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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11WebSocket close code 1006 means the connection ended abnormally without a Close control frame being received. It does not identify whether FastAPI, the client, the ASGI server, a proxy, the network, or the model provider caused the interruption. Diagnose it by correlating the last successful traffic with logs across those layers, then change only the behavior the evidence implicates.
What WebSocket 1006 means
RFC 6455 reserves 1006 for applications to report abnormal closure; an endpoint must not send it as the status code in a WebSocket Close control frame. In other words, 1006 describes an unclean ending, not a reason for it. The connection may have disappeared before a close handshake completed. RFC 6455 distinguishes this from explicit statuses such as 1000 for normal closure and 1001 for an endpoint going away.
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Consequently, seeing 1006 in a browser or application log does not prove that FastAPI closed the socket. The interruption could have occurred at the client, network, server, intermediary, or upstream model path.
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How to trace the disconnect
Use the timing of the last successful message and compare records from each layer. A repeatable quiet interval is a clue to investigate transport liveness and intermediary idle policies, not proof of a particular timeout. Failures during synchronous model work are a reason to check whether that work blocks the event loop. Neither pattern alone establishes the cause.
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- Record the client event. Capture the close code and reason, connection state, timestamp, and time of the last message or token. A 1006 report is consistent with no Close frame being received; it does not reveal which component failed first.
- Check application handling. FastAPI documents that receiving from a closed WebSocket, for example with
await websocket.receive_text(), raisesWebSocketDisconnect. Catch it around the receive or streaming loop so an ordinary client departure is handled rather than logged as an unhandled application error. See FastAPI’s WebSocket documentation. - Compare the quiet interval. If disconnects recur after a similar period without traffic, inspect the deployed ping/pong behavior and any intermediary idle policies. Confirm the actual settings for your environment; the interval alone does not establish a default or vendor limit.
- Look for event-loop stalls. If drops coincide with synchronous model calls or CPU-heavy work, check whether the ASGI process can service the socket while that work runs. If failures cluster under concurrency, include event-loop lag and backpressure in the investigation. These are candidate mechanisms, not conclusions that follow from 1006.
- Correlate infrastructure and provider records. Compare the last token or upstream response with application exceptions or cancellation, ASGI server messages, and proxy, load-balancer, or CDN events. Record the deployed FastAPI, Starlette, Uvicorn, WebSocket implementation, proxy, and provider versions and configuration when investigating environment-specific behavior.
- Change one implicated behavior. After logs point to a layer, adjust that layer and observe whether the timing or frequency pattern changes. Preserve timely cancellation and resource limits; do not copy an unexplained timeout value from another deployment.
Handle disconnects and intentional closes correctly
FastAPI’s WebSocket API exposes Starlette’s WebSocket implementation. It supports accepting connections, receiving messages, and sending text, bytes, or JSON; a receive after closure can raise WebSocketDisconnect. Catch that exception where the receive or stream loop runs and perform any needed cleanup, such as stopping work tied to the departed client. See the FastAPI WebSocket guide and Starlette WebSocket documentation.
When the application intentionally closes a connection, use an appropriate valid status code rather than 1006. Starlette documents close(code=1000, reason=None). When working with raw ASGI messages, Starlette recommends its wrapped send() and receive() methods so WebSocket state remains updated; its iterator helpers stop when WebSocketDisconnect is raised.
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Choose a fix based on the evidence
There is no universal timeout or keepalive setting established for every FastAPI LLM-streaming deployment. Match the remedy to the layer supported by correlated logs:
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- Transport liveness: inspect ping/pong behavior when the evidence points to a quiet connection becoming unhealthy.
- Intermediary policy: check the configured idle behavior of the proxy, load balancer, or CDN when its events or timing implicate that path.
- Upstream request and cancellation: compare provider response timing and application cancellation or error records when the stream stops around an upstream event.
Change only the implicated behavior, then verify whether the disconnect pattern changes. The close code itself cannot tell you which remedy to use.
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