问提交请求后 返回 签名为空 ？

POST /face/livegetfour HTTP/1.1

Authorization : WXlKwqpTbmf4pwz5qtlqJKrIeWFhPTEyNTQzODY0MTAmYj10ZW5jZW50eXVuJms9QUtJREtQUEZ1T2F0cmZRNFpPcGFrNWIzS1BKSHpjQVhyZ2t5JnQ9MTUxNjk1MDQ5NiZlPTE1MTY5NTE0OTYmcj0xNTk3NDU5NjQy

Content-Type: application/json; charset=utf-8

Host: service.image.myqcloud.com

Connection: close

User-Agent: Paw/3.1.5 (Macintosh; OS X/10.13.1) GCDHTTPRequest

Content-Length: 22

{"appid":"1254386410"}

HTTP/1.1 401 Unauthorized

Server: nginx

Date: Fri, 26 Jan 2018 07:19:03 GMT

Content-Type: application/json; charset=utf-8

Content-Length: 61

Connection: close

{"code":4,"message":"has no sign or sign is empty","data":{}}

• 标题：活体检测—获取唇语验证码 - 智能图像服务 - 产品文档 - 帮助与文档 - 腾讯云
• 地址：https://cloud.tencent.com/document/product/641/12431