I was looking over this tutorial suggested by heroku (for NodeJs apps) for signing the s3 file via the server, then handling the upload directly from the client: I was looking over this tutorial suggested by h
阅读背景：
直接上传到s3 /客户端文件。使用这种方法是否存在将未使用的文件存储在s3存储桶中的问题？
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