string(292) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%9F%AD%E4%BF%A1%E8%90%A5%E9%94%80%E7%9A%84%E4%BD%9C%E7%94%A8%E5%92%8C%E6%84%8F%E4%B9%89%E6%9C%89%E5%93%AA%E4%BA%9B%E5%91%A2 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
短信营销的作用和意义有哪些呢
