string(225) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E9%80%9Fmbps%E6%98%AF%E4%BB%80%E4%B9%88%E5%8D%95%E4%BD%8D%E7%9A%84 => Received HTTP code 403 from proxy after CONNECT"
网速mbps是什么单位的
