string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E9%80%A0%E6%A1%88%E4%BE%8B%E6%8A%BC%E9%A2%98%E8%BE%83%E5%87%86 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
一造案例押题较准
