string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%AF%AB%E5%AD%90%E4%B9%A6%E7%94%A8%E4%BA%86%E4%BB%80%E4%B9%88%E6%89%8B%E6%B3%95 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
诫子书用了什么手法
