# YarpCluster.withSessionAffinityConfig

- Module: [Aspire.Hosting.Yarp](/reference/api/typescript/aspire.hosting.yarp.md)
- Defined on: [YarpCluster](/reference/api/typescript/aspire.hosting.yarp/yarpcluster.md)
- Version: `13.4.0`
- Kind: `method`

Set the session affinity configuration for the cluster.

## Definition

```typescript
interface YarpCluster {
  // ... omitted for brevity
  withSessionAffinityConfig(config: YarpSessionAffinityConfig): YarpCluster;
}
```

## Signature

```typescript
withSessionAffinityConfig(config: YarpSessionAffinityConfig): YarpCluster
```

## Parameters

- `config` ([YarpSessionAffinityConfig](/reference/api/typescript/aspire.hosting.yarp/yarpsessionaffinityconfig.md))

## Returns

[YarpCluster](/reference/api/typescript/aspire.hosting.yarp/yarpcluster.md)

## Defined on

- [YarpCluster](/reference/api/typescript/aspire.hosting.yarp/yarpcluster.md) -- `handle`