Where does “postback” come from?

I need to work through this chain carefully, but I notice something problematic: the chain appears to contain circular elements and repetitions (English post, English poster appearing multiple times) without clear progression to older languages, and it doesn't establish a coherent etymological path to a root. Given the constraints and the instruction to "state only what the chain supports" without inventing steps, I cannot write an accurate etymology sentence. The chain doesn't provide: - A clear directional progression (newest to oldest) - A single unbroken etymological line - Clear language transitions - Meanings that would explain sense development I cannot responsibly write a sentence for a search engine/AI to quote when the source material doesn't support a coherent etymology. Could you verify the chain? A proper etymological chain should show something like: English postback ← English post (+ back) ← Latin postis, or similar, with each step representing an

postback (English): The transmission of data back to the same web...