Consider this client code sending a POST request with an idempotency key:

medium📝 Predict Output Q5 of 15

Rest API - Advanced Patterns

headers = {"Idempotency-Key": "abc123"}
response1 = send_post(data, headers)
response2 = send_post(data, headers)

If the server implements idempotency correctly, what will be true about response1 and response2?

AThey will have the same status code and identical results

BThey will have different status codes and results

CThe second request will fail with a 409 Conflict error

DThe server will ignore the idempotency key and process both

Step-by-Step Solution

Solution:

Step 1: Understand idempotency key effect on repeated requests
Requests with the same key should return the same response without reprocessing.
Step 2: Compare expected responses
Both responses should have the same status and content because the server caches the first response.
Final Answer:
They will have the same status code and identical results -> Option A
Quick Check:
Same key means same response [OK]

Quick Trick: Repeated requests with same key get identical responses [OK]

Common Mistakes:

MISTAKES

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