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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Apache HTTP Server</span></span>
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</style><table class="infobox vevent"><tbody><tr><th colspan="2" class="infobox-above summary">Apache HTTP Server</th></tr><tr><td colspan="2" class="infobox-image logo"></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Programmer" title="Programmer">Original author(s)</a></th><td class="infobox-data"><a href="Robert_McCool" title="Robert McCool">Robert McCool</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Programmer" title="Programmer">Developer(s)</a></th><td class="infobox-data"><a href="Apache_Software_Foundation" class="mw-redirect" title="Apache Software Foundation">Apache Software Foundation</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Initial release</th><td class="infobox-data">1995<span style="display:none"> (<span class="bday dtstart published updated">1995</span>)</span><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></td></tr><tr style="display: none;"><td colspan="2" class="infobox-full-data"></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_release_life_cycle" title="Software release life cycle">Stable release</a></th><td class="infobox-data"><div style="margin:0px;">2.4.65<sup id="cite_ref-wikidata-e8b032cae63e7661b68df6722345bec16ee8871f-v20_2-0" class="reference"><a href="#cite_note-wikidata-e8b032cae63e7661b68df6722345bec16ee8871f-v20-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
/ July 23, 2025<span style="display:none"> (<span class="bday dtstart published updated">2025-07-23</span>)</span></div></td></tr><tr style="display:none"><td colspan="2">
</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Repository_(version_control)" title="Repository (version control)">Repository</a></th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">
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</style><div class="plainlist"><ul><li><span class="url"><a rel="nofollow" class="external text" href="https://svn.apache.org/viewvc/httpd/httpd/">svn<wbr>.apache<wbr>.org<wbr>/viewvc<wbr>/httpd<wbr>/httpd<wbr>/</a></span> </li></ul>
</div></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Written in</th><td class="infobox-data"><a href="C_(programming_language)" title="C (programming language)">C</a><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></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Operating_system" title="Operating system">Operating system</a></th><td class="infobox-data"><a href="Unix-like" title="Unix-like">Unix-like</a>, <a href="Microsoft_Windows" title="Microsoft Windows">Microsoft Windows</a>,<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> <a href="OpenVMS" title="OpenVMS">OpenVMS</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_categories#Categorization_approaches" title="Software categories">Type</a></th><td class="infobox-data"><a href="Web_server" title="Web server">Web server</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="Apache_License" title="Apache License">Apache-2.0</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="https://httpd.apache.org/">httpd<wbr>.apache<wbr>.org</a></span> </td></tr></tbody></table>
<p>The <b>Apache HTTP Server</b> is a <a href="Free_and_open-source_software" title="Free and open-source software">free and open-source</a> cross-platform <a href="Web_server" title="Web server">web server</a>, released under the terms of <a href="Apache_License" title="Apache License">Apache License 2.0</a>. It is developed and maintained by a community of developers under the auspices of the <a href="Apache_Software_Foundation" class="mw-redirect" title="Apache Software Foundation">Apache Software Foundation</a>.
</p><p>The vast majority of Apache HTTP Server instances run on a <a href="Linux_distribution" title="Linux distribution">Linux distribution</a>,<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> but current versions also run on <a href="Microsoft_Windows" title="Microsoft Windows">Microsoft Windows</a>,<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> <a href="OpenVMS" title="OpenVMS">OpenVMS</a>,<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> and a wide variety of <a href="Unix-like" title="Unix-like">Unix-like</a> systems. Past versions also ran on <a href="NetWare" title="NetWare">NetWare</a>, <a href="OS/2" title="OS/2">OS/2</a> and other operating systems,<sup id="cite_ref-older_8-0" class="reference"><a href="#cite_note-older-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> including ports to mainframes.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup>
</p><p>Originally based on the <a href="NCSA_HTTPd" title="NCSA HTTPd">NCSA HTTPd</a> server, development of Apache began in early 1995 after work on the NCSA code stalled.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Apache played a key role in the initial growth of the <a href="World_Wide_Web" title="World Wide Web">World Wide Web</a>,<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> quickly overtaking NCSA HTTPd as the dominant <a href="HTTP" title="HTTP">HTTP</a> server. In 2009, it became the first web server software to serve more than 100 million <a href="Website" title="Website">websites</a>.<sup id="cite_ref-100millionsites_12-0" class="reference"><a href="#cite_note-100millionsites-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup>
</p><p>As of March 2025, <a href="Netcraft" title="Netcraft">Netcraft</a> estimated that Apache served 17.83% of the million busiest websites, with the other top four being <a href="Cloudflare" title="Cloudflare">Cloudflare</a> at 22.99%, <a href="Nginx" title="Nginx">Nginx</a> at 20.11%, and <a href="Microsoft" title="Microsoft">Microsoft</a> <a href="Internet_Information_Services" title="Internet Information Services">Internet Information Services</a> at 4.16%.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> According to W3Techs' review of all web sites, in April 2025 Apache was ranked second at 26.4% and Nginx first at 33.8%, with Cloudflare Server third at 23.5%.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup>
</p>
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<div class="mw-heading mw-heading2"><h2 id="Name">Name</h2></div>
<p>According to <a href="The_Apache_Software_Foundation" title="The Apache Software Foundation">The Apache Software Foundation</a>, its name was chosen "from respect for the various <a href="Native_Americans_in_the_United_States" title="Native Americans in the United States">Native American</a> nations collectively referred to as <a href="Apache" title="Apache">Apache</a>, well-known for their superior skills in warfare strategy and their inexhaustible endurance".<sup id="cite_ref-Apache_Foundation_15-0" class="reference"><a href="#cite_note-Apache_Foundation-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> This was in a context in which it seemed that the open internet—based on free exchange of open source code—appeared to be soon subjected to a kind of conquer by proprietary software vendor <a href="Microsoft" title="Microsoft">Microsoft</a>; Apache co-creator <a href="Brian_Behlendorf" title="Brian Behlendorf">Brian Behlendorf</a>—originator of the name—saw his effort somewhat parallel that of <a href="Geronimo" title="Geronimo">Geronimo</a>, Chief of the last of the free Apache peoples.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> But it conceded that the name "also makes a cute <a href="Pun" title="Pun">pun</a> on 'a patchy <a href="Web_server" title="Web server">web server</a>'—a server made from a series of <a href="Patch_(computing)" title="Patch (computing)">patches</a>".
</p><p>There are other sources for the "patchy" software pun theory, including the project's official documentation in 1995, which stated: "Apache is a cute name which stuck. It was based on some existing code and a series of software patches, a pun on 'A PAtCHy' server."<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup>
</p><p>But in an April 2000 interview, Behlendorf asserted that the origins of Apache were not a pun, stating:<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup>
</p>
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</style><blockquote class="templatequote"><p>The name literally came out of the blue. I wish I could say that it was something fantastic, but it was out of the blue. I put it on a page and then a few months later when this project started, I pointed people to this page and said: "Hey, what do you think of that idea?" ... Someone said they liked the name and that it was a really good pun. And I was like, "A pun? What do you mean?" He said, "Well, we're building a <a href="Server_(computing)" title="Server (computing)">server</a> out of a bunch of software patches, right? So it's a patchy Web server." I went, "Oh, all right." ... When I thought of the name, no. It just sort of connoted: "Take no prisoners. Be kind of aggressive and kick some ass."
</p></blockquote>
<p>In January 2023, the US-based non-profit Natives in Tech accused the Apache Software Foundation of <a href="Cultural_appropriation" title="Cultural appropriation">cultural appropriation</a> and urged them to change the foundation's name, and consequently also the names of the software projects it hosts.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup>
</p><p>When Apache is running under <a href="Unix" title="Unix">Unix</a>, its process name is <code class="mw-highlight mw-highlight-lang-text mw-content-ltr" style="" dir="ltr">httpd</code>, which is short for "HTTP <a href="Daemon_(computing)" title="Daemon (computing)">daemon</a>".<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Feature_overview">Feature overview</h2></div>
<p>Apache supports a variety of features, many implemented as <a href="Compiler" title="Compiler">compiled</a> <a href="Modular_programming" title="Modular programming">modules</a> which extend the core functionality. These can range from <a href="Authentication" title="Authentication">authentication</a> schemes to supporting <a href="Server-side" class="mw-redirect" title="Server-side">server-side</a> programming languages such as <a href="Mod_perl" title="Mod perl">Perl</a>, <a href="Mod_python" title="Mod python">Python</a>, <a href="Tcl" title="Tcl">Tcl</a> and <a href="PHP" title="PHP">PHP</a>. Popular authentication modules include mod_access, mod_auth, mod_digest, and mod_auth_digest, the successor to mod_digest. A sample of other features include <a href="Transport_Layer_Security#SSL_1.0,_2.0,_and_3.0" title="Transport Layer Security">Secure Sockets Layer</a> and <a href="Transport_Layer_Security" title="Transport Layer Security">Transport Layer Security</a> support (<a href="Mod_ssl" title="Mod ssl">mod_ssl</a>), a <a href="Proxy_server" title="Proxy server">proxy</a> module (<a href="Mod_proxy" title="Mod proxy">mod_proxy</a>), a <a href="URL_rewriting" class="mw-redirect" title="URL rewriting">URL rewriting</a> module (mod_rewrite), custom log files (mod_log_config), and filtering support (mod_include and mod_ext_filter).
</p><p>Popular compression methods on Apache include the external extension module, mod_gzip, implemented to help with reduction of the size (weight) of web pages served over <a href="HTTP" title="HTTP">HTTP</a>. <a href="ModSecurity" title="ModSecurity">ModSecurity</a> is an open source intrusion detection and prevention engine for Web applications. Apache logs can be analyzed through a Web browser using free scripts, such as <a href="AWStats" title="AWStats">AWStats</a>/<a href="W3Perl" title="W3Perl">W3Perl</a> or Visitors.
</p><p><a href="Virtual_hosting" title="Virtual hosting">Virtual hosting</a> allows one Apache installation to serve many different <a href="Websites" class="mw-redirect" title="Websites">websites</a>. For example, one computer with one Apache installation could simultaneously serve <code>example.com</code>, <code>example.org</code>, <code>test47.test-server.example.edu</code>, etc.
</p><p>Apache features configurable error messages, <a href="Database_management_system" class="mw-redirect" title="Database management system">DBMS</a>-based authentication databases, <a href="Content_negotiation" title="Content negotiation">content negotiation</a> and supports several <a href="Graphical_user_interface" title="Graphical user interface">graphical user interfaces</a> (GUIs).
</p><p>It supports password authentication and <a href="Digital_certificate" class="mw-redirect" title="Digital certificate">digital certificate</a> authentication. Because the source code is freely available, anyone can adapt the server for specific needs, and there is a large public library of Apache add-ons.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup>
</p><p>A more detailed list of features is provided below:
</p>
<ul><li>Loadable Dynamic Modules</li>
<li>Multiple Request Processing modes (MPMs) including <a href="Event_driven_programming" class="mw-redirect" title="Event driven programming">Event-based/Async</a>, Threaded and Prefork.</li>
<li>Highly scalable (easily handles <a href="C10k_problem" title="C10k problem">more than 10,000 simultaneous connections</a>)</li>
<li>Handling of static files, index files, auto-indexing and content negotiation</li>
<li><kbd>.htaccess</kbd> per-directory configuration support<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup></li>
<li><a href="Reverse_proxy" title="Reverse proxy">Reverse proxy</a> with caching<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup>
<ul><li><a href="Load_balancing_(computing)" title="Load balancing (computing)">Load balancing</a><sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> with in-band health checks</li>
<li>Multiple load balancing mechanisms</li>
<li><a href="Fault-tolerant_design" class="mw-redirect" title="Fault-tolerant design">Fault tolerance</a> and Failover with automatic recovery</li>
<li><a href="WebSocket" title="WebSocket">WebSocket</a>, <a href="FastCGI" title="FastCGI">FastCGI</a>, <a href="Simple_Common_Gateway_Interface" title="Simple Common Gateway Interface">SCGI</a>, <a href="Apache_JServ_Protocol" title="Apache JServ Protocol">AJP</a> and <a href="UWSGI" title="UWSGI">uWSGI</a> support with caching</li>
<li>Dynamic configuration<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup></li></ul></li>
<li><a href="Transport_Layer_Security" title="Transport Layer Security">TLS/SSL</a> with <a href="Server_Name_Indication" title="Server Name Indication">SNI</a> and <a href="OCSP_stapling" title="OCSP stapling">OCSP stapling</a> support, via <a href="OpenSSL" title="OpenSSL">OpenSSL</a> or <a href="WolfSSL" title="WolfSSL">wolfSSL</a>.</li>
<li>Name- and IP address-based virtual servers</li>
<li><a href="IPv6" title="IPv6">IPv6</a>-compatible</li>
<li><a href="HTTP/2" title="HTTP/2">HTTP/2</a> support</li>
<li>Fine-grained authentication and authorization access control<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup></li>
<li><a href="Gzip" title="Gzip">gzip</a> compression and decompression</li>
<li>URL rewriting<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup></li>
<li>Headers<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> and content<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> rewriting</li>
<li>Custom logging with rotation</li>
<li>Concurrent connection limiting</li>
<li>Request processing rate limiting</li>
<li><a href="Bandwidth_throttling" title="Bandwidth throttling">Bandwidth throttling</a></li>
<li><a href="Server_Side_Includes" title="Server Side Includes">Server Side Includes</a><sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup></li>
<li><a href="IP_address" title="IP address">IP address</a>-based <a href="Geolocation" class="mw-redirect" title="Geolocation">geolocation</a></li>
<li>User and Session tracking<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup></li>
<li><a href="WebDAV" title="WebDAV">WebDAV</a></li>
<li>Embedded <a href="Perl" title="Perl">Perl</a>, <a href="PHP" title="PHP">PHP</a> and <a href="Lua_(programming_language)" class="mw-redirect" title="Lua (programming language)">Lua</a> scripting</li>
<li><a href="Common_Gateway_Interface" title="Common Gateway Interface">CGI</a> support<sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup></li>
<li><code>public_html</code> per-user web-pages<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup></li>
<li>Generic expression parser<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup></li>
<li>Real-time status views<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup></li>
<li><a href="FTP" class="mw-redirect" title="FTP">FTP</a> support (by a separate module)<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup></li></ul>
<div class="mw-heading mw-heading2"><h2 id="Performance">Performance</h2></div>
<p>Instead of implementing a single architecture, Apache provides a variety of MultiProcessing Modules (MPMs), which allow it to run in either a <a href="Process_(computing)" title="Process (computing)">process</a>-based mode, a hybrid (process and <a href="Thread_(computing)" title="Thread (computing)">thread</a>) mode, or an event-hybrid mode, in order to better match the demands of each particular infrastructure. Choice of MPM and configuration is therefore important.
</p><p>For delivering static pages, Apache 2.2 series was considered significantly slower than <a href="Nginx" title="Nginx">nginx</a> and <a href="Varnish_(software)" title="Varnish (software)">varnish</a>.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> To address this issue, the Apache developers created the Event MPM, which mixes the use of several processes and several threads per process in an <a href="Asynchrony_(computer_programming)" title="Asynchrony (computer programming)">asynchronous</a> <a href="Event_loop" title="Event loop">event-based loop</a>.<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> This architecture as implemented in the Apache 2.4 series performs at least as well as event-based web servers, according to <a href="Jim_Jagielski" title="Jim Jagielski">Jim Jagielski</a> and other independent sources.<sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> However, some independent but significantly outdated benchmarks show that it is still half as fast as nginx, e.g.<sup id="cite_ref-46" class="reference"><a href="#cite_note-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Licensing">Licensing</h2></div>
<p>The Apache HTTP Server <a href="Codebase" title="Codebase">codebase</a> was <a href="Software_relicensing" title="Software relicensing">relicensed</a> to the <a href="Apache_License" title="Apache License">Apache 2.0 License</a> (from the previous 1.1 license) in January 2004,<sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> and Apache HTTP Server 1.3.31 and 2.0.49 were the first <a href="Software_release_life_cycle" title="Software release life cycle">releases</a> using the new license.<sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup>
</p><p>The <a href="OpenBSD" title="OpenBSD">OpenBSD</a> project did not like the change and continued the use of pre-2.0 Apache versions, effectively <a href="Fork_(software_development)" title="Fork (software development)">forking</a> Apache 1.3.x for its purposes.<sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-51" class="reference"><a href="#cite_note-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> They initially replaced it with <a href="Nginx" title="Nginx">Nginx</a>, and soon after made their own replacement, OpenBSD Httpd, based on the Relayd project.<sup id="cite_ref-52" class="reference"><a href="#cite_note-52"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-53" class="reference"><a href="#cite_note-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-54" class="reference"><a href="#cite_note-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Versions">Versions</h3></div>
<p>Version 1.1:
The Apache License 1.1 was approved by the ASF in 2000: The primary change from the 1.0 license is in the 'advertising clause' (section 3 of the 1.0 license); derived products are no longer required to include attribution in their advertising materials, only in their documentation.
</p><p>Version 2.0:
The ASF adopted the Apache License 2.0 in January 2004. The stated goals of the license included making the license easier for non-ASF projects to use, improving compatibility with GPL-based software, allowing the license to be included by reference instead of listed in every file, clarifying the license on contributions, and requiring a patent license on contributions that necessarily infringe a contributor's own patents.
</p>
<div class="mw-heading mw-heading2"><h2 id="Development">Development</h2></div>
<table class="wikitable" style="float: right; margin-left: 1em;">
<caption>Versions of Apache HTTP Server
</caption>
<tbody><tr>
<th scope="col">Version
</th>
<th scope="col">Initial release
</th>
<th scope="col">Latest release
</th></tr>
<tr>
<th scope="row" class="templateVersion co swatch-unsupported" style="color: var(--color-base, #202122);" title="Unsupported" data-sort-value="1.3"><span style="display: none;">Unsupported:</span> 1.3<style data-mw-deduplicate="TemplateStyles:r1295599781">
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</th>
<td>1998-06-06<sup id="cite_ref-56" class="reference"><a href="#cite_note-56"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup>
</td>
<td>2010-02-03 (1.3.42)<sup id="cite_ref-57" class="reference"><a href="#cite_note-57"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<th scope="row" class="templateVersion co swatch-unsupported" style="color: var(--color-base, #202122);" title="Unsupported" data-sort-value="2.0"><span style="display: none;">Unsupported:</span> 2.0
</th>
<td>2002-04-06<sup id="cite_ref-58" class="reference"><a href="#cite_note-58"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup>
</td>
<td>2013-07-10 (2.0.65)<sup id="cite_ref-59" class="reference"><a href="#cite_note-59"><span class="cite-bracket">[</span>59<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<th scope="row" class="templateVersion co swatch-unsupported" style="color: var(--color-base, #202122);" title="Unsupported" data-sort-value="2.2"><span style="display: none;">Unsupported:</span> 2.2
</th>
<td>2005-12-01<sup id="cite_ref-60" class="reference"><a href="#cite_note-60"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup>
</td>
<td>2017-07-11 (2.2.34)<sup id="cite_ref-61" class="reference"><a href="#cite_note-61"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<th scope="row" class="templateVersion c swatch-latest" style="color: var(--color-base, #202122);" title="Latest version" data-sort-value="2.4"><span style="display: none;">Latest version:</span> <span style="font-weight: 600">2.4</span>
</th>
<td>2012-02-21<sup id="cite_ref-62" class="reference"><a href="#cite_note-62"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup>
</td>
<td>2025-01-23 (2.4.63)<sup id="cite_ref-63" class="reference"><a href="#cite_note-63"><span class="cite-bracket">[</span>63<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td colspan="3"><div class="templateVersion l version-legend" style=""><div style="display: none;"><span style="white-space: nowrap;"><b>Legend:</b></span></div><div style="display: flex;" class="legend-item">Unsupported</div><div style="display: none;" class="legend-item">Supported</div><div style="display: flex;" class="legend-item"><b>Latest version</b></div><div style="display: none;" class="legend-item">Preview version</div><div style="display: none;" class="legend-item">Future version</div></div>
</td></tr></tbody></table>
<p>The Apache HTTP Server Project is a collaborative software development effort aimed at creating a robust, commercial-grade, feature-rich and freely available source code implementation of an HTTP (Web) server. The project is jointly managed by a group of volunteers located around the world, using the Internet and the Web to communicate, plan, and develop the server and its related documentation. This project is part of the <a href="The_Apache_Software_Foundation" title="The Apache Software Foundation">Apache Software Foundation</a>. In addition, hundreds of users have contributed ideas, code, and documentation to the project.<sup id="cite_ref-64" class="reference"><a href="#cite_note-64"><span class="cite-bracket">[</span>64<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-65" class="reference"><a href="#cite_note-65"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-66" class="reference"><a href="#cite_note-66"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup>
</p><p>Apache 2.4 dropped support for <a href="BeOS" title="BeOS">BeOS</a>, <a href="Transaction_Processing_Facility" title="Transaction Processing Facility">TPF</a>, <a href="A/UX" title="A/UX">A/UX</a>, <a href="NeXT" title="NeXT">NeXT</a>, and <a href="Tandem_Computers" title="Tandem Computers">Tandem</a> platforms.<sup id="cite_ref-older_8-1" class="reference"><a href="#cite_note-older-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Security">Security</h2></div>
<p>Older versions of Apache were vulnerable to a <a href="Denial-of-service_attack" title="Denial-of-service attack">denial-of-service attack</a> called <a href="Slowloris_(computer_security)" class="mw-redirect" title="Slowloris (computer security)">Slowloris</a>, which creates many simultaneous partially completed requests, exhausting the server's pool of available connections.<sup id="cite_ref-67" class="reference"><a href="#cite_note-67"><span class="cite-bracket">[</span>67<span class="cite-bracket">]</span></a></sup> Since Apache 2.2.15, Apache ships the module mod_reqtimeout as the official solution supported by the developers.<sup id="cite_ref-68" class="reference"><a href="#cite_note-68"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
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<ul><li><a href=".htaccess" title=".htaccess">.htaccess</a></li>
<li><a href=".htpasswd" title=".htpasswd">.htpasswd</a></li>
<li><a href="ApacheBench" title="ApacheBench">ApacheBench</a></li>
<li><a href="Comparison_of_web_server_software" title="Comparison of web server software">Comparison of web server software</a></li>
<li><a href="IBM_HTTP_Server" class="mw-redirect" title="IBM HTTP Server">IBM HTTP Server</a></li>
<li><a href="LAMP_(software_bundle)" title="LAMP (software bundle)">LAMP (software bundle)</a></li>
<li><a href="XAMPP" title="XAMPP">XAMPP</a></li>
<li><a href="List_of_Apache_modules" title="List of Apache modules">List of Apache modules</a></li>
<li><a href="List_of_free_and_open-source_software_packages" title="List of free and open-source software packages">List of free and open-source software packages</a></li>
<li><a href="POSSE_project" title="POSSE project">POSSE project</a></li>
<li><a href="SuEXEC" title="SuEXEC">suEXEC</a></li>
<li><a href="Apache_Tomcat" title="Apache Tomcat">Apache Tomcat</a> - another web server developed by the Apache Software Foundation</li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<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">
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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://httpd.apache.org/ABOUT_APACHE.html">"About the Apache HTTP Server Project"</a>. <a href="Apache_Software_Foundation" class="mw-redirect" title="Apache Software Foundation">Apache Software Foundation</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20080607122013/http://httpd.apache.org/ABOUT_APACHE.html">Archived</a> from the original on 7 June 2008<span class="reference-accessdate">. Retrieved <span class="nowrap">2008-06-25</span></span>.</cite></span>
</li>
<li id="cite_note-wikidata-e8b032cae63e7661b68df6722345bec16ee8871f-v20-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-wikidata-e8b032cae63e7661b68df6722345bec16ee8871f-v20_2-0">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://lists.apache.org/thread/4khdo3o3nl8xhboltj6ozz758qgfcvf6">"[ANNOUNCEMENT] Apache HTTP Server 2.4.65 Released"</a>. 23 July 2025<span class="reference-accessdate">. Retrieved <span class="nowrap">24 July</span> 2025</span>.</cite></span>
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</style><div id="The_Apache_Software_Foundation253" style="font-size:114%;margin:0 4em"><a href="The_Apache_Software_Foundation" title="The Apache Software Foundation">The Apache Software Foundation</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Top-level<br>projects</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Apache_Accumulo" title="Apache Accumulo">Accumulo</a></li>
<li><a href="Apache_ActiveMQ" title="Apache ActiveMQ">ActiveMQ</a></li>
<li><a href="Apache_Airavata" title="Apache Airavata">Airavata</a></li>
<li><a href="Apache_Airflow" title="Apache Airflow">Airflow</a></li>
<li><a href="Apache_Allura" title="Apache Allura">Allura</a></li>
<li><a href="Apache_Ambari" class="mw-redirect" title="Apache Ambari">Ambari</a></li>
<li><a href="Apache_Ant" title="Apache Ant">Ant</a></li>
<li><a href="Apache_Aries" title="Apache Aries">Aries</a></li>
<li><a href="Apache_Arrow" title="Apache Arrow">Arrow</a></li>
<li><a href="Apache_Portable_Runtime" title="Apache Portable Runtime">APR</a></li>
<li><a href="Apache_Avro" title="Apache Avro">Avro</a></li>
<li><a href="Apache_Axis" title="Apache Axis">Axis</a></li>
<li><a href="Apache_Axis2" title="Apache Axis2">Axis2</a></li>
<li><a href="Apache_Beam" title="Apache Beam">Beam</a></li>
<li><a href="Apache_Bloodhound" class="mw-redirect" title="Apache Bloodhound">Bloodhound</a></li>
<li><a href="Apache_Brooklyn" title="Apache Brooklyn">Brooklyn</a></li>
<li><a href="Apache_Calcite" title="Apache Calcite">Calcite</a></li>
<li><a href="Apache_Camel" title="Apache Camel">Camel</a></li>
<li><a href="Apache_CarbonData" title="Apache CarbonData">CarbonData</a></li>
<li><a href="Apache_Cassandra" title="Apache Cassandra">Cassandra</a></li>
<li><a href="Apache_Cayenne" title="Apache Cayenne">Cayenne</a></li>
<li><a href="Apache_CloudStack" title="Apache CloudStack">CloudStack</a></li>
<li><a href="Apache_Cocoon" title="Apache Cocoon">Cocoon</a></li>
<li><a href="Apache_Cordova" title="Apache Cordova">Cordova</a></li>
<li><a href="Apache_CouchDB" title="Apache CouchDB">CouchDB</a></li>
<li><a href="Apache_cTAKES" title="Apache cTAKES">cTAKES</a></li>
<li><a href="Apache_CXF" title="Apache CXF">CXF</a></li>
<li><a href="Apache_Derby" title="Apache Derby">Derby</a></li>
<li><a href="Apache_Directory" title="Apache Directory">Directory</a></li>
<li><a href="Apache_Drill" title="Apache Drill">Drill</a></li>
<li><a href="Apache_Druid" title="Apache Druid">Druid</a></li>
<li><a href="Apache_Empire-db" title="Apache Empire-db">Empire-db</a></li>
<li><a href="Apache_Felix" title="Apache Felix">Felix</a></li>
<li><a href="Apache_Flex" title="Apache Flex">Flex</a></li>
<li><a href="Apache_Flink" title="Apache Flink">Flink</a></li>
<li><a href="Apache_Flume" class="mw-redirect" title="Apache Flume">Flume</a></li>
<li><a href="FreeMarker" title="FreeMarker">FreeMarker</a></li>
<li><a href="Apache_Geronimo" title="Apache Geronimo">Geronimo</a></li>
<li><a href="Apache_Groovy" title="Apache Groovy">Groovy</a></li>
<li><a href="Apache_Guacamole" title="Apache Guacamole">Guacamole</a></li>
<li>Gump</li>
<li><a href="Apache_Hadoop" title="Apache Hadoop">Hadoop</a></li>
<li><a href="Apache_HBase" title="Apache HBase">HBase</a></li>
<li><a href="Apache_Helix" title="Apache Helix">Helix</a></li>
<li><a href="Apache_Hive" title="Apache Hive">Hive</a></li>
<li><a href="Apache_Iceberg" title="Apache Iceberg">Iceberg</a></li>
<li><a href="Apache_Ignite" title="Apache Ignite">Ignite</a></li>
<li><a href="Apache_Impala" title="Apache Impala">Impala</a></li>
<li><a href="Apache_Jackrabbit" title="Apache Jackrabbit">Jackrabbit</a></li>
<li><a href="Apache_James" title="Apache James">James</a></li>
<li><a href="Apache_Jena" title="Apache Jena">Jena</a></li>
<li><a href="Apache_JMeter" title="Apache JMeter">JMeter</a></li>
<li><a href="Apache_Kafka" title="Apache Kafka">Kafka</a></li>
<li><a href="Apache_Kudu" title="Apache Kudu">Kudu</a></li>
<li><a href="Apache_Kylin" title="Apache Kylin">Kylin</a></li>
<li><a href="Apache_Lucene" title="Apache Lucene">Lucene</a></li>
<li><a href="Apache_Mahout" title="Apache Mahout">Mahout</a></li>
<li><a href="Apache_Maven" title="Apache Maven">Maven</a></li>
<li><a href="Apache_MINA" title="Apache MINA">MINA</a></li>
<li><a href="Mod_perl" title="Mod perl">mod_perl</a></li>
<li><a href="Apache_MyFaces" title="Apache MyFaces">MyFaces</a></li>
<li><a href="Apache_Mynewt" title="Apache Mynewt">Mynewt</a></li>
<li><a href="Apache_NiFi" title="Apache NiFi">NiFi</a></li>
<li><a href="NetBeans" title="NetBeans">NetBeans</a></li>
<li><a href="Apache_Nutch" title="Apache Nutch">Nutch</a></li>
<li><a href="NuttX" title="NuttX">NuttX</a></li>
<li><a href="Apache_OFBiz" title="Apache OFBiz">OFBiz</a></li>
<li><a href="Apache_Oozie" title="Apache Oozie">Oozie</a></li>
<li><a href="Apache_OpenEJB" title="Apache OpenEJB">OpenEJB</a></li>
<li><a href="Apache_OpenJPA" title="Apache OpenJPA">OpenJPA</a></li>
<li><a href="Apache_OpenNLP" title="Apache OpenNLP">OpenNLP</a></li>
<li><a href="Apache_OpenOffice" title="Apache OpenOffice">OрenOffice</a></li>
<li><a href="Apache_ORC" title="Apache ORC">ORC</a></li>
<li><a href="Apache_PDFBox" title="Apache PDFBox">PDFBox</a></li>
<li><a href="Apache_Parquet" title="Apache Parquet">Parquet</a></li>
<li><a href="Apache_Phoenix" title="Apache Phoenix">Phoenix</a></li>
<li><a href="Apache_POI" title="Apache POI">POI</a></li>
<li><a href="Apache_Pig" title="Apache Pig">Pig</a></li>
<li><a href="Apache_Pinot" title="Apache Pinot">Pinot</a></li>
<li><a href="Apache_Pivot" title="Apache Pivot">Pivot</a></li>
<li><a href="Apache_Qpid" title="Apache Qpid">Qpid</a></li>
<li><a href="Apache_Roller" title="Apache Roller">Roller</a></li>
<li><a href="Apache_RocketMQ" title="Apache RocketMQ">RocketMQ</a></li>
<li><a href="Apache_Samza" title="Apache Samza">Samza</a></li>
<li><a href="Apache_Shiro" title="Apache Shiro">Shiro</a></li>
<li><a href="Apache_SINGA" title="Apache SINGA">SINGA</a></li>
<li><a href="Apache_Sling" title="Apache Sling">Sling</a></li>
<li><a href="Apache_Solr" title="Apache Solr">Solr</a></li>
<li><a href="Apache_Spark" title="Apache Spark">Spark</a></li>
<li><a href="Apache_Storm" title="Apache Storm">Storm</a></li>
<li><a href="Apache_SpamAssassin" title="Apache SpamAssassin">SpamAssassin</a></li>
<li><a href="Apache_Struts" title="Apache Struts">Struts</a>
<ul><li><a href="Apache_Struts_1" title="Apache Struts 1">1</a></li></ul></li>
<li><a href="Apache_Subversion" title="Apache Subversion">Subversion</a></li>
<li><a href="Apache_Superset" title="Apache Superset">Superset</a></li>
<li><a href="Apache_SystemDS" title="Apache SystemDS">SystemDS</a></li>
<li><a href="Apache_Tapestry" title="Apache Tapestry">Tapestry</a></li>
<li><a href="Apache_Thrift" title="Apache Thrift">Thrift</a></li>
<li><a href="Apache_Tika" title="Apache Tika">Tika</a></li>
<li><a href="Apache_TinkerPop" class="mw-redirect" title="Apache TinkerPop">TinkerPop</a></li>
<li><a href="Apache_Tomcat" title="Apache Tomcat">Tomcat</a></li>
<li><a href="Apache_Trafodion" class="mw-redirect" title="Apache Trafodion">Trafodion</a></li>
<li><a href="Apache_Traffic_Server" title="Apache Traffic Server">Traffic Server</a></li>
<li><a href="UIMA" title="UIMA">UIMA</a></li>
<li><a href="Apache_Velocity" title="Apache Velocity">Velocity</a></li>
<li><a href="Apache_Wicket" title="Apache Wicket">Wicket</a></li>
<li><a href="Apache_Xalan" title="Apache Xalan">Xalan</a></li>
<li><a href="Apache_Xerces" title="Apache Xerces">Xerces</a></li>
<li><a href="Apache_XMLBeans" title="Apache XMLBeans">XMLBeans</a></li>
<li>Yetus</li>
<li><a href="Apache_ZooKeeper" title="Apache ZooKeeper">ZooKeeper</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Apache_Commons" title="Apache Commons">Commons</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Byte_Code_Engineering_Library" title="Byte Code Engineering Library">BCEL</a></li>
<li><a href="Bean_Scripting_Framework" title="Bean Scripting Framework">BSF</a></li>
<li><a href="Commons_Daemon" title="Commons Daemon">Daemon</a></li>
<li><a href="Apache_Jelly" title="Apache Jelly">Jelly</a></li>
<li><a href="Apache_Commons_Logging" title="Apache Commons Logging">Logging</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Incubator</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Apache_Taverna" title="Apache Taverna">Taverna</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other projects</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Apache_Batik" title="Apache Batik">Batik</a></li>
<li><a href="Apache_FOP_(Formatting_Objects_Processor)" class="mw-redirect" title="Apache FOP (Formatting Objects Processor)">FOP</a></li>
<li><a href="Apache_Ivy" title="Apache Ivy">Ivy</a></li>
<li><a href="Log4j" title="Log4j">Log4j</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Attic</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Apache_Apex" title="Apache Apex">Apex</a></li>
<li><a href="AxKit" title="AxKit">AxKit</a></li>
<li><a href="Apache_Beehive" title="Apache Beehive">Beehive</a></li>
<li><a href="Apache_iBATIS" title="Apache iBATIS">iBATIS</a></li>
<li><a href="Apache_Click" title="Apache Click">Click</a></li>
<li><a href="Apache_Continuum" title="Apache Continuum">Continuum</a></li>
<li><a href="Deltacloud" title="Deltacloud">Deltacloud</a></li>
<li><a href="Etch_(protocol)" title="Etch (protocol)">Etch</a></li>
<li><a href="Apache_Giraph" title="Apache Giraph">Giraph</a></li>
<li><a href="Apache_Hama" title="Apache Hama">Hama</a></li>
<li><a href="Apache_Harmony" title="Apache Harmony">Harmony</a></li>
<li><a href="Jakarta_Project" title="Jakarta Project">Jakarta</a></li>
<li><a href="Apache_Marmotta" title="Apache Marmotta">Marmotta</a></li>
<li><a href="Apache_MXNet" title="Apache MXNet">MXNet</a></li>
<li><a href="Apache_ODE" title="Apache ODE">ODE</a></li>
<li><a href="Jini" title="Jini">River</a></li>
<li><a href="Apache_Shale" title="Apache Shale">Shale</a></li>
<li><a href="Jakarta_Slide" class="mw-redirect" title="Jakarta Slide">Slide</a></li>
<li><a href="Sqoop" title="Sqoop">Sqoop</a></li>
<li><a href="Apache_Stanbol" title="Apache Stanbol">Stanbol</a></li>
<li><a href="Apache_Tuscany" class="mw-redirect" title="Apache Tuscany">Tuscany</a></li>
<li><a href="Apache_Wave" class="mw-redirect" title="Apache Wave">Wave</a></li>
<li><a href="Apache_XML" title="Apache XML">XML</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Licenses</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Apache_License" title="Apache License">Apache License</a></li></ul>
</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>
<ul><li><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> <b>Category</b></li></ul>
</div></td></tr></tbody></table></div>
<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Web_server_software112" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Web_server_software112" style="font-size:114%;margin:0 4em"><a href="Web_server" title="Web server">Web server software</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div><a href="Comparison_of_web_server_software" title="Comparison of web server software">Comparisons</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Most popular</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul>
<li><a href="Nginx" title="Nginx">Nginx</a></li>
<li><a href="Internet_Information_Services" title="Internet Information Services">IIS</a>
<ul><li><a href="Internet_Information_Services#IIS_Express" title="Internet Information Services">IIS Express</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="AOLserver" title="AOLserver">AOLserver</a></li>
<li><a href="Caddy_(web_server)" title="Caddy (web server)">Caddy</a></li>
<li><a href="Caudium_(web_server)" title="Caudium (web server)">Caudium</a></li>
<li><a href="Cherokee_(web_server)" title="Cherokee (web server)">Cherokee</a></li>
<li><a href="GlassFish" title="GlassFish">GlassFish</a></li>
<li><a href="Gunicorn" title="Gunicorn">Gunicorn</a></li>
<li><a href="H2O_(web_server)" title="H2O (web server)">H2O</a></li>
<li><a href="Hiawatha_(web_server)" title="Hiawatha (web server)">Hiawatha</a></li>
<li><a href="Oracle_iPlanet_Web_Server" title="Oracle iPlanet Web Server">iPlanet</a></li>
<li><a href="Jetty_(web_server)" title="Jetty (web server)">Jetty</a></li>
<li><a href="JEUS" title="JEUS">JEUS</a></li>
<li>Jexus</li>
<li>JOnAS</li>
<li><a href="Lighttpd" title="Lighttpd">Lighttpd</a></li>
<li><a href="LiteSpeed_Web_Server" title="LiteSpeed Web Server">LiteSpeed Web Server</a></li>
<li><a href="Mongoose_(web_server)" title="Mongoose (web server)">Mongoose</a></li>
<li><a href="Mongrel2" title="Mongrel2">Mongrel2</a></li>
<li><a href="Monkey_HTTP_Server" title="Monkey HTTP Server">Monkey</a></li>
<li><a href="NaviServer" title="NaviServer">NaviServer</a></li>
<li><a href="SAP_NetWeaver_Application_Server" title="SAP NetWeaver Application Server">NetWeaver</a></li>
<li><a href="OpenResty" title="OpenResty">OpenResty</a></li>
<li><a href="Phusion_Passenger" title="Phusion Passenger">Passenger</a></li>
<li><a href="Python_Paste" title="Python Paste">Paste</a></li>
<li><a href="POCO_C%2B%2B_Libraries" title="POCO C++ Libraries">POCO</a></li>
<li><a href="Puma_(web_server)" title="Puma (web server)">Puma</a></li>
<li><a href="Resin_(software)" title="Resin (software)">Resin</a></li>
<li><a href="Roxen_(web_server)" title="Roxen (web server)">Roxen</a></li>
<li><a href="Thttpd" title="Thttpd">thttpd</a></li>
<li><a href="Apache_Tomcat" title="Apache Tomcat">Tomcat</a></li>
<li><a href="Tornado_(web_server)" title="Tornado (web server)">Tornado</a></li>
<li><a href="Traffic_Server" class="mw-redirect" title="Traffic Server">Traffic Server</a></li>
<li><a href="Twisted_(software)" title="Twisted (software)">Twisted</a></li>
<li><a href="Oracle_WebLogic_Server" class="mw-redirect" title="Oracle WebLogic Server">WebLogic</a></li>
<li><a href="WEBrick" title="WEBrick">WEBrick</a></li>
<li><a href="IBM_WebSphere_Application_Server" title="IBM WebSphere Application Server">WebSphere</a></li>
<li><a href="WildFly" title="WildFly">WildFly</a></li>
<li><a href="Yaws_(web_server)" title="Yaws (web server)">Yaws</a></li>
<li><a href="Zope" title="Zope">Zope</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Discontinued</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Boa_(web_server)" title="Boa (web server)">Boa</a></li>
<li><a href="CERN_httpd" title="CERN httpd">CERN httpd</a></li>
<li><a href="Mongrel_(web_server)" title="Mongrel (web server)">Mongrel</a></li>
<li><a href="NCSA_HTTPd" title="NCSA HTTPd">NCSA HTTPd</a></li>
<li><a href="Xitami" title="Xitami">Xitami</a></li>
<li><a href="Zeus_Web_Server" title="Zeus Web Server">Zeus</a></li></ul>
</div></td></tr></tbody></table></div>
<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Web_interfaces26" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Web_interfaces26" style="font-size:114%;margin:0 4em"><a href="Web_API" title="Web API">Web interfaces</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td class="navbox-abovebelow" colspan="2" style="font-weight:bold"><div id="Server-side154"><a href="Server-side" class="mw-redirect" title="Server-side">Server-side</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Communication_protocol" title="Communication protocol">Protocols</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="HTTP" title="HTTP">HTTP</a>
<ul><li><a href="HTTP/2" title="HTTP/2">v2</a></li>
<li><a href="HTTP/3" title="HTTP/3">v3</a></li>
<li><a href="HTTPS" title="HTTPS">Encryption</a></li>
<li><a href="WebDAV" title="WebDAV">WebDAV</a></li></ul></li>
<li><a href="Common_Gateway_Interface" title="Common Gateway Interface">CGI</a></li>
<li><a href="Simple_Common_Gateway_Interface" title="Simple Common Gateway Interface">SCGI</a></li>
<li><a href="FastCGI" title="FastCGI">FCGI</a></li>
<li><a href="Apache_JServ_Protocol" title="Apache JServ Protocol">AJP</a></li>
<li><a href="Web_Services_for_Remote_Portlets" title="Web Services for Remote Portlets">WSRP</a></li>
<li><a href="WebSocket" title="WebSocket">WebSocket</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Server_application_programming_interface" title="Server application programming interface">Server APIs</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Netscape_Server_Application_Programming_Interface" title="Netscape Server Application Programming Interface">C NSAPI</a></li>
<li><a class="mw-selflink-fragment" href="#Feature_overview">C ASAPI</a></li>
<li><a href="Internet_Server_Application_Programming_Interface" title="Internet Server Application Programming Interface">C ISAPI</a></li>
<li><a href="Active_Server_Pages" title="Active Server Pages">COM ASP</a></li>
<li><a href="Jakarta_Servlet" title="Jakarta Servlet">Jakarta Servlet</a>
<ul><li><a href="Web_container" title="Web container">container</a></li></ul></li>
<li><a href="Open_Web_Interface_for_.NET" title="Open Web Interface for .NET">CLI OWIN</a></li>
<li><a href="HTTP_handler" title="HTTP handler">ASP.NET Handler</a></li>
<li><a href="Web_Server_Gateway_Interface" title="Web Server Gateway Interface">Python WSGI</a></li>
<li><a href="Asynchronous_Server_Gateway_Interface" title="Asynchronous Server Gateway Interface">Python ASGI</a></li>
<li><a href="Rack_(web_server_interface)" title="Rack (web server interface)">Ruby Rack</a></li>
<li><a href="JSGI" title="JSGI">JavaScript JSGI</a></li>
<li><a href="Plack_(software)#PSGI" title="Plack (software)">Perl PSGI</a></li>
<li><a href="Java_Portlet_Specification" title="Java Portlet Specification">Portlet</a>
<ul><li><a href="Java_Portlet_Specification" title="Java Portlet Specification">container</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_Apache_modules" title="List of Apache modules">Apache modules</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Server_Side_Includes" title="Server Side Includes">mod_include</a></li>
<li><a href="Mod_jk" class="mw-redirect" title="Mod jk">mod_jk</a></li>
<li><a href="Mod_lisp" title="Mod lisp">mod_lisp</a></li>
<li><a href="Mod_mono" title="Mod mono">mod_mono</a></li>
<li><a href="Mod_parrot" class="mw-redirect" title="Mod parrot">mod_parrot</a></li>
<li><a href="Mod_perl" title="Mod perl">mod_perl</a></li>
<li><a href="PHP" title="PHP">mod_php</a></li>
<li><a href="Mod_proxy" title="Mod proxy">mod_proxy</a></li>
<li><a href="Mod_python" title="Mod python">mod_python</a></li>
<li><a href="Mod_wsgi" title="Mod wsgi">mod_wsgi</a></li>
<li><a href="Mod_ruby" title="Mod ruby">mod_ruby</a></li>
<li><a href="Phusion_Passenger" title="Phusion Passenger">Phusion Passenger</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Topics</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Web_service" title="Web service">Web service</a> vs. <a href="Web_resource" title="Web resource">Web resource</a></li>
<li><a href="Web-oriented_architecture" title="Web-oriented architecture">WOA</a> vs. <a href="Resource-oriented_architecture" title="Resource-oriented architecture">ROA</a></li>
<li><a href="Open_API" title="Open API">Open API</a></li>
<li><a href="Webhook" title="Webhook">Webhook</a></li>
<li><a href="Application_server" title="Application server">Application server</a>
<ul><li><a href="List_of_application_servers" title="List of application servers">comparison</a></li></ul></li>
<li><a href="Server-side_scripting" title="Server-side scripting">Scripting</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td class="navbox-abovebelow" colspan="2" style="font-weight:bold"><div id="Client-side89"><a href="Client-side" class="mw-redirect" title="Client-side">Client-side</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Plug-in_(computing)" title="Plug-in (computing)">Browser APIs</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="NPAPI" title="NPAPI">C NPAPI</a>
<ul><li><a href="NPAPI#LiveConnect" title="NPAPI">LiveConnect</a></li>
<li><a href="NPAPI#XPConnect" title="NPAPI">XPConnect</a></li></ul></li>
<li><a href="NPAPI#NPRuntime" title="NPAPI">C NPRuntime</a></li>
<li><a href="Google_Native_Client#Pepper" title="Google Native Client">C PPAPI</a>
<ul><li><a href="Google_Native_Client" title="Google Native Client">NaCl</a></li></ul></li>
<li><a href="ActiveX" title="ActiveX">ActiveX</a></li>
<li><a href="Browser_Helper_Object" title="Browser Helper Object">BHO</a></li>
<li><a href="XAML_Browser_Applications" title="XAML Browser Applications">XBAP</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Web_API#Client_side" title="Web API">Web APIs</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="WHATWG" title="WHATWG">WHATWG</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="HTML_audio" title="HTML audio">Audio</a></li>
<li><a href="Canvas_element" title="Canvas element">Canvas</a></li>
<li><a href="Document_Object_Model" title="Document Object Model">DOM</a></li>
<li><a href="Server-sent_events" title="Server-sent events">SSE</a></li>
<li><a href="HTML_video" title="HTML video">Video</a></li>
<li><a href="WebSocket" title="WebSocket">WebSockets</a></li>
<li><a href="Web_Messaging" title="Web Messaging">Web messaging</a></li>
<li><a href="Web_storage" title="Web storage">Web storage</a></li>
<li><a href="Web_worker" title="Web worker">Web worker</a></li>
<li><a href="XMLHttpRequest" title="XMLHttpRequest">XMLHttpRequest</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="World_Wide_Web_Consortium" title="World Wide Web Consortium">W3C</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="DOM_event" title="DOM event">DOM events</a></li>
<li><a href="Encrypted_Media_Extensions" title="Encrypted Media Extensions">EME</a></li>
<li><a href="HTML5_File_API" title="HTML5 File API">File</a></li>
<li><a href="W3C_Geolocation_API" title="W3C Geolocation API">Geolocation</a></li>
<li><a href="Indexed_Database_API" title="Indexed Database API">IndexedDB</a></li>
<li><a href="Media_Source_Extensions" title="Media Source Extensions">MSE</a></li>
<li><a href="SVG" title="SVG">SVG</a></li>
<li><a href="WebAssembly" title="WebAssembly">WebAssembly</a></li>
<li><a href="WebAuthn" title="WebAuthn">WebAuthn</a></li>
<li><a href="WebGPU" title="WebGPU">WebGPU</a></li>
<li><a href="WebRTC" title="WebRTC">WebRTC</a></li>
<li><a href="WebXR" title="WebXR">WebXR</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Khronos_Group" title="Khronos Group">Khronos</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="WebCL" title="WebCL">WebCL</a></li>
<li><a href="WebGL" title="WebGL">WebGL</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Others</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Gears_(software)" title="Gears (software)">Gears</a></li>
<li><a href="Web_SQL_Database" title="Web SQL Database">Web SQL Database</a> (formerly W3C)</li>
<li><a href="WebUSB" title="WebUSB">WebUSB</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Topics</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Ajax_(programming)" title="Ajax (programming)">Ajax</a> and <a href="Remote_scripting" title="Remote scripting">Remote scripting</a> vs. <a href="Dynamic_HTML" title="Dynamic HTML">DHTML</a></li>
<li><a href="Browser_extension" title="Browser extension">Browser extension</a></li>
<li><a href="Cross-site_scripting" title="Cross-site scripting">Cross-site scripting</a> and <a href="Cross-origin_resource_sharing" title="Cross-origin resource sharing">CORS</a></li>
<li><a href="Hydration_(web_development)" title="Hydration (web development)">Hydration</a></li>
<li><a href="Mashup_(web_application_hybrid)" title="Mashup (web application hybrid)">Mashup</a></li>
<li><a href="Client-side_persistent_data" title="Client-side persistent data">Persistent data</a></li>
<li><a href="Web_IDL" title="Web IDL">Web IDL</a></li>
<li><a href="Dynamic_web_page#Client-side_scripting" title="Dynamic web page">Scripting</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td class="navbox-abovebelow" colspan="2"><div id="Related_topics14">Related topics</div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Frontend_and_backend" title="Frontend and backend">Frontend and backend</a></li>
<li><a href="Microservices" title="Microservices">Microservices</a>
<ul><li><a href="REST" title="REST">REST</a></li>
<li><a href="GraphQL" title="GraphQL">GraphQL</a></li></ul></li>
<li><a href="Push_technology" title="Push technology">Push technology</a></li>
<li><a href="Solution_stack" title="Solution stack">Solution stack</a></li>
<li><a href="Web_page" title="Web page">Web page</a>
<ul><li><a href="Static_web_page" title="Static web page">Static</a></li>
<li><a href="Dynamic_web_page" title="Dynamic web page">Dynamic</a></li></ul></li>
<li><a href="Web_standards" title="Web standards">Web standards</a></li>
<li><a href="Web_API_security" title="Web API security">Web API security</a></li>
<li><a href="Web_application" title="Web application">Web application</a>
<ul><li><a href="Rich_Internet_Application" title="Rich Internet Application">Rich</a></li>
<li><a href="Single-page_application" title="Single-page application">Single-page</a></li>
<li><a href="Progressive_web_app" title="Progressive web app">Progressive</a></li></ul></li>
<li><a href="Web_framework" title="Web framework">Web framework</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr></tbody></table></div>
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