clientRequestToken

Each resource must have a unique client request token. The client token is used to implement idempotency. It ensures that the request completes no more than one time. If you retry a request with the same token and the same parameters, the request will complete successfully. However, if you try to create a new resource using the same token but different parameters, an HTTP 409 conflict occurs. If you omit this value, AWS SDKs will automatically generate a unique client request. For more information about idempotency, see Ensuring idempotency in Amazon EC2 API requests.