string(243) "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%9C%BA%E7%94%B5pdf%E7%BD%91%E7%9B%98%E9%93%BE%E6%8E%A5 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
一建机电pdf网盘链接
