string(233) "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%AFmbps%E5%90%97 => Failed to connect to 14.18.117.71 port 38093: Connection refused"
带宽的单位是mbps吗
