string(259) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=app%E7%9A%84%E8%AE%BE%E8%AE%A1%E4%B8%8E%E5%BC%80%E5%8F%91%E5%85%A5%E9%97%A8%E6%95%99%E7%A8%8B => Failed to connect to 14.18.117.71 port 38069: Connection refused"
app的设计与开发入门教程
