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Modern Transport · medium

3. Modern Transport: QUIC & HTTP/3

Eliminating head-of-line blocking over UDP.

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HTTP/3 abandons TCP in favor of QUIC running over UDP. QUIC integrates TLS 1.3 encryption natively into the handshake (0-RTT/1-RTT connection setup), multiplexes streams without TCP head-of-line blocking, and supports connection migration across changing client IP addresses (e.g. WiFi to 5G cellular handoff).

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  1. 1. What underlying transport protocol does HTTP/3 / QUIC use instead of TCP?

  2. 2. What allows QUIC connections to survive when a mobile client changes from Wi-Fi to cellular data?

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