string(239) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B8%A6%E5%AE%BD%E7%9A%84%E5%8D%95%E4%BD%8D%E6%98%AF%E6%AF%94%E7%89%B9%E6%AF%8F%E7%A7%92 => Received HTTP code 403 from proxy after CONNECT"
带宽的单位是比特每秒
