string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%AC%E4%BC%97%E5%8F%B7%E6%96%87%E7%AB%A0%E6%8A%95%E7%A8%BF%E7%9A%84%E6%A0%BC%E5%BC%8F => Failed to connect to 14.18.117.71 port 38164: Connection refused"
公众号文章投稿的格式
