Why architecture matters here

Stream mistakes appear as head-of-line stalls, flow-control deadlocks, or resource exhaustion. Architecture matters because per-stream vs connection flow control decide behavior under load.

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The architecture: every piece explained

The top strip is types. Connection shared. Stream IDs partition into client/server bidi/uni. Bidi stream is a full duplex logical channel. Priority hints urgency.

The middle row is controls. Flow control per-stream + connection. STOP_SENDING / RESET cancel. 0-RTT streams for early data. Migration safe — streams survive path change.

The lower rows are practice. H3 mapping one request per stream. Observability per-stream. Ops — LB + resource + retries.

QUIC bidi streams — stream types + flow control + priority + resetmultiplexed logical streams on one connectionConnectionone UDP flowStream IDsclient + server bidi/uniBidi streamlogical channelPriorityurgency + incrementalFlow controlper-stream + connSTOP_SENDING / RESETcancel0-RTT streamsearly dataMigration safestreams surviveH3 mappingone stream per requestObservabilityper-stream metricsOps — LB + resource limits + retrieswindowsabortresumeportablemapwatchwatchoperateoperate
QUIC stream types + flow control + reset.
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End-to-end flow

End-to-end: client opens a bidi stream for a request. Server responds on same stream. Concurrent second request on another stream — no blocking. One stream cancels via RESET; others continue.