string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E3%80%8A%E8%AF%AB%E5%AD%90%E4%B9%A6%E3%80%8B%E5%BE%97%E5%88%B0%E7%9A%84%E5%90%AF%E5%8F%91 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
《诫子书》得到的启发
