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* s3: answer GET and HEAD of a delete marker as S3 does A delete marker as the current version now returns 404 NoSuchKey with x-amz-delete-marker: true and the marker's x-amz-version-id. Asking for the marker by versionId returns 405 MethodNotAllowed with the same headers and Last-Modified, instead of 404 NoSuchKey. * s3: check the tag-conditioned read grant before answering a delete marker The marker branch returned before the entry-based policy recheck the rest of the read path performs, so an s3:ExistingObjectTag-conditioned Deny did not apply to the delete-marker response and its version headers. * s3: send Allow: DELETE with the delete-marker 405 RFC 9110 15.5.6 requires a 405 answer to list the methods the resource supports; S3 sends allow: DELETE for a delete marker named by versionId. * s3: keep delete-marker headers on conditional-read misses If-Match or If-Unmodified-Since against a current delete marker short- circuited to a bare NoSuchKey. Carry the resolved marker through the conditional result so the 404 keeps x-amz-delete-marker and x-amz-version-id, matching the unconditional read. * s3: exercise delete-marker responses through GET and HEAD handlers * s3: read marker version id from the entry before the caller's guess A delete marker written outside the normal PUT path can miss the version-id attribute while the v_<id> file name still names it; the new x-amz-version-id header would then report "null". Reuse versionIdFromEntry so both the handler and conditional-miss paths emit the real id. * s3: answer 405 for versionId=null on a suspended-versioning marker The null marker lives in .versions while getSpecificObjectVersion only checks the plain path, so GET/HEAD ?versionId=null answered NoSuchVersion. On that miss, look up the null marker and answer it like any other marker named by versionId. * s3: propagate null-marker lookup failures instead of answering 404 A transient filer error reading .versions/v_null was swallowed as "no marker", so GET/HEAD answered NoSuchVersion for a live read failure. NotFound and absent entries still mean no marker; anything else is InternalError now. --------- Co-authored-by: Chris Lu <chris.lu@gmail.com> Co-authored-by: chrislusf <chrislusf@users.noreply.github.com>