Grokking Modern API Design Interview
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Rapid Fire Questions

A short follow-up question usually needs a direct answer, not a full explanation of the topic.

The interviewer asks:

"Why is that 412?"

A strong answer takes two or three sentences:

"412 means a caller-supplied precondition such as If-Match evaluated false. The caller must read current state and decide again; 409 would mean the request was current and valid in shape but conflicted with the product's state."

The shape is:

  1. state the rule;
  2. connect it to caller behavior; and
  3. name the cost when the answer is a choice.

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