HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web, complementing the widely-deployed [HTTP/1.1] and [HTTP/2]. Unlike previous versions which relied on the well-established TCP (published in 1974), HTTP/3 uses [QUIC], a multiplexed transport protocol built on UDP. On 6 June 2022, IETF published HTTP/3 as a Proposed Standard in RFC 9114.

Overview