string(248) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B7%A5%E4%BD%9C%E5%AD%98%E5%9C%A8%E9%97%AE%E9%A2%98%E5%92%8C%E6%94%B9%E8%BF%9B%E6%8E%AA%E6%96%BD => Received HTTP code 403 from proxy after CONNECT"
工作存在问题和改进措施
