HTTP/3
HTTP-over-QUIC — RFC 9114 (2022). QUIC är encrypted-transport over UDP port 443. Eliminerar TCP head-of-line-blocking, faster handshake (0-RTT possible). ~30% av modern HTTPS-traffic 2024.
Discovery: server announce HTTP/3-support via Alt-Svc header på HTTP/2-response, client switchar för subsequent-requests. Cloudflare, Facebook, Google fully-deployed. Nginx: HTTP/3-support sedan 1.25 (2023). Browser-support: Chrome, Firefox, Safari default-enabled. Performance-vinst varies: 5-30% improvement on lossy-mobile-networks, less på stable-fiber. UDP-blocking issues: corporate-firewalls ofta block UDP-443, fall-back-to-TCP H2. Standard för modern web-serving.