wx.cloud.downloadFile下载后返回的success的tempFilePath的链接打开，显示如下

You do not have permission to get URL '/%E5%9C%A8%E6%B4%AA%E6%B0%B4%E5%88%B0%E6%9D%A5%E4%B9%8B%E5%89%8D%EF%BC%8C%E6%9C%89%E5%93%AA%E4%BA%9B%E5%B1%85%E6%B0%91%E5%BA%94%E5%BD%93%E9%81%BF%E9%9A%BE%EF%BC%9F.jpg' from this server.

statecode返回403，如何解决