string(257) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%9F%BA%E5%B0%BC%E7%B3%BB%E6%95%B0%E6%98%AF%E5%8F%8D%E6%98%A0%E4%BB%80%E4%B9%88%E7%9A%84 => Failed to connect to 101.91.112.32 port 38221: Connection refused"
基尼系数是反映什么的
