httpTokens

Indicates whether IMDSv2 is required.

• `optional` - IMDSv2 is optional. You can choose whether to send a session token in your instance metadata retrieval requests. If you retrieve IAM role credentials without a session token, you receive the IMDSv1 role credentials. If you retrieve IAM role credentials using a valid session token, you receive the IMDSv2 role credentials.

• `required` - IMDSv2 is required. You must send a session token in your instance metadata retrieval requests. With this option, retrieving the IAM role credentials always returns IMDSv2 credentials; IMDSv1 credentials are not available. Default: If the value of `ImdsSupport` for the Amazon Machine Image (AMI) for your instance is `v2.0`, the default is `required`.