string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E7%BA%A7%E5%BB%BA%E9%80%A0%E5%B8%88%E5%A7%94%E6%89%98%E5%8D%8F%E8%AE%AE%E5%90%88%E6%B3%95%E5%90%97 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
二级建造师委托协议合法吗
