Idempotency

Retry safely with an idempotency key

A response you never receive, because of a network problem for example, leaves you unsure whether the request went through. Retrying it blind risks doing the same thing twice.

Generate a v4 UUID and send it as the Walley-Idempotency header on every unique operation:

Walley-Idempotency: 03304b06-cb33-4f78-bcea-86cb4b202ba0

Retry with the same key and Walley applies the operation only once.