string(259) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=app%E5%BC%80%E5%8F%91%E6%95%99%E7%A8%8B%E4%BB%8E%E5%85%A5%E9%97%A8%E5%88%B0%E7%B2%BE%E9%80%9A => Failed to connect to 218.78.59.96 port 38043: Connection refused"
app开发教程从入门到精通
