Why it matters

HTTP/3 is the future. Understanding it enables adoption when appropriate.

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The architecture

QUIC over UDP: bypasses OS TCP stack. User-space implementation possible.

Integrated encryption: TLS 1.3 built into QUIC. Combined handshake.

QUIC + HTTP/3QUIC over UDPuser-space transportIntegrated TLS 1.3combined handshakeIndependent streamsno HOL blocking0-RTT resumption; connection migration lets client change IP without dropping session
QUIC benefits.
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How it works end to end

Streams: independent at transport layer. Loss on one stream doesn't block others.

0-RTT: after first handshake, subsequent connects can start with 0 round trips.

Connection migration: connection tied to connection ID, not IP:port. Client can change network without losing session.

Adoption: growing; Chrome, Firefox, Cloudflare, Google support.