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How QUICO works inside: transport, loss recovery, congestion control, the handshake.
How HTTP/3 compresses headers without reintroducing head-of-line blocking.
A small model-based congestion controller: estimate bottleneck bandwidth and minimum RTT, and size the window from their product.
QUIC never retransmits packets — it retransmits data. Here is how QUICO turns "what is missing?" into a single range operation.
RFC 9001 §4.1.1 says a client must not send 1-RTT data before the handshake is confirmed on its side. Some servers check.