string(234) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B8%A6%E5%AE%BDmb%E5%92%8Cmb%E5%A6%82%E4%BD%95%E6%8D%A2%E7%AE%97 => Failed to connect to 101.91.112.32 port 38195: Connection refused"
带宽mb和mb如何换算
