Idempotency

Network calls fail in ways that leave you unsure whether a request went through. Send an Idempotency-Key header on POST /questions, and a retry is always safe.

• Same key and same body: returns the original request instead of creating a new one.
• Same key with a different body: returns 409 idempotency_conflict.
• Keys are kept for 24 hours.

Choosing a key

Derive the key from something stable in your own system, such as your record ID plus the question, rather than generating a new random value on each attempt. A new key on every retry defeats the purpose.