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As described in [1], GetObjectAttributes "combines the functionality of HeadObject and ListParts. All of the data returned with each of those individual calls can be returned with a single call to GetObjectAttributes."

Among other things, the operation can return the S3 checksums of the component parts of multipart-uploaded objects.

AwsCli Example:

aws --endpoint-url=http://fedora.private:8000 s3api get-object-attributes --bucket sheik --key yerbouti --object-attributes "ETag" "ObjectSize" 
{
    "LastModified": "2024-01-19T18:05:58+00:00",
    "ObjectSize": 3340
}

[1] https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObjectAttributes.html