HTTP/2 vs HTTP/3: What Changed and Why It Matters

HTTP/2 vs HTTP/3 comparison: multiplexing, header compression, QUIC protocol, connection migration, and performance benefits.

Key Improvements

• HTTP/2: Multiplexing (multiple requests over one TCP connection), header compression (HPACK), server push
• HTTP/3: QUIC protocol (UDP-based), no head-of-line blocking, faster connection setup (0-RTT), connection migration (survives network changes)

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