Chu Cheng Li created HDDS-13920:
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Summary: Conditional Reads (GetObject, HeadObject)
Key: HDDS-13920
URL: https://issues.apache.org/jira/browse/HDDS-13920
Project: Apache Ozone
Issue Type: Sub-task
Components: s3gateway
Reporter: Chu Cheng Li
Assignee: Chu Cheng Li
See release 2.37.0 (Add conditional writes in CopyObject on destination key to
prevent unintended object modifications.
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Headers
* If-Match: - Returns object only if ETag matches
* Returns 412 Precondition Failed if ETag doesn't match
* If-None-Match: - Returns object only if ETag doesn't match
* Returns 304 Not Modified if ETag matches
* If-Modified-Since: - Returns object only if modified after timestamp
* Returns 304 Not Modified if not modified
* If-Unmodified-Since: - Returns object only if not modified since timestamp
* Returns 412 Precondition Failed if modified
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.
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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