string(248) "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%E7%9A%84%E5%85%B7%E4%BD%93%E5%B7%A5%E4%BD%9C%E5%86%85%E5%AE%B9 => Received HTTP code 403 from proxy after CONNECT"
网络销售的具体工作内容
