[Solved] Analyze this server-side code handling idempotency keys:if key in cache: return cache[key] else:... | Rest API

Rest API - Advanced Patterns

Analyze this server-side code handling idempotency keys:

if key in cache:
    return cache[key]
else:
    response = execute_operation()
    cache[key] = response
    return response

What occurs if the client sends the same request twice with the same key?

AThe operation executes once; the second request returns cached response

BThe operation executes twice, causing duplicate effects

CThe server returns an error on the second request

DThe cache is cleared after the first request

Step-by-Step Solution

Solution:

Step 1: Check key presence
If the key exists in cache, the stored response is returned immediately.
Step 2: On first request
The operation executes and result is cached.
Step 3: On second request
The cached response is returned without re-executing the operation.
Final Answer:
The operation executes once; the second request returns cached response -> Option A
Quick Check:
Cache prevents duplicate processing on repeated keys [OK]

Quick Trick: Cached response returned on repeated keys [OK]

Common Mistakes:

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