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Context AngularJS $http provides no built-in retry mechanism, so applications that retry failed POST, PUT, or PATCH requests must implement custom logic. Because these methods are not inherently idempotent, a client-side timeout or 5xx response does not guarantee the server aborted the original write. A subsequent retry can therefore create duplicate records
Swift's URLSession provides a default retry policy that automatically resends data tasks receiving HTTP 500‑504 responses, as documented for iOS 15 and later. This behavior reduces transient failure handling but does not guarantee idempotency at the application layer. A core uncertainty involves whether the original request body is resent on each retry attem
Firefox 115 introduced the hidden preference network.http.retry.enable_post to allow automatic retries for POST requests that receive a 503 response with a Retry-After header. The feature remains experimental and is not exposed in the UI. The retry logic verifies that the request body is unchanged between attempts and honors the delay specified by Retry-Afte