JSON-RPC Transport

JSON-RPC transport supports A2A method dispatch over JSON-RPC 2.0 envelopes.

Client side

Use JsonRpcTransport with A2AClient. Default buffered outbound HTTP is available when libcurl is enabled and found; otherwise inject a requester.

Server side

Use JsonRpcServerTransport to decode envelopes, dispatch operations, and encode JSON-RPC responses.

Operational considerations

• Validate envelope fields strictly.
• Preserve client-provided request IDs in responses.
• Map structured SDK errors to consistent JSON-RPC error responses.
• Include auth metadata in RequestContext only after policy validation.