在关于在starage帐户上传视频文件的链接（https://docs.microsoft.com/en-us/azure/media-services/media-services-rest-get-started）的文档中给出的步骤中，我收到以下错误。 我正在使用路径属性中返回的api来上传在api中返回的blob内容，该内容被调用以创建SAS定位器URL。
<?xml version="1.0" encoding="utf-8"?>
<Error>
<Code>AuthenticationFailed</Code>
<Message>Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.
RequestId:26b8138d-0001-006c-72e3-9ed651000000
Time:2017-03-17T05:55:44.0536797Z</Message>
<AuthenticationErrorDetail>Signature fields not well formed.</AuthenticationErrorDetail>
</Error>