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Line 1: {{Short description\|Capability that can be built into web servers and web clients}} {{HTTP}} '''HTTP compression''' is ~~refers~~a ~~to the feature~~capability that can be built into [[web server]]s and [[web client]]s to improve transfer speed and bandwidth utilization.<ref>{{cite web\|url=http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/d52ff289-94d3-4085-bc4e-24eb4f312e0e.mspx?mfr=true\|title=Using HTTP Compression (IIS 6.0)\|access-date=9 February 2010\|publisher=Microsoft Corporation}}</ref> HTTP data is [[Data compression\|compressed]] before it is sent from the server: compliant browsers will announce what methods are supported to the server before downloading the correct format; browsers that do not support compliant compression method will download uncompressed data. The most common compression schemes include [[gzip]] and [[Brotli]]; a full list of available schemes is maintained by the [[Internet Assigned Numbers Authority\|IANA]].<ref>RFC 2616, Section 3.5: "The Internet Assigned Numbers Authority (IANA) acts as a registry for content-coding value tokens."</ref> Line 49: [[Lempel–Ziv–Markov_chain_algorithm\|lzma]] – compression based on (raw) LZMA is available in Opera 20, and in elinks via a compile-time option<ref>[http://elinks.or.cz/documentation/html/manual.html-chunked/ch01s07.html#CONFIG-LZMA elinks LZMA decompression]</ref> peerdist<ref>{{cite web\|url=http://msdn.microsoft.com/en-us/library/dd304322%28v=PROT.10%29.aspx\|title=[MS-PCCRTP]: Peer Content Caching and Retrieval: Hypertext Transfer Protocol (HTTP) Extensions\|publisher=Microsoft\|access-date=19 April 2014}}</ref> – Microsoft Peer Content Caching and Retrieval [[rsync]]<ref>{{cite web \|title=rproxy: Protocol Definition for HTTP rsync Encoding \|url=https://rproxy.samba.org/doc/protocol/protocol.html \|website=rproxy.samba.org}}</ref> -– [[Delta_encoding#Delta_encoding_in_HTTP\|delta encoding in HTTP]], implemented by a pair of ''rproxy'' proxies. xpress -– Microsoft compression protocol used by Windows 8 and later for Windows Store application updates. [[LZ77_and_LZ78#LZ77\|LZ77]]-based compression optionally using a Huffman encoding.<ref>{{cite web\|url=https://msdn.microsoft.com/en-us/library/Hh554002.aspx\|title=[MS-XCA]: Xpress Compression Algorithm\|access-date=29 August 2015}}</ref> [[XZ Utils\|xz]] -– LZMA2-based content compression, supported by a non-official Firefox patch;<ref>{{cite web\|url=https://wiki.mozilla.org/LZMA2_Compression\|title=LZMA2 Compression - MozillaWiki\|access-date=18 April 2014}}</ref> and fully implemented in mget since 2013-12-31.<ref>{{cite web\|url=https://github.com/rockdaboot/mget\|title=mget GitHub project page\|website=[[GitHub]] \|access-date=6 January 2017}}</ref> ==Servers that support HTTP compression== Line 73: [[Varnish (software)\|Varnish]] – built-in. Works also with [[Edge Side Includes\|ESI]] [https://line.github.io/armeria/ Armeria] – Serving pre-compressed files<ref>{{cite web\|url=https://line.github.io/armeria/server-http-file.html#serving-pre-compressed-files\|title=Serving static files part of Armeria's documentation}}</ref> [[NaviServer]] -– built-in, dynamic and static compression *[[Caddy (web server)\|Caddy]] – built-in via [https://caddyserver.com/docs/caddyfile/directives/encode encode] Many [[content delivery network]]s also implement HTTP compression to improve speedy delivery of resources to end users.