HTTP/2 and HTTP/3
type: TechArticle
description: Serve over HTTP/2 at minimum and HTTP/3 where you can. Multiplexing eliminates head-of-line blocking; QUIC removes TCP handshake delays.
language: en
is part of: Web Specification Studio
author: Web Specification Studio
publisher: Web Specification Studio
license: https://creativecommons.org/licenses/by/4.0/
date modified: 2026-06-20T00:00:00.000Z
citation: RFC 9114 — HTTP/3
  type: CreativeWork
  publisher: IETF
citation: RFC 9113 — HTTP/2
  type: CreativeWork
  publisher: IETF
citation: MDN — Evolution of HTTP
  type: CreativeWork
  publisher: MDN
citation: MDN — Alt-Svc
  type: CreativeWork
  publisher: MDN

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Web Specification Studio
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breadcrumb
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item list element: Home
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  position: 1
  item: https://webspecification.com/
item list element: Spec
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  item: https://webspecification.com/spec/
item list element: Performance
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  position: 3
  item: https://webspecification.com/spec/performance/
item list element: HTTP/2 and HTTP/3
  type: ListItem
  position: 4
  item: https://webspecification.com/spec/performance/http3/