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by grandalf 3232 days ago
Unless I'm doing some sort of pure REST API I'm simply using HTTP as a transport protocol for my application specific protocol.

If HTTP delivers my application protocol's message successfully, it's an HTTP 2xx, but my application's protocol may have a range of statuses that are not "transport-like" in the way HTTP status codes are, which are the main things that API consumers care about, assuming the basic transport is working.