API Testing · Middle · Question 15 of 75

What does `If-Match` with an ETag protect against?

1Overwriting changes someone else made in between
2Reading a resource that the cache already stores
3Sending requests to the wrong API version

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Correct answer: Overwriting changes someone else made in between

Explanation

If the resource changed since the client read it, the server answers 412 Precondition Failed instead of silently losing an update.

Further reading

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