string(255) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8B%8D%E6%91%84%E4%B8%80%E4%B8%AA%E7%9F%AD%E8%A7%86%E9%A2%91%E7%9A%84%E6%B5%81%E7%A8%8B => Failed to connect to 14.18.46.51 port 38044: Connection refused"
拍摄一个短视频的流程
