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http wg led by dave raggett was constituted with the aim to standardize and expand the protocol with extended operations extended negotiation richer meta information tied with a security protocol which became more efficient by adding additional methods and header fields 47 48 the http wg planned to revise and publish new versions of the protocol as http 1 0 and http 1 1 within 1995 but because of the many revisions that timeline lasted much more than one year 49 the http wg planned also to specify a far future version of http called http ng http next generation that would have solved all remaining problems of previous versions related to performances low latency responses etc but this work started only a few years later and it was never completed http 1 0 edit in may 1996 rfc 1945 3 was published as a final http 1 0 revision of what had been used in previous 4 years as a pre standard http 1 0 draft which was already used by many web browsers and web servers in early 1996 developers started to even include unofficial extensions of the http 1 0 protocol i e keep alive connections etc into their products by using drafts of the upcoming http 1 1 specifications 20 http 1 1 edit since early 1996 major web browsers and web server developers also started to implement new features specified by pre standard http 1 1 drafts specifications end user adoption of the new versions of browsers and servers was rapid in march 1996 one web hosting company reported that over 40 of browsers in use on the internet used the new http 1 1 header host to enable virtual hosting and that by june 1996 65 of all browsers accessing their servers were pre standard http 1 1 compliant 50 in january 1997 rfc 2068 51 was officially released as http 1 1 specifications in june 1999 rfc 2616 34 was released to include all improvements and updates based on previous obsolete http 1 1 specifications w3c http ng working group edit resuming the old 1995 plan of previous http working group in 1997 an http ng working group was formed to develop a new http protocol named http ng http new generation a few proposals drafts were produced for the new protocol to use multiplexing of http transactions inside a single tcp ip connection but in 1999 the group stopped its activity passing the technical problems to ietf 52 ietf http working group restarted edit in 2007 the ietf http working group http wg bis or httpbis was restarted firstly to revise and clarify previous http 1 1 specifications and secondly to write and refine future http 2 specifications named httpbis 53 54 spdy edit main article spdy in 2009 google announced spdy a binary protocol they developed to speed up web traffic between browsers and servers in many tests using spdy was indeed faster than using http 1 1 spdy was integrated into google s chromium and then into other major web browsers 55 some of the ideas about multiplexing http streams over a single tcp connection were taken from various sources including the work of w3c http ng working group http 2 edit main article http 2 in 2012 http working group httpbis announced the need for a new protocol initially considering aspects of spdy 56 57 and eventually deciding to derive the new protocol from spdy 58 in may 2015 http 2 was published as rfc 7540 59 the protocol was quickly adopted by web browsers already supporting spdy and more slowly by web servers 2014 updates to http 1 1 edit in june 2014 the http working group released an updated six part http 1 1 specification obsoleting rfc 2616 34 rfc 7230 hypertext transfer protocol http 1 1 message syntax and routing 60 obsolete rfc 7231 hypertext transfer protocol http 1 1 semantics and content 61 obsolete rfc 7232 hypertext transfer protocol http 1 1 conditional requests 62 obsolete rfc 7233 hypertext transfer protocol http 1 1 range requests 63 obsolete rfc 7234 hypertext transfer protocol http 1 1 caching 64 obsolete rfc 7235 hypertext transfer protocol http 1 1 authentication 65 obsolete http 0 9 deprecation edit in 2014 http 0 9 was deprecated for servers supporting version http 1 1 and higher 60 appendix a since http 0 9 did not support header fields in a request there is no mechanism for it to support name based virtual hosts selection of resource by inspection of the host header field any server that implements name based virtual hosts ought to disable support for http 0 9 most requests that appear to be http 0 9 are in fact badly constructed http 1 x requests caused by a client failing to properly encode the request target since 2016 many product managers and developers of user agents browsers etc and web servers have begun planning to gradually deprecate and dismiss support for http 0 9 protocol mainly for the following reasons 66 it is so simple that an rfc document was never written there is only the original document 42 it has no http headers and lacks many other features that nowadays are required for minimal security reasons it has not been widespread since 1999 2000 because of http 1 0 and http 1 1 and is commonly used only by some very old network hardware i e routers etc as of 2022 http 0 9 support has not been officially completely deprecated and is still present in many web servers and browsers for server responses only even if usually disabled it is unclear how long it will take to decommission http 0 9 http 3 edit main article http 3 in 2020 the first drafts of http 3 were published and major web browsers and web servers started to adopt it on 6 june 2022 ietf standardized http 3 as rfc 9114 67 updates and refactoring in 2022 edit in june 2022 rfc documents were published that deprecated many of the previous documents and introducing a few minor changes and a refactoring of http semantics description into a separate document rfc 9110 http semantics 18 internet standard 97 rfc 9111 http caching 68 internet standard 98 rfc 9112 http 1 1 4 internet standard 99 rfc 9113 http 2 6 proposed standard rfc 9114 http 3 67 proposed standard see also the section above rfc 9204 qpack field compression for http 3 69 proposed standard rfc 9218 extensible prioritization scheme for http 70 proposed standard see also edit comparison of file transfer protocols constrained application protocol specialized internet application protocol content negotiation serving multiple documents at the same uri digest access authentication method of negotiating credentials between web server and browser interplanetary file system content addressable peer to peer hypermedia distribution protocol http compression capability that can be built into web servers and web clients representational state transfer architectural style for client server applications pages displaying short descriptions of redirect targets variant object web cache system for optimizing the web websocket computer network protocol wireless application protocol deprecated technical standard for data access over a cellular network notes edit in practice these streams are used as multiple tcp ip sub connections to multiplex concurrent requests responses thus greatly reducing the number of real tcp ip connections on server side from 2 8 per client to 1 and allowing many more clients to be served at once since late 1996 some developers of popular http 1 0 browsers and servers specially those who had planned support for http 1 1 too started to deploy as an unofficial extension a sort of keep alive mechanism by using new http headers in order to keep the tcp ip connection open for more than a request response pair and so to speed up the exchange of multiple requests responses 20 references edit 1 2 3 fielding roy t nottingham mark reschke julian june 2022 http semantics report internet engineering task force archived from the original on 2026 04 16 t berners lee r fielding l masinter january 2005 uniform resource identifier uri generic syntax network working group doi 10 17487 rfc3986 std 66 rfc 3986 internet standard 66 obsoletes rfc 2732 2396 and 1808 updated by rfc 6874 7320 and 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