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HTTP/3 | Glossary | Sitecheck

HTTP/3 is the latest major version of the HTTP protocol, built on top of QUIC (a UDP-based transport) instead of TCP. QUIC eliminates "head-of-line blocking" — a limitation in HTTP/2 where a single lost packet stalls all other requests on the same connection.

Why it matters: HTTP/3 improves load times and Core Web Vitals especially on mobile networks or in high-latency environments like international users.

Quick tips:

Major CDNs (Cloudflare, Fastly, Google Cloud CDN) support HTTP/3 — enable it in their dashboard settings.
HTTP/3 requires HTTPS with TLS 1.3.
Browsers negotiate the best supported version automatically, so HTTP/3 is backward-compatible with older clients.