Design a Retry-Safe Create Flow
Design a creation flow that makes duplicate delivery harmless.
The pressure A queue worker may deliver the same create-shipment-label command twice. The carrier charges per label, and finance has already found $1,280 in duplicate labels this month. The shortcut will be copied into client code. Decision path Design a creation flow that makes duplicate delivery harmless. HTTP methods are a contract with every participant between the client and origin server. Safe methods tell crawlers, caches, SDKs, and retry logic that the request is intended for retrieval. Idempotent methods tell clients that repeating the same request has the same intended effect as sending it once. Those two properties matter more…
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