string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E4%B9%A6%E5%BA%94%E8%AF%A5%E6%80%8E%E6%A0%B7%E7%9C%8B%E6%89%8D%E8%83%BD%E6%9C%89%E6%95%88 => Failed to connect to 101.89.117.144 port 38056: Connection refused"
二建书应该怎样看才能有效
