string(267) "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%E5%8D%95%E4%BD%8D%E6%98%AF%E8%B5%AB%E5%85%B9%E5%90%97%E4%B8%BA%E4%BB%80%E4%B9%88 => Failed to connect to 125.88.227.171 port 38114: Connection refused"
带宽单位是赫兹吗为什么
