Delivers one payload over HTTP via :httpc (Erlang's own HTTP client, part of the :inets application bundled with every OTP install: no Hex dependency needed, same reasoning as net/http in the Ruby gem and java.net.http.HttpClient in the Java/Kotlin clients). Every failure mode (DNS, connection, timeout, TLS, a non-2xx response) is caught here and turned into false rather than a raised exception, since a broken or unreachable tracker must never be able to break the host app.

Every deliver* function answers true only when the payload was delivered. The attempt_* functions next to the batch ones answer a ForgeOpsTracker.DeliveryStatus instead, which is what tells a flusher whether a batch that did not go out is worth another attempt.