Support for HTTP/3 was added to Cloudflare and Google Chrome first, and is also enabled in Firefox. Like HTTP/2, it does not obsolesce previous major versions of the protocol. HTTP/3 uses QUIC instead of TCP for the underlying transport protocol.
It is now used by over 25% of websites and is supported by many web browsers (over 75% of users). HTTP/3, the successor to HTTP/2, was published in 2022. It is also supported by major web servers over Transport Layer Security (TLS) using an Application-Layer Protocol Negotiation (ALPN) extension where TLS 1.2 or newer is required. As of April 2023, it is used by 39% of websites and supported by almost all web browsers (over 97% of users). HTTP/2, published in 2015, provides a more efficient expression of HTTP's semantics "on the wire". Its secure variant named HTTPS is used by more than 80% of websites. It evolved (as version 1.1) in 1997 and then its specifications were updated in 1999, 2014, and 2022. HTTP/1 was finalized and fully documented (as version 1.0) in 1996. ĭevelopment of early HTTP Requests for Comments (RFCs) started a few years later in a coordinated effort by the Internet Engineering Task Force (IETF) and the World Wide Web Consortium (W3C), with work later moving to the IETF.
That version was subsequently developed, eventually becoming the public 1.0. HTTP is the foundation of data communication for the World Wide Web, where hypertext documents include hyperlinks to other resources that the user can easily access, for example by a mouse click or by tapping the screen in a web browser.ĭevelopment of HTTP was initiated by Tim Berners-Lee at CERN in 1989 and summarized in a simple document describing the behavior of a client and a server using the first HTTP version, named 0.9. The Hypertext Transfer Protocol ( HTTP) is an application layer protocol in the Internet protocol suite model for distributed, collaborative, hypermedia information systems. RFC 9204 HTTP/3: QPACK: Field Compression.RFC 8441 HTTP/2: Bootstrapping WebSockets with HTTP/2.RFC 8336 HTTP/2: The ORIGIN HTTP/2 Frame.RFC 8164 HTTP/2: Opportunistic Security for HTTP/2.RFC 7541 HTTP/2: HPACK Header Compression.
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