string(231) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%B0%83%E6%9F%A5%E6%8A%A5%E5%91%8A%E7%9A%84%E6%A0%BC%E5%BC%8F => Failed to connect to 101.89.159.206 port 38075: Connection refused"
调查报告的格式
