接口权限的问题

Question

创建直播流的请求
curl "http://api.pili.qiniu.com/v1/streams" -H "Authorization: pili pScn-6GaRcyeVNWpvQHnSrVept_urxHeogOHR_lF:XMdkM-8gwH2r2JnskKSIO54i2zA=" -H "Content-Type: application/json" -X POST -v

签名字符串为：v1/streams\n
加密方法为(python下)：base64.urlsafe_b64encode(hmac.HMAC(key=secretKey,msg="v1/streams\n", digestmod=hashlib.sha1).digest())
结果
XMdkM-8gwH2r2JnskKSIO54i2zA=

返回：

< HTTP/1.1 401 Unauthorized
< Server: nginx/1.4.6 (Ubuntu)
< Date: Fri, 17 Apr 2015 08:46:47 GMT
< Content-Type: application/json
< Content-Length: 51
< Connection: keep-alive
< Access-Control-Allow-Origin: *
<
{"message":"invalid authorization","error":401001}