string(260) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%89%8B%E6%9C%BAapp%E7%9A%84%E5%BC%80%E5%8F%91%E7%94%A8%E5%88%B0%E7%9A%84%E6%8A%80%E6%9C%AF => Failed to connect to 101.91.112.32 port 38162: Connection refused"
手机app的开发用到的技术
