srStatePrefix = minioConfigPrefix + "/site-replication"
	srStateFile   = "state.json"
)

const (
	srStateFormatVersion1 = 1
)

var (
	errSRCannotJoin = SRError{
		Cause: errors.New("this site is already configured for site-replication"),
		Code:  ErrSiteReplicationInvalidRequest,
	}
	errSRDuplicateSites = SRError{
		Cause: errors.New("duplicate sites provided for site-replication"),
		Code:  ErrSiteReplicationInvalidRequest,
	}

	objInfo, err := getObjectInfo(ctx, bucket, object, opts)
	var proxy proxyResult
	if err != nil && !objInfo.DeleteMarker && !isErrMethodNotAllowed(err) {
		// proxy HEAD to replication target if active-active replication configured on bucket
		proxytgts := getProxyTargets(ctx, bucket, object, opts)
		if !proxytgts.Empty() {
			globalReplicationStats.incProxy(bucket, headObjectAPI, false)
			var oi ObjectInfo

		return rCfg, err
	}
	return rCfg, nil
}

// validateReplicationDestination returns error if replication destination bucket missing or not configured
// It also returns true if replication destination is same as this server.
func validateReplicationDestination(ctx context.Context, bucket string, rCfg *replication.Config, checkRemote bool) (bool, APIError) {
	var arns []string