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Hi,
In S3, the PUT Object request does not have “if-match” parameter - https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObject.html The client-side logic should handle this situation to do a comparison if the ETag is modified or not. https://docs.aws.amazon.com/AmazonS3/latest/API/API_Object.html#API_Object_Contents
If the Objects created through PUT/POST/COPY operation or through AWS Management console that are encrypted via SSE-S3 or plaintext, the ETags are the MD5 of the object data.
answered 9 months ago
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