string(234) "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%E7%9A%84%E5%AE%8C%E6%95%B4%E6%B5%81%E7%A8%8B => Failed to connect to 101.89.143.195 port 38205: Connection refused"
app开发的完整流程
