Preventing duplicate writes during Invoke-RestMethod retry loops

Implementing custom retry logic in PowerShell for API interactions often involves wrapping Invoke-RestMethod in a loop with exponential backoff to handle transient 503 or 429 errors.

A significant challenge arises when a request reaches the server and is processed, but the connection drops before the client receives the success response. If the retry logic triggers a second identical POST or PUT request, it may result in duplicate resource creation or redundant data writes if the API is not natively idempotent.

While client-side checks can verify resource existence before retrying, this introduces a race condition and additional network overhead.

• What is the most reliable method to implement idempotency tokens within a PowerShell wrapper for REST calls?
• Does PowerShell provide a mechanism to track request state across retries to avoid duplicating writes when the server has already processed the initial attempt?