string(283) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E5%BB%BA%E6%A1%88%E4%BE%8B%E7%AD%94%E6%A1%88%E5%86%99%E9%94%99%E4%BA%86%E7%BB%93%E6%9E%9C%E8%BF%87%E4%BA%86 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
一建案例答案写错了结果过了
