REST Transport

REST is the HTTP+JSON transport path for clients and servers.

Client side

Use HttpJsonTransport with A2AClient. When libcurl is enabled and found, default outbound buffered HTTP can be used. Otherwise inject an HttpRequester implementation.

Server side

Use RestServerTransport to translate inbound framework requests into dispatcher calls.

Operational considerations

• Enforce TLS and auth policy at your edge or hosting layer.
• Set explicit request deadlines and payload limits.
• Log stable task IDs and request IDs.
• Validate protocol version headers where required.
• Prefer injected requesters for custom retry, proxy, mTLS, or observability policy.