A POST may have committed before its response was lost. What makes retrying the create op…

A POST may have committed before its response was lost. What makes retrying the create operation safe?

1. Use one stable idempotency key across attempts and deduplicate atomically on the server
2. Generate a new random idempotency key before every attempt
3. Retry whenever response.json() raises an exception
4. Set allowed_methods=None because POST is then idempotent