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id="toc-Legality-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Server-side_software" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Server-side_software"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Server-side software</span> </div> </a> <ul id="toc-Server-side_software-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Further_reading" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Further_reading"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Further reading</span> </div> </a> <ul id="toc-Further_reading-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label 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Available in 15 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-15" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">15 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B0%D8%A7%D9%83%D8%B1%D8%A9_%D9%85%D8%AE%D8%A8%D8%A3%D8%A9_(%D9%88%D9%8A%D8%A8)" title="ذاكرة مخبأة (ويب) – Arabic" lang="ar" hreflang="ar" data-title="ذاكرة مخبأة (ويب)" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Browser-Cache" title="Browser-Cache – German" lang="de" hreflang="de" data-title="Browser-Cache" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Cach%C3%A9_web" title="Caché web – Spanish" lang="es" hreflang="es" data-title="Caché web" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AD%D8%A7%D9%81%D8%B8%D9%87_%D9%86%D9%87%D8%A7%D9%86_%D9%88%D8%A8" title="حافظه نهان وب – Persian" lang="fa" hreflang="fa" data-title="حافظه نهان وب" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Cache_web" title="Cache web – French" lang="fr" hreflang="fr" data-title="Cache web" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9B%B9_%EC%BA%90%EC%8B%9C" title="웹 캐시 – Korean" lang="ko" hreflang="ko" data-title="웹 캐시" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Web_cache" title="Web cache – Italian" lang="it" hreflang="it" data-title="Web cache" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Po%C5%9Brednik_HTTP" title="Pośrednik HTTP – Polish" lang="pl" hreflang="pl" data-title="Pośrednik HTTP" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Cache_web" title="Cache web – Portuguese" lang="pt" hreflang="pt" data-title="Cache web" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%92%D0%B5%D0%B1-%D0%BA%D1%8D%D1%88" title="Веб-кэш – Russian" lang="ru" hreflang="ru" data-title="Веб-кэш" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%92%D0%B5%D0%B1-%D0%BA%D0%B5%D1%88" title="Веб-кеш – Serbian" lang="sr" hreflang="sr" data-title="Веб-кеш" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Web_%C3%B6nbelle%C4%9Fi" title="Web önbelleği – Turkish" lang="tr" hreflang="tr" data-title="Web önbelleği" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%92%D0%B5%D0%B1%D0%BA%D0%B5%D1%88%D1%83%D0%B2%D0%B0%D0%BD%D0%BD%D1%8F" title="Вебкешування – Ukrainian" lang="uk" hreflang="uk" data-title="Вебкешування" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Web_caching" title="Web caching – Vietnamese" lang="vi" hreflang="vi" data-title="Web caching" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/Web%E7%BC%93%E5%AD%98" title="Web缓存 – Chinese" lang="zh" hreflang="zh" data-title="Web缓存" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q991293#sitelinks-wikipedia" title="Edit interlanguage links" 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</div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Appearance</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">hide</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><span class="mw-redirectedfrom">(Redirected from <a href="/w/index.php?title=Bypass_your_cache&redirect=no" class="mw-redirect" title="Bypass your cache">Bypass your cache</a>)</span></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">System for optimizing the Web</div> <p>A <b>Web cache</b> (or <b>HTTP cache</b>) is a system for optimizing the World Wide Web. It is implemented both client-side and server-side. The caching of multimedia and other files can result in less overall delay when <a href="/wiki/Web_browser" title="Web browser">browsing</a> the Web.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Parts_of_the_system">Parts of the system</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Web_cache&action=edit&section=1" title="Edit section: Parts of the system"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Forward_and_reverse">Forward and reverse</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Web_cache&action=edit&section=2" title="Edit section: Forward and reverse"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A forward cache is a cache outside the <a href="/wiki/Web_server" title="Web server">web server</a>'s network, e.g. in the client's <a href="/wiki/Web_browser" title="Web browser">web browser</a>, in an <a href="/wiki/ISP" class="mw-redirect" title="ISP">ISP</a>, or within a corporate network.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> A network-aware forward cache only caches heavily accessed items.<sup id="cite_ref-:0_4-0" class="reference"><a href="#cite_note-:0-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> A <a href="/wiki/Proxy_server" title="Proxy server">proxy server</a> sitting between the client and web server can evaluate <a href="/wiki/HTTP" title="HTTP">HTTP</a> headers and choose whether to store web content. </p><p>A reverse cache sits in front of one or more web servers, accelerating requests from the Internet and reducing peak server load. This is usually a <a href="/wiki/Content_delivery_network" title="Content delivery network">content delivery network</a> (CDN) that retains copies of web content at various points throughout a network. </p> <div class="mw-heading mw-heading3"><h3 id="HTTP_options">HTTP options</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Web_cache&action=edit&section=3" title="Edit section: HTTP options"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/HTTP" title="HTTP">Hypertext Transfer Protocol</a> (HTTP) defines three basic mechanisms for controlling caches: freshness, validation, and invalidation.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> This is specified in the header of HTTP response messages from the server. </p><p>Freshness allows a response to be used without re-checking it on the origin server, and can be controlled by both the server and the client. For example, the Expires response header gives a date when the document becomes stale, and the Cache-Control: max-age directive tells the cache how many seconds the response is fresh for. </p><p>Validation can be used to check whether a cached response is still good after it becomes stale. For example, if the response has a Last-Modified header, a cache can make a <i>conditional request</i> using the If-Modified-Since header to see if it has changed. The <a href="/wiki/HTTP_ETag" title="HTTP ETag">ETag</a> (entity tag) mechanism also allows for both strong and weak validation. </p><p>Invalidation is usually a side effect of another request that passes through the cache. For example, if a URL associated with a cached response subsequently gets a POST, PUT or DELETE request, the cached response will be invalidated. Many CDNs and manufacturers of network equipment have replaced this standard HTTP cache control with dynamic caching. </p> <div class="mw-heading mw-heading2"><h2 id="Legality">Legality</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Web_cache&action=edit&section=4" title="Edit section: Legality"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In 1998, the <a href="/wiki/Digital_Millennium_Copyright_Act" title="Digital Millennium Copyright Act">Digital Millennium Copyright Act</a> added rules to the <a href="/wiki/United_States_Code" title="United States Code">United States Code</a> (<a href="/wiki/Online_Copyright_Infringement_Liability_Limitation_Act#§_512(b)_System_Caching_Safe_Harbor" title="Online Copyright Infringement Liability Limitation Act">17 U.S.C. §: 512</a>) that exempts system operators from <a href="/wiki/Copyright" title="Copyright">copyright</a> liability for the purposes of caching. </p> <div class="mw-heading mw-heading2"><h2 id="Server-side_software">Server-side software</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Web_cache&action=edit&section=5" title="Edit section: Server-side software"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>This is a list of server-side web caching software. </p> <table style="font-size: 85%; text-align: center; width: auto;" class="sortable wikitable"> <tbody><tr> <th rowspan="2">Name </th> <th colspan="3">Operating system </th> <th rowspan="2">Forward<br />mode </th> <th rowspan="2">Reverse<br />mode </th> <th rowspan="2">License </th></tr> <tr> <th><a href="/wiki/Microsoft_Windows" title="Microsoft Windows">Windows</a> </th> <th><a href="/wiki/Unix-like" title="Unix-like">Unix-like</a> </th> <th>Other </th></tr> <tr> <th scope="row"><a href="/wiki/Apache_HTTP_Server" title="Apache HTTP Server">Apache HTTP Server</a> </th> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">OS X, Linux, Unix, FreeBSD, Solaris, Novell NetWare </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">OS/2, TPF, OpenVMS, eComStation </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td> </td> <td style="background: #9EFF9E; color:black; vertical-align: middle; text-align: center;" class="active table-active"><a href="/wiki/Apache_2.0" class="mw-redirect" title="Apache 2.0">Apache 2.0</a> </td></tr> <tr> <th scope="row"><a href="/wiki/AiScaler" title="AiScaler">aiScaler</a> Dynamic Cache Control </th> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"><a href="/wiki/Linux" title="Linux">Linux</a> </td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td> </td> <td> </td> <td style="background: #E7E7FF; color:black; vertical-align: middle; text-align: center;" class="table-proprietary"><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a> </td></tr> <tr> <th scope="row"><a href="/wiki/ApplianSys#CACHEbox" title="ApplianSys">ApplianSys CACHEbox</a> </th> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"><a href="/wiki/Linux" title="Linux">Linux</a> </td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td> </td> <td> </td> <td style="background: #E7E7FF; color:black; vertical-align: middle; text-align: center;" class="table-proprietary"><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a> </td></tr> <tr> <th scope="row"><a href="/wiki/Blue_Coat_Systems" title="Blue Coat Systems">Blue Coat</a> ProxySG </th> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#bfd; color:black; vertical-align:middle; text-align:center;" class="table-yes2">SGOS </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background: #E7E7FF; color:black; vertical-align: middle; text-align: center;" class="table-proprietary"><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a> </td></tr> <tr> <th scope="row"><a href="/wiki/Nginx" title="Nginx">Nginx</a> </th> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"><a href="/wiki/Linux" title="Linux">Linux</a>, <a href="/wiki/BSD" class="mw-redirect" title="BSD">BSD</a>, <a href="/wiki/OS_X" class="mw-redirect" title="OS X">OS X</a>, <a href="/wiki/Solaris_(operating_system)" class="mw-redirect" title="Solaris (operating system)">Solaris</a>, <a href="/wiki/AIX" class="mw-redirect" title="AIX">AIX</a>, <a href="/wiki/HP-UX" title="HP-UX">HP-UX</a> </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background: #9EFF9E; color:black; vertical-align: middle; text-align: center;" class="active table-active">2-clause <a href="/wiki/BSD_licenses" title="BSD licenses">BSD</a>-like </td></tr> <tr> <th scope="row"><a href="/wiki/Microsoft_Forefront_Threat_Management_Gateway" title="Microsoft Forefront Threat Management Gateway">Microsoft Forefront Threat Management Gateway</a> </th> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background: #E7E7FF; color:black; vertical-align: middle; text-align: center;" class="table-proprietary"><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a> </td></tr> <tr> <th scope="row"><a href="/wiki/Polipo" title="Polipo">Polipo</a> </th> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"><a href="/wiki/OS_X" class="mw-redirect" title="OS X">OS X</a>, <a href="/wiki/Linux" title="Linux">Linux</a>, <a href="/wiki/OpenWrt" title="OpenWrt">OpenWrt</a>, <a href="/wiki/FreeBSD" title="FreeBSD">FreeBSD</a> </td> <td style="background: var(--background-color-interactive, #EEE); color: var(--color-base, black); vertical-align: middle; white-space: nowrap; text-align: center;" class="table-Unknown">? </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background: #9EFF9E; color:black; vertical-align: middle; text-align: center;" class="active table-active"><a href="/wiki/MIT_License" title="MIT License">MIT License</a> </td></tr> <tr> <th scope="row"><a href="/wiki/Squid_(software)" title="Squid (software)">Squid</a> </th> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"><a href="/wiki/Linux" title="Linux">Linux</a> </td> <td style="background: var(--background-color-interactive, #EEE); color: var(--color-base, black); vertical-align: middle; white-space: nowrap; text-align: center;" class="table-Unknown">? </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background: #9EFF9E; color:black; vertical-align: middle; text-align: center;" class="active table-active"><a href="/wiki/GPL" class="mw-redirect" title="GPL">GPL</a> </td></tr> <tr> <th scope="row"><a href="/wiki/Apache_Traffic_Server" title="Apache Traffic Server">Apache Traffic Server</a> </th> <td style="background: var(--background-color-interactive, #EEE); color: var(--color-base, black); vertical-align: middle; white-space: nowrap; text-align: center;" class="table-Unknown">? </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"><a href="/wiki/Linux" title="Linux">Linux</a> </td> <td style="background: var(--background-color-interactive, #EEE); color: var(--color-base, black); vertical-align: middle; white-space: nowrap; text-align: center;" class="table-Unknown">? </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background: #9EFF9E; color:black; vertical-align: middle; text-align: center;" class="active table-active"><a href="/wiki/Apache_2.0" class="mw-redirect" title="Apache 2.0">Apache 2.0</a> </td></tr> <tr> <th scope="row">Untangle </th> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"><a href="/wiki/Linux" title="Linux">Linux</a> </td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background: #E7E7FF; color:black; vertical-align: middle; text-align: center;" class="table-proprietary"><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a> </td></tr> <tr> <th scope="row"><a href="/wiki/Varnish_(software)" title="Varnish (software)">Varnish</a> </th> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"><a href="/wiki/Linux" title="Linux">Linux</a> </td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background: #FED; color:black; vertical-align: middle; text-align: center;" class="need table-needs">Needs a VMOD </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background: #9EFF9E; color:black; vertical-align: middle; text-align: center;" class="active table-active"><a href="/wiki/BSD_licenses" title="BSD licenses">BSD</a> </td></tr> <tr> <th scope="row"><a href="/wiki/WinGate" title="WinGate">WinGate</a> </th> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background: #E7E7FF; color:black; vertical-align: middle; text-align: center;" class="table-proprietary"><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a> (Free for 8 users) </td></tr> <tr> <th scope="row">Nuster </th> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes"><a href="/wiki/Linux" title="Linux">Linux</a> </td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background: #9EFF9E; color:black; vertical-align: middle; text-align: center;" class="active table-active"><a href="/wiki/GPL" class="mw-redirect" title="GPL">GPL</a> </td></tr> <tr> <th><a href="/wiki/McAfee" title="McAfee">McAfee</a> Web Gateway </th> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#bfd; color:black; vertical-align:middle; text-align:center;" class="table-yes2">McAfee Linux Operating System </td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td> <td style="background: #E7E7FF; color:black; vertical-align: middle; text-align: center;" class="table-proprietary"><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a> </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Web_cache&action=edit&section=6" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/InterPlanetary_File_System" title="InterPlanetary File System">InterPlanetary File System</a> - makes web caches redundant</li> <li><a href="/wiki/Cache_Discovery_Protocol" title="Cache Discovery Protocol">Cache Discovery Protocol</a></li> <li><a href="/wiki/Cache_manifest_in_HTML5" title="Cache manifest in HTML5">Cache manifest in HTML5</a></li> <li><a href="/wiki/Content_delivery_network" title="Content delivery network">Content delivery network</a></li> <li><a href="/wiki/Harvest_project" title="Harvest project">Harvest project</a></li> <li><a href="/wiki/Proxy_server" title="Proxy server">Proxy server</a></li> <li><a href="/wiki/Web_accelerator" title="Web accelerator">Web accelerator</a></li> <li><a href="/wiki/Search_engine_cache" title="Search engine cache">Search engine cache</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Web_cache&action=edit&section=7" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px 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(2009). <a rel="nofollow" class="external text" href="https://onlinelibrary.wiley.com/doi/10.1002/dac.1036">"An analytical model for the performance evaluation of stack-based Web cache replacement algorithms"</a>. <i>International Journal of Communication Systems</i>. <b>23</b>: 1–22. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1002%2Fdac.1036">10.1002/dac.1036</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:46507769">46507769</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=International+Journal+of+Communication+Systems&rft.atitle=An+analytical+model+for+the+performance+evaluation+of+stack-based+Web+cache+replacement+algorithms&rft.volume=23&rft.pages=1-22&rft.date=2009&rft_id=info%3Adoi%2F10.1002%2Fdac.1036&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A46507769%23id-name%3DS2CID&rft.aulast=Messaoud&rft.aufirst=S.&rft.au=Youssef%2C+H.&rft_id=https%3A%2F%2Fonlinelibrary.wiley.com%2Fdoi%2F10.1002%2Fdac.1036&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWeb+cache" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFShinder2008" class="citation web cs1">Shinder, Thomas (2 September 2008). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110723104247/http://www.isaserver.org/tutorials/Understanding-Web-Caching-Concepts-ISA-Firewall.html">"Understanding Web Caching Concepts for the ISA Firewall"</a>. <i><a href="/wiki/ISA_Server" class="mw-redirect" title="ISA Server">ISA Server</a></i>. TechGenix Ltd. Archived from <a rel="nofollow" class="external text" href="http://www.isaserver.org/tutorials/Understanding-Web-Caching-Concepts-ISA-Firewall.html">the original</a> on 23 July 2011<span class="reference-accessdate">. Retrieved <span class="nowrap">27 February</span> 2011</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=ISA+Server&rft.atitle=Understanding+Web+Caching+Concepts+for+the+ISA+Firewall&rft.date=2008-09-02&rft.aulast=Shinder&rft.aufirst=Thomas&rft_id=http%3A%2F%2Fwww.isaserver.org%2Ftutorials%2FUnderstanding-Web-Caching-Concepts-ISA-Firewall.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWeb+cache" class="Z3988"></span></span> </li> <li id="cite_note-:0-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-:0_4-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFErmanGerberHajiaghayiPei2008" class="citation journal cs1">Erman, Jeffrey; Gerber, Alexandre; Hajiaghayi, Mohammad T.; Pei, Dan; Spatscheck, Oliver (2008). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110401145549/http://www.research.att.com/export/sites/att_labs/techdocs/TD_7LAUDD.pdf">"Network-Aware Forward Caching"</a> <span class="cs1-format">(PDF)</span>. <i><a href="/wiki/AT%26T_Labs" title="AT&T Labs">AT&T Labs</a></i>: 291–300. <a href="/wiki/CiteSeerX_(identifier)" class="mw-redirect" title="CiteSeerX (identifier)">CiteSeerX</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.159.1786">10.1.1.159.1786</a></span>. Archived from <a rel="nofollow" class="external text" href="http://www.research.att.com/export/sites/att_labs/techdocs/TD_7LAUDD.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 1 April 2011<span class="reference-accessdate">. Retrieved <span class="nowrap">11 March</span> 2019</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=AT%26T+Labs&rft.atitle=Network-Aware+Forward+Caching&rft.pages=291-300&rft.date=2008&rft_id=https%3A%2F%2Fciteseerx.ist.psu.edu%2Fviewdoc%2Fsummary%3Fdoi%3D10.1.1.159.1786%23id-name%3DCiteSeerX&rft.aulast=Erman&rft.aufirst=Jeffrey&rft.au=Gerber%2C+Alexandre&rft.au=Hajiaghayi%2C+Mohammad+T.&rft.au=Pei%2C+Dan&rft.au=Spatscheck%2C+Oliver&rft_id=http%3A%2F%2Fwww.research.att.com%2Fexport%2Fsites%2Fatt_labs%2Ftechdocs%2FTD_7LAUDD.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWeb+cache" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKellyHausenblas" class="citation web cs1">Kelly, Mike; Hausenblas, Michael. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20100710072021/http://www.ws-rest.org/files/03-Link%20Header-based%20Invalidation%20of%20Caches.pdf">"Using HTTP Link: Header for Gateway Cache Invalidation"</a> <span class="cs1-format">(PDF)</span>. <i>WS-REST</i>. p. 20. Archived from <a rel="nofollow" class="external text" href="http://ws-rest.org/files/03-Link%20Header-based%20Invalidation%20of%20Caches.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 10 July 2010<span class="reference-accessdate">. Retrieved <span class="nowrap">14 June</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=WS-REST&rft.atitle=Using+HTTP+Link%3A+Header+for+Gateway+Cache+Invalidation&rft.pages=20&rft.aulast=Kelly&rft.aufirst=Mike&rft.au=Hausenblas%2C+Michael&rft_id=http%3A%2F%2Fws-rest.org%2Ffiles%2F03-Link%2520Header-based%2520Invalidation%2520of%2520Caches.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWeb+cache" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Web_cache&action=edit&section=8" title="Edit section: Further reading"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Ari Luotonen, <i>Web Proxy Servers</i> (Prentice Hall, 1997) <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-13-680612-0" title="Special:BookSources/0-13-680612-0">0-13-680612-0</a></li> <li>Duane Wessels, <i>Web Caching</i> (O'Reilly and Associates, 2001). <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/1-56592-536-X" title="Special:BookSources/1-56592-536-X">1-56592-536-X</a></li> <li>Michael Rabinovich and Oliver Spatschak, <i>Web Caching and Replication</i> (Addison Wesley, 2001). <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-201-61570-3" title="Special:BookSources/0-201-61570-3">0-201-61570-3</a></li></ul> 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