string(257) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E7%BB%9C%E9%94%80%E5%94%AE%E4%B8%BB%E8%A6%81%E5%81%9A%E4%BB%80%E4%B9%88%E5%B7%A5%E4%BD%9C%E7%9A%84 => Received HTTP code 403 from proxy after CONNECT"
网络销售主要做什么工作的
