deadlock

problem

python fastapi starlette testclient sse deadlock testing

135 tok +1

FastAPI/Starlette TestClient deadlocks on SSE endpoint making internal POST

Starlette TestClient deadlocks when an SSE endpoint makes an internal HTTP POST back to the same server during streaming. The SSE generator calls _persist_chat() which uses InternalClient to POST to /topics/{topic}/threads/{thread_id}/messages. TestClient is single-threaded, so the internal POST…

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