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https://issues.apache.org/jira/browse/HDDS-13920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18078257#comment-18078257
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Chu Cheng Li commented on HDDS-13920:
-------------------------------------
https://x.com/Sirupsen/status/2050895383866249618
> Conditional Reads (GetObject, HeadObject)
> -----------------------------------------
>
> Key: HDDS-13920
> URL: https://issues.apache.org/jira/browse/HDDS-13920
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: Ozone Manager, s3gateway
> Reporter: Chu Cheng Li
> Assignee: Chu Cheng Li
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.2.0
>
>
> See release 2.37.0 (Add conditional writes in CopyObject on destination key
> to prevent unintended object modifications.
> ----
> h4. Headers
> h5. If-Match: <etag> - Returns object only if ETag matches
> - Returns `412 Precondition Failed` if ETag doesn't match
> h5. If-None-Match: <etag> - Returns object only if ETag doesn't match
> - Returns `304 Not Modified` if ETag matches
> h5. If-Modified-Since: <timestamp> - Returns object only if modified after
> timestamp
> - Returns `304 Not Modified` if not modified
> h5. If-Unmodified-Since: <timestamp> - Returns object only if not modified
> since timestamp
> - Returns `412 Precondition Failed` if modified
> h4. Evaluation Order
> 1. If-Match is evaluated first
> 2. If-Unmodified-Since is evaluated next
> 3. If-None-Match is evaluated
> 4. If-Modified-Since is evaluated last
> If multiple conditions are present, they must all be satisfied.
> h4. Error Codes
> - 304 Not Modified - For If-None-Match and If-Modified-Since failures (cache
> hits)
> - 412 Precondition Failed - For If-Match and If-Unmodified-Since failures
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