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<!DOCTYPE html> <head> <meta charset="utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> <title>LiteSpeed Web Server Users' Manual - Introduction</title> <meta name="description" content="LiteSpeed Web Server Users' Manual - Introduction." /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta name="robots" content="noindex"> <link rel="shortcut icon" href="img/favicon.ico" /> <link rel="stylesheet" type="text/css" href="css/hdoc.css"> </head> <body> <div class="pagewrapper clearfix"><aside class="sidetree ls-col-1-5"> <figure> <img src="img/lsws_logo.svg" alt="lightspeed web server logo" width="100px"/> </figure> <h2 class="ls-text-thin"> LiteSpeed Web Server <br /> <span class="current"><a href="index.html">Users' Manual</a></span> </h2> <h3 class="ls-text-muted">Version 6.3 — Rev. 4</h3> <hr/> <div> <ul> <li><a href="license.html">License Enterprise</a></li> <li><span class="current"><a href="intro.html">Introduction</a></span></li> <li><a href="install.html">Installation</a></li> <li> <a href="admin.html">Administration</a> <ul class="menu level2"> <li><a href="ServerStat_Help.html">Service Manager</a></li> <li><a href="Real_Time_Stats_Help.html">Real-Time Stats</a></li> </ul> </li> <li><a href="security.html">Security</a></li> <li> <a href="config.html">Configuration</a> <ul class="level2"> <li><a href="ServGeneral_Help.html">Server General</a></li> <li><a href="ServLog_Help.html">Server Log</a></li> <li><a href="ServTuning_Help.html">Server Tuning</a></li> <li><a href="ServSecurity_Help.html">Server Security</a></li> <li><a href="Cache_Help.html">Page Cache</a></li> <li><a href="PageSpeed_Config.html">PageSpeed Config</a></li> <li><a href="ExtApp_Help.html">External Apps</a></li> <ul class="level3"> <li><a href="External_FCGI.html">Fast CGI App</a></li> <li><a href="External_FCGI_Auth.html">Fast CGI Authorizer</a></li> <li><a href="External_LSAPI.html">LSAPI App</a></li> <li><a href="External_Servlet.html">Servlet Engine</a></li> <li><a href="External_WS.html">Web Server</a></li> <li><a href="External_PL.html">Piped logger</a></li> <li><a href="External_LB.html">Load Balancer</a></li> </ul> <li><a href="ScriptHandler_Help.html">Script Handler</a></li> <li><a href="PHP_Help.html">PHP</a></li> <li><a href="App_Server_Help.html">App Server Settings</a></li> <li><a href="Listeners_General_Help.html">Listener General</a></li> <li><a href="Listeners_SSL_Help.html">Listener SSL</a></li> <li><a href="Templates_Help.html">Virtual Host Templates</a></li> <li><a href="VirtualHosts_Help.html">Virtual Host Basic</a></li> <li><a href="VHGeneral_Help.html">Virtual Host General</a></li> <li><a href="VHSecurity_Help.html">Virtual Host Security</a></li> <li><a href="VHSSL_Help.html">Virtual Host SSL</a></li> <li> <a href="VHPageSpeed_Config.html">Virtual Host PageSpeed Config</a> </li> <li><a href="Rewrite_Help.html">Rewrite</a></li> <li><a href="Context_Help.html">Context</a></li> <ul class="level3"> <li><a href="Static_Context.html">Static Context</a></li> <li> <a href="Java_Web_App_Context.html">Java Web App Context</a> </li> <li><a href="Servlet_Context.html">Servlet Context</a></li> <li><a href="FCGI_Context.html">Fast CGI Context</a></li> <li><a href="LSAPI_Context.html">LSAPI Context</a></li> <li><a href="Proxy_Context.html">Proxy Context</a></li> <li><a href="CGI_Context.html">CGI Context</a></li> <li><a href="LB_Context.html">Load Balancer Context</a></li> <li><a href="Redirect_Context.html">Redirect Context</a></li> <li><a href="App_Server_Context.html">App Server Context</a></li> <li><a href="Rails_Context.html">Rack/Rails Context</a></li> </ul> <li><a href="VHAddOns_Help.html">Add-ons</a></li> </ul> </li> <li> <a href="webconsole.html">Web Console</a> <ul class="level2"> <li><a href="AdminGeneral_Help.html">Admin Console General</a></li> <li><a href="AdminSecurity_Help.html">Admin Console Security</a></li> <li> <a href="AdminListeners_General_Help.html"> Admin Listener General </a> </li> <li> <a href="AdminListeners_SSL_Help.html">Admin Listener SSL</a> </li> </ul> </li> </ul> </div> </aside> <article class="contentwrapper ls-col-3-5 clearfix"><div class="nav-bar ls-spacer-micro-top"><div class="prev">« <a href="license.html">EULA - Enterprise Edition</a></div><div class="center"><a href="index.html">Home</a></div><div class="next"><a href="install.html">Installation</a> »</div></div> <h1>Introduction</h1> <h3>Overview</h3> <p> LiteSpeed Web Server is an Apache-interchangeable, high performance, secure, easy-to-use web server. It can handle thousands of concurrent connections with a small memory footprint. Its security features also make it much less vulnerable to various attacks. </p> <h3>LiteSpeed Exclusive Features</h3> <ul> <li>Apache Drop-In Replacement</li> <li>HTTP/2 Support</li> <li>QUIC Support</li> <li>Zero Downtime</li> <li>Anti-DDoS Advances</li> <li>Event-Driven Architecture</li> </ul> <h3>Features</h3> <ul> <li> <p><strong>HTTP/1.1</strong></p> <ul> <li>HTTP/2</li> <li>HTTP 1.0/1.1 compliant</li> <li>Scripting Languages: PHP, Perl, Ruby, Python, Java, etc...</li> <li>Server APIs: LiteSpeed SAPI (LSAPI), CGI, FCGI, AJPv13, Proxy</li> <li>HTTPS</li> <li>IPv4 and IPv6</li> <li>Unlimited IP and name-based virtual hosting</li> <li>Unlimited concurrent connections</li> <li>GZIP compression</li> <li>Support for SPDY/2, 3, and 3.1</li> <li>WebSocket proxying</li> <li>Runs on Linux, FreeBSD, MacOSX, Solaris</li> </ul> </li> <li> <p><strong>Performance & Scalability</strong></p> <ul> <li>Event-driven architecture</li> <li>Hundreds of thousands of concurrent connections</li> <li>Tiny memory footprint</li> <li>Sendfile()</li> <li>Asynchronous I/O support</li> <li>LiteSpeed's exclusive server API (LSAPI) delivers the best dynamic content performance</li> <li>Unrivaled PHP suEXEC performance for shared hosting</li> <li>Three different PHP process modes for different needs and abilities</li> <li>Static content up to 5x faster than Apache</li> <li>Dynamic content up to 40x faster than Apache</li> <li>HTTPS 3x faster than Apache</li> <li>OCSP stapling</li> <li>Built-in page caching</li> <li>Turbocharge Magento and other web applications with ESI support</li> <li>Advanced .htaccess caching removes performance bottlenecks associated with .htaccess use in Apache</li> <li>CloudLinux LVE compatibility</li> <li>Increases scalability of web applications</li> <li> Separation of server and web applications allows for buffering of requests and responses, leading to better handling of multiple connections </li> <li>Just in time configuration cuts restart time</li> <li>CPU affinity allows for greater use of CPU cache</li> </ul> </li> <li> <p><strong>Apache Compatibility</strong></p> <ul> <li>Reads Apache's configuration files directly</li> <li>Drop-in Apache replacement for cPanel, Plesk, DirectAdmin, Interworx, etc.</li> <li>Full .htaccess support</li> <li>Compatible with Apache core modules</li> </ul> </li> <li> <p><strong>Security</strong></p> <ul> <li>Built-in anti-DDoS connection and bandwidth throttling</li> <li>mod_security compatibility</li> <li>Compatibility with Atomic Secured Linux and Atomicorp Realtime ModSecurity Rules</li> <li>Anti SSL BEAST and renegotiation attack capabilities</li> <li>Strict HTTP request validation</li> <li>Denies buffer-overrun attempts</li> <li>PHP/Ruby/CGI/FCGI/LSAPI suEXEC</li> <li>CloudLinux CageFS compatibility</li> <li>External application and full server chroot ability</li> </ul> </li> <li> <p><strong>High Availability</strong></p> <ul> <li>Apply changes with zero downtime</li> <li>Zero downtime server software upgrade</li> <li>Recovers from service failure instantly</li> </ul> </li> <li> <p><strong>Ease of Use</strong></p> <ul> <li>Control panel plugins (cPanel, DirectAdmin, and Plesk)</li> <li>Officially supported by cPanel</li> <li>Intuitive WebAdmin console GUI</li> <li>Virtual host templates for easy configuration</li> <li>Real-time service monitoring</li> </ul> </li> <li> <p><strong>Advanced Features</strong></p> <ul> <li>Easily run multiple versions of PHP on one server</li> <li>MS FrontPage Server Extensions</li> <li>Geo-IP lookup</li> <li>Stream logs to external logger</li> <li>Custom log formatting</li> <li>Backend load balancing</li> <li>mp4/flv streaming</li> </ul> </li> </ul></article><div class="ls-col-1-1"><footer class="copyright">Copyright © 2003-2020. <a href="https://www.litespeedtech.com">LiteSpeed Technologies Inc.</a> All rights reserved.</footer> </div></div> </body> </html>