Architecture

                    +-------------------+
                    |    Application    |
                    +--------+----------+
                             |
                    +--------v----------+
                    |     nhttp3-h3     |  HTTP/3 frames, headers
                    +--------+----------+
                             |
              +--------------+--------------+
              |              |              |
     +--------v--------+    |    +---------v--------+
     |   nhttp3-qpack  |    |    |    Extensions    |
     |   QPACK codec   |    |    |  Datagram / Prio |
     +-----------------+    |    +------------------+
                             |
                    +--------v----------+
                    |    nhttp3-quic    |  Endpoint, TLS, streams
                    |                   |  loss, congestion, QLOG
                    +--------+----------+
                             |
                    +--------v----------+
                    |    nhttp3-core    |  VarInt, CID, errors
                    +-------------------+

Crate Responsibilities

Crate	Tests	Responsibility
`nhttp3-core`	19	VarInt, ConnectionId, shared error types
`nhttp3-quic`	134	Full QUIC transport: packets, frames, TLS, streams, flow control, recovery, endpoint I/O
`nhttp3-qpack`	25	QPACK header compression: static/dynamic tables, encoder, decoder
`nhttp3-h3`	13	HTTP/3 framing, headers, error codes
`nhttp3`	—	Umbrella re-export
`nhttp3-ffi`	5	C ABI: opaque handles, callbacks, runtime
`nhttp3-python`	—	PyO3 bindings, ASGI server, async bridge
`nhttp3-wasm`	3	WASM bindings: QPACK, frames, config

Congestion Controllers

Algorithm	Best For
NewReno (default)	General purpose, RFC 9002 compliant
CUBIC	High-bandwidth, high-latency networks
BBR	Bandwidth estimation, loss-tolerant, model-based