It has been supported by Google Chrome (including Chrome for Android, and Microsoft Edge, which is based on it) since April 2020 and by Mozilla Firefox since May 2021. Because QUIC provides native multiplexing, lost packets only impact the streams where data has been lost.Īs of November 2021, the HTTP/3 protocol is still officially an Internet Draft, but is already supported by 74% of running web browsers and, according to W3Techs, 23% of the top 10 million websites. The switch to QUIC aims to fix a major problem of HTTP/2 called " head-of-line blocking": because the parallel nature of HTTP/2's multiplexing is not visible to TCP's loss recovery mechanisms, a lost or reordered packet causes all active transactions to experience a stall regardless of whether that transaction was impacted by the lost packet. HTTP/3 uses QUIC, a transport layer network protocol which uses user space congestion control over the User Datagram Protocol (UDP). Both HTTP/1.1 and HTTP/2 use TCP as their transport. The differences are in the mapping of these semantics to underlying transports. HTTP semantics are consistent across versions: the same request methods, status codes, and message fields are typically applicable to all versions. HTTP/3 runs over QUIC, which is published as RFC 9000. HTTP/3 is the third and upcoming major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web, alongside HTTP/1.1 and HTTP/2. "Hypertext Transfer Protocol Version 3 (HTTP/3)". ( November 2019) ( Learn how and when to remove this template message)īishop, Mike. Please help improve the article by providing more context for the reader. This article provides insufficient context for those unfamiliar with the subject.
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