200 OK — session open
> POST /ai/v1/session {"source": "bobw"}
< 200 OK req_01mhnolr 64ms POST /ai/v1/search {} Idempotency-Key: U8nMnnG-eOO_ Send ▶> POST /ai/v1/session {"source": "bobw"}
< 200 OK req_01mhnolr 64ms POST /ai/v1/search {} Idempotency-Key: U8nMnnG-eOO_ Send ▶