string(258) "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%E5%8D%95%E4%BD%8D%E6%98%AF%E8%B5%AB%E5%85%B9%E5%90%97 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
网络带宽单位是赫兹吗
