---
title: "Comment by Abhinav Sharma on \"Idempotency Keys: The Small Design Choice That Saves Incident Reviews\" | Hashnode"
description: "The subway retry example makes the expiry choice concrete. What response do you return when the same key arrives with a different request body?"
url: "https://hashnode.com/posts/idempotency-keys-the-small-design-choice-that-saves-incident-reviews/6ae184c8e954bbcefe8e7bc1/comment/6ae1c22ff32e7834fff9013e"
---

[Discussion](https://hashnode.com/posts/idempotency-keys-the-small-design-choice-that-saves-incident-reviews/6ae184c8e954bbcefe8e7bc1)

Comment [Idempotency Keys: The Small Design Choice That Saves Incident Reviews](https://hashnode.com/posts/idempotency-keys-the-small-design-choice-that-saves-incident-reviews/6ae184c8e954bbcefe8e7bc1)

[Abhinav Sharma](https://hashnode.com/@abhinavs1920)

[Oct 28](https://hashnode.com/posts/idempotency-keys-the-small-design-choice-that-saves-incident-reviews/6ae184c8e954bbcefe8e7bc1/comment/6ae1c22ff32e7834fff9013e)

The subway retry example makes the expiry choice concrete. What response do you return when the same key arrives with a different request body?