string(257) "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%9A%84%E5%86%99%E4%BD%9C%E6%80%9D%E8%B7%AF%E6%98%AF%E6%80%8E%E6%A0%B7%E7%9A%84 => Received HTTP code 403 from proxy after CONNECT"
诫子书的写作思路是怎样的
