string(276) "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%92%8C%E5%90%9E%E5%90%90%E9%87%8F%E7%9A%84%E5%8C%BA%E5%88%AB%E5%92%8C%E5%85%B3%E7%B3%BB => Failed to connect to 101.89.143.195 port 38175: Connection refused"
带宽和吞吐量的区别和关系
