HTTP/3

The third major version of HTTP, standardized in RFC 9114, built on QUIC instead of TCP. QUIC provides built-in encryption (TLS 1.3), zero-RTT connection establishment, and eliminates TCP head-of-line blocking at the transport layer. HTTP/3 uses the same semantics as HTTP/2 but replaces the TCP+TLS stack with UDP-based QUIC. Adoption is growing rapidly with support from major CDNs and browsers.