middlewares.py 文件源码

def __init__(self, settings, user_agent="Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:54.0) Gecko/20100101"
                                            " Firefox/54.0"):
        super(RandomUserAgentMiddleware, self).__init__()
        self.user_agent = user_agent
        try:
            self.user_agent_engine = UserAgent()
        except Exception, ex:
            logging.error("Failed to create user agent engine object. Reason: %s", ex)