hard20 pts · first answer countsci-cddeployments

Shipping a new API field to the app

A mobile app release will send a new required field to the API. Old app versions stay in use for months. What deployment order and API design avoids errors?

A.Deploy an API that accepts it as optional, then release the appB.Release the app first, then the API that requires itC.Deploy both on the same day and force all users to updateD.Make the field required in the API and return 400 to old apps

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Shipping a new API field to the app

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