HTTP+JSON (REST) binding — removed in v1.1.0
The HTTP+JSON (REST) binding is no longer part of AAP as of v1.1.0. AAP's A2A interface uses the JSON-RPC 2.0 binding (A2A Section 9). There is no POST /message:send REST surface in AAP; SendMessage is invoked exclusively over JSON-RPC.
This page is kept only so existing links do not 404. For the current A2A transport, see the JSON-RPC 2.0 binding.
In AAP v1.0.0, a dealer agent MAY have additionally exposed an optional HTTP+JSON interface alongside its required JSON-RPC interface. AAP v1.1.0 removed that option from its A2A profile. AAP's A2A clients and dealer interfaces MUST use the JSON-RPC binding.
AAP 2.0 adds a separate native Poppy OpenAPI interface. It uses Poppy sessions and automotive skill routes; it does not restore A2A HTTP+JSON or /message:send.