我想知道这是可能到吗？我一直得到报错“The body of your POST request is not well-formed multipart/form-data.”

我用一个云函数计算所需要到Auth，返还这个Auth给微信小程序后我想直接用wx.uploadFile上传图片到COS。以下是我实际的代码

**我用“bucketname-appid"代替了真实的bucketname和appid

这段代码会运行success中的callback，console.log显示如下

1. data:"<?xml version='1.0' encoding='utf-8' ?>↵<Error>↵ <Code>MalformedPOSTRequest</Code>↵

   <Message>The body of your POST request is not well-formed multipart/form-data.</Message>↵

   <Resource>bucketname-appid.cos.ap-guangzhou.myqcloud.com</Resource>↵

   <RequestId>NWJh....FiMTc=</RequestId>↵

   <TraceId>OGVm...gzMzdjOTA=</TraceId>↵</Error>↵↵"

2. errMsg:"uploadFile:ok"

3. statusCode:400