string(248) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%AE%80%E8%BF%B0%E7%BD%91%E7%AB%99%E6%8E%A8%E5%B9%BF%E7%9A%84%E5%B8%B8%E7%94%A8%E6%96%B9%E6%B3%95 => Received HTTP code 403 from proxy after CONNECT"
简述网站推广的常用方法
