medium10 pts · first answer countsapi-testinghttp-headersconcurrency

Stopping a lost update

Two admins edit product 3. Each sends PUT with If-Match: "v7", the ETag they read. The first succeeds. What should the second get?

A.200 OK, overwriting the first changeB.304 Not ModifiedC.412 Precondition FailedD.404 Not Found

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