string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=pp%E6%96%87%E4%BB%B6%E7%94%A8%E5%95%A5%E8%BD%AF%E4%BB%B6%E6%89%93%E5%BC%80 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
pp文件用啥软件打开
