string(275) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%87%E8%80%83%E6%B3%A8%E5%AE%89%E5%B8%88%E7%9C%8B%E4%B9%A6%E9%A1%BA%E5%BA%8F%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 101.91.112.32 port 38162: Connection refused"
备考注安师看书顺序是什么
