string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BB%BA%E7%AD%91%E4%BA%91%E8%AF%BE%E6%B5%8B%E8%AF%95%E7%AD%94%E6%A1%88 => Failed to connect to 101.89.143.195 port 38109: Connection refused"
建筑云课测试答案
