string(241) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E7%BB%9C%E5%B8%A6%E5%AE%BD%E7%9A%84%E5%8D%95%E4%BD%8Dbps%E6%98%AF => Failed to connect to 61.171.74.35 port 38027: Connection refused"
网络带宽的单位bps是
