string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%9B%91%E7%90%86%E5%91%98%E9%9C%80%E8%A6%81%E6%8E%8C%E6%8F%A1%E7%9A%84%E7%9F%A5%E8%AF%86 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
监理员需要掌握的知识
