8')
            self.write(robot.get_encrypted_reply(message))
    return WeRoBotHandler

What's a good function header?
assistant
#Here's a good function header.

def make_handler(robot):