REST Idempotency Interview Questions
☕Coffee Chat Question
Concept Made Simple
“Which HTTP methods are idempotent and why does it matter?”
🧠Mind Map Answer
Remember It Faster
Idempotent = calling it once or many times has the same effect on the server. It matters for safe retries on flaky networks.
⌨️Hands-on Keyboard
Learn by Doing
PUT /users/101
{ "name": "John" }
# Call it 5 times → user 101 still just has name "John"
# POST /users called 5 times → 5 new users🔥What If?
Think Beyond the Expected
How do you make POST safe to retry?
Use an idempotency key — the client sends a unique header (e.g. Idempotency-Key) and the server returns the original result for duplicates instead of creating a new resource.
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Plain-language foundations
I'm preparing for a software engineering interview and want to understand this from scratch, as a beginner. Topic: Idempotency (REST APIs) Interview question: "Which HTTP methods are idempotent and why does it matter?" Please: 1. Explain the core idea in simple, plain language, using an everyday analogy. 2. Define any technical terms you use. 3. Walk through one small, concrete example. 4. Finish with a single sentence I can easily remember. Keep the tone friendly and assume I'm new to this topic.
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