string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E4%BC%9A%E7%9C%8B%E4%BB%80%E4%B9%88%E4%B9%A6%E6%AF%94%E8%BE%83%E5%A5%BD => Failed to connect to 14.18.117.71 port 38220: Connection refused"
注会看什么书比较好
