HeadFailedTotal:   atomic.LoadUint64(&v.HeadFailedTotal),
		GetFailedTotal:    atomic.LoadUint64(&v.GetFailedTotal),
	}
}

type replProxyAPI string

const (
	putObjectTaggingAPI    replProxyAPI = "PutObjectTagging"
	getObjectTaggingAPI    replProxyAPI = "GetObjectTagging"
	removeObjectTaggingAPI replProxyAPI = "RemoveObjectTagging"
	headObjectAPI          replProxyAPI = "HeadObject"

Any metadata changes on the source object version, such as metadata updates via PutObjectTagging, PutObjectRetention, PutObjectLegalHold and COPY api are replicated in a similar manner to target version, with the `X-Amz-Replication-Status` again cycling through the same states.

			Queries("acl", "")
		// GetObjectTagging
		router.Methods(http.MethodGet).Path("/{object:.+}").
			HandlerFunc(s3APIMiddleware(api.GetObjectTaggingHandler, traceHdrsS3HFlag)).
			Queries("tagging", "")
		// PutObjectTagging
		router.Methods(http.MethodPut).Path("/{object:.+}").
			HandlerFunc(s3APIMiddleware(api.PutObjectTaggingHandler, traceHdrsS3HFlag)).
			Queries("tagging", "")
		// DeleteObjectTagging