The user taps the send money button, and the signal drops right after the request goes out. What should the app do?
You can't tell when the drop happened, so a blind retry can send the money twice. Send a client-generated idempotency key in a header, persist it locally, retry only with that same key, and after the limit settle the result through a status lookup API.
NetworkingMultiple choiceAdvanced
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#idempotency #retry #payments
NetworkingShort answerBasics
A payment confirmation API times out now and then. A junior engineer opened a PR that…
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NetworkingMultiple choiceBasics
An idempotent GET request failed. Select all the failures where an automatic retry (with…
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NetworkingMultiple choiceBasics
For a take-home assignment you wrote this code that POSTs JSON with URLRequest. Select…
#post