HTTP/2 (originally named HTTP/2.0) is a major revision of the HTTP network protocol used by the World Wide Web. It was derived from the earlier experimental SPDY protocol, originally developed by Google. HTTP/2 was developed by the HTTP Working Group (also called httpbis, where "bis" means "second") of the Internet Engineering Task Force (IETF). HTTP/2 is the first new version of HTTP since HTTP 1.1, which was standardized in RFC 2068 in 1997. The Working Group presented HTTP/2 to the Internet Engineering Steering Group (IESG) for consideration as a Proposed Standard in December 2014, and IESG approved it to publish as Proposed Standard on February 17, 2015 (and was updated in Feb. 2020 in regard to TLS 1.3). The HTTP/2 specification was published as RFC 7540 on May 14, 2015.The standardization effort was supported by Chrome, Opera, Firefox, Internet Explorer 11, Safari, Amazon Silk, and Edge browsers. Most major browsers had added HTTP/2 support by the end of 2015. About 98% of web browsers used have the capability, while according to W3Techs, as of August 2020, 47% of the top 10 million websites supported HTTP/2.Its proposed successor is HTTP/3, a major revision that builds on the concepts established by HTTP/2. Support for HTTP/3 was added to Chrome in September 2019 (and Cloudflare has also added support for it), and while HTTP/3 is not yet on by default in any browser, in 2020, HTTP/3 has non-default support in stable versions of Chrome and Firefox and can be enabled.

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