string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E3%80%8A%E5%AD%A6%E9%9C%B8%E7%AC%94%E8%AE%B0%E3%80%8B%E7%94%B5%E5%AD%90%E4%B9%A6 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
《学霸笔记》电子书
