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Fix Clock Skew according to internal specification - #3472
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Madrigal
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wty-Bryant
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Jul 10, 2026
| if err != nil { | ||
| t.Fatalf("enabled: unexpected error: %v", err) | ||
| } | ||
| if skew, ok := GetAttemptSkew(mdEnabled); !ok || skew != 5*time.Minute { |
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nit: from first glance there might be transient case where calculated skew is slight diff from exact 5 min since we use midpoint of req/resp time for calculation now, but that should not impact too much
… attempts when retrying
lucix-aws
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Jul 20, 2026
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needs a changelog btw, fixandship |
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Update our implementation of Clock Skew to match our internal specification.
Update Skew computation
serverTime - responseAtformula with the internal spec midpoint calculation:serverTime - midpoint(requestAt, responseAt), which bounds measurement error to half the round-trip time.maxTrustedRequestDuration(15 min) guard — responses slower than this discard the skew candidate.Ageheader check — cached responses are not used for skew measurement.Add disable flag
DisableClockSkewCorrectionflag to disable clock skew computationAWS_DISABLE_CLOCK_SKEW_CORRECTION), shared config profile (disable_clock_skew_correction), and programmatic.Update codes
definiteSkewCodesand possibleSkewCodesinto a singleclockSkewCodesset.RequestTimeTooSkewedandAccessDeniedExceptionto the set; removed RequestExpired and RequestInTheFuture.