behavior was deprecated with RFC 2818 in May 2000 and was recently dropped
    from major web browsers.
 *  New: Honor the `Retry-After` response header. HTTP 503 (Unavailable)
    responses are retried automatically if this header is present and its delay
    is 0 seconds. HTTP 408 (Client Timeout) responses are retried automatically
    if the header is absent or its delay is 0 seconds.

				objInfo.TargetReplicationStatus(tgt.ARN) == replication.Failed ||
				ri.OpType == replication.ExistingObjectReplicationType {
				// if metadata is not updated for some reason after replication, such as
				// 503 encountered while updating metadata - make sure to set ReplicationStatus
				// as Completed.
				//
				// Note: Replication Stats would have been updated despite metadata update failure.

* kube-apiserver: requests to endpoints handled by unavailable extension API servers (as indicated by an `Available` condition of `false` in the registered APIService) now return `503` errors instead of `404` errors. ([#58070](https://github.com/kubernetes/kubernetes/pull/58070), [@weekface](https://github.com/weekface))

- Resolves a potential issue with GC and NS controllers which may delete objects after getting a 404 response from the server during its startup. This PR ensures that requests to aggregated APIs will get 503, not 404 while the APIServiceRegistrationController hasn't finished its job. ([#104748](https://github.com/kubernetes/kubernetes/pull/104748), [@p0lyn0mial](https://github.com/p0lyn0mial))

pkg syscall (freebsd-arm64), const SYS_UNDELETE ideal-int
pkg syscall (freebsd-arm64), const SYS_UNLINK = 10
pkg syscall (freebsd-arm64), const SYS_UNLINK ideal-int
pkg syscall (freebsd-arm64), const SYS_UNLINKAT = 503
pkg syscall (freebsd-arm64), const SYS_UNLINKAT ideal-int
pkg syscall (freebsd-arm64), const SYS_UNMOUNT = 22
pkg syscall (freebsd-arm64), const SYS_UNMOUNT ideal-int
pkg syscall (freebsd-arm64), const SYS_UTIMENSAT = 547

pkg net/http, const StatusRequestedRangeNotSatisfiable = 416
pkg net/http, const StatusResetContent = 205
pkg net/http, const StatusSeeOther = 303
pkg net/http, const StatusServiceUnavailable = 503
pkg net/http, const StatusSwitchingProtocols = 101
pkg net/http, const StatusTeapot = 418
pkg net/http, const StatusTemporaryRedirect = 307
pkg net/http, const StatusUnauthorized = 401