What Is HTTP/3?
HTTP/3 is the third major version of HTTP, standardized in 2022. Unlike HTTP/2 (which uses TCP), HTTP/3 is built on QUIC (a UDP-based transport protocol developed by Google). QUIC provides faster connection establishment (0-RTT), improved multiplexing without head-of-line blocking, built-in encryption, and better performance on mobile and lossy networks.
Why HTTP/3 Matters
HTTP/3 delivers measurable performance improvements, especially for mobile users and users on unreliable connections. It eliminates TCP head-of-line blocking (where one lost packet stalls all streams), establishes connections faster, and handles network switching (WiFi to cellular) seamlessly. These improvements translate to better Core Web Vitals scores.
How to Enable HTTP/3
Enable HTTP/3 on your web server or CDN. Cloudflare, Google Cloud, and AWS CloudFront support HTTP/3. Server-side support is available in Nginx (with quiche patch), LiteSpeed, and Caddy. HTTP/3 falls back to HTTP/2 gracefully for unsupported clients.
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