Description:    "A header you provided implies functionality that is not implemented",
		HTTPStatusCode: http.StatusNotImplemented,
	},
	ErrPreconditionFailed: {
		Code:           "PreconditionFailed",
		Description:    "At least one of the pre-conditions you specified did not hold",
		HTTPStatusCode: http.StatusPreconditionFailed,
	},
	ErrRequestTimeTooSkewed: {
		Code:           "RequestTimeTooSkewed",

				success := true
				if err := r.ReplicateToTarget(ctx, api, c, result, retry); err != nil {
					if miniogo.ToErrorResponse(err).Code == "PreconditionFailed" {
						// pre-condition failed means we already have the object copied over.
						return
					}
					// object must be deleted concurrently, allow these failures but do not count them

			defer ns.Unlock(lkctx)
			opts.NoLock = true
		}

		obj, err := er.getObjectInfo(ctx, bucket, object, opts)
		if err == nil && opts.CheckPrecondFn(obj) {
			return objInfo, PreConditionFailed{}
		}
		if err != nil && !isErrVersionNotFound(err) && !isErrObjectNotFound(err) && !isErrReadQuorum(err) {
			return objInfo, err
		}
	}

			}, toObjectErr(errMethodNotAllowed, bucket, object)
		}
		return nil, err
	}

	// check preconditions before reading the stream.
	if checkPrecondFn != nil && checkPrecondFn(objInfo) {
		return nil, PreConditionFailed{}
	}

	opts.NoLock = true
	gr, err = z.serverPools[zIdx].GetObjectNInfo(ctx, bucket, object, rs, h, opts)
	if err != nil {
		return nil, err
	}

	if unlockOnDefer {