> **Experimental**
>
> `@aws-cdk/aws-imagebuilder-alpha` is an [**experimental**](/stability) (alpha) package: its API may change in any release, without a major version bump.
# HttpTokens

Indicates whether a signed token header is required for instance metadata retrieval requests.

- Stability: [Experimental](/cdk/api/stability.html)
- Source: [`lib/infrastructure-configuration.ts`](https://github.com/aws/aws-cdk/blob/v2.274.0-alpha.0/packages/@aws-cdk/aws-imagebuilder-alpha/lib/infrastructure-configuration.ts#L53)

## Example

```ts
const infrastructureConfiguration = new imagebuilder.InfrastructureConfiguration(this, 'InfrastructureConfiguration', {
  infrastructureConfigurationName: 'test-infrastructure-configuration',
  description: 'An Infrastructure Configuration',
  // Optional - instance types to use for build/test
  instanceTypes: [
    ec2.InstanceType.of(ec2.InstanceClass.STANDARD7_INTEL, ec2.InstanceSize.LARGE),
    ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE3, ec2.InstanceSize.LARGE)
  ],
  // Optional - create an instance profile with necessary permissions
  instanceProfile: new iam.InstanceProfile(this, 'InstanceProfile', {
    instanceProfileName: 'test-instance-profile',
    role: new iam.Role(this, 'InstanceProfileRole', {
      assumedBy: iam.ServicePrincipal.fromStaticServicePrincipleName('ec2.amazonaws.com'),
      managedPolicies: [
        iam.ManagedPolicy.fromAwsManagedPolicyName('AmazonSSMManagedInstanceCore'),
        iam.ManagedPolicy.fromAwsManagedPolicyName('EC2InstanceProfileForImageBuilder')
      ]
    })
  }),
  // Use VPC network configuration
  vpc,
  subnetSelection: { subnetType: ec2.SubnetType.PUBLIC },
  securityGroups: [ec2.SecurityGroup.fromSecurityGroupId(this, 'SecurityGroup', vpc.vpcDefaultSecurityGroup)],
  keyPair: ec2.KeyPair.fromKeyPairName(this, 'KeyPair', 'imagebuilder-instance-key-pair'),
  terminateInstanceOnFailure: true,
  // Optional - IMDSv2 settings
  httpTokens: imagebuilder.HttpTokens.REQUIRED,
  httpPutResponseHopLimit: 1,
  // Optional - publish image completion messages to an SNS topic
  notificationTopic: sns.Topic.fromTopicArn(
    this,
    'Topic',
    this.formatArn({ service: 'sns', resource: 'image-builder-topic' })
  ),
  // Optional - log settings. Logging is enabled by default
  logging: {
    s3Bucket: s3.Bucket.fromBucketName(this, 'LogBucket', `imagebuilder-logging-${Aws.ACCOUNT_ID}`),
    s3KeyPrefix: 'imagebuilder-logs'
  },
  // Optional - host placement settings
  ec2InstanceAvailabilityZone: Stack.of(this).availabilityZones[0],
  ec2InstanceHostId: dedicatedHost.attrHostId,
  ec2InstanceTenancy: imagebuilder.Tenancy.HOST,
  resourceTags: {
    Environment: 'production'
  }
});
```

## Members

| Member | Description |
| --- | --- |
| `OPTIONAL` | Allows retrieval of instance metadata with or without a signed token header in the request. |
| `REQUIRED` | Requires a signed token header in instance metadata retrieval requests. |

## Referenced by

- [`InfrastructureConfigurationProps`](/v2/docs/@aws-cdk_aws-imagebuilder-alpha.InfrastructureConfigurationProps).httpTokens