HTTP/3
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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.
Related Protocols
Mentioned in Guides
HTTP/2 vs HTTP/3: What Changed and Why
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HTTP Trailers: Sending Metadata After the Body
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DNS over HTTPS (DoH) and DNS over TLS (DoT): Encrypted DNS Explained
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RFC 9110: HTTP Semantics Deep Dive
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RFC 7540: HTTP/2 Protocol Deep Dive
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RFC 9114: HTTP/3 Protocol Deep Dive
Protocol Deep Dives
QUIC Protocol: The Transport Layer Behind HTTP/3
Protocol Deep Dives
Migrating from HTTP/1.1 to HTTP/2
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Migrating from HTTP/2 to HTTP/3: QUIC Deployment Guide
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