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%E4%B8%BB%E8%A6%81%E6%8A%80%E6%9C%AF => Failed to connect to 101.89.159.206 port 38187: Connection refused"
app开发的主要技术
