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2025-05-04 10:15:57
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Make Your API Idempotent, Avoid Ruining Clients Lives
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Idempotency is the idea that doing something multiple times should have no different affects as doing it once, especially important for actions that can get expensive, like booking a hotel room, or sending a payment.Idempotency in HTTPDifferent HTTP methods have idempotency baked in. GET, HEAD, PUT, DELETE, OPTIONS, and TRACE can all be executed multiple times without any unintended side effects occurring.That could mean being able to make multiple GET requests for a record without it suddenly vanishing, or doing something weird like sending emails to people. An API can still do simple things like logging a "viewed" event so you know that excuse making customer has seen their invoice and can't pretend their email isn't working.This is important because if a connection fails or a client's timeout kicks in then they should be able to retry without fear of the item being mysterious gone. You also would not expect a GET to delete something,PUT is idempotent...
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