string(238) "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%E9%80%9A%E4%BF%A1%E5%B9%BF%E7%94%B5%E9%9A%BE%E5%BA%A6 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
一建通信广电难度
