LiteSpeed Technologies
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DOCUMENTATION

Introduction

Overview

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.

LiteSpeed Exclusive Features

  • Apache Drop-In Replacement
  • HTTP/2 Support
  • QUIC Support
  • Zero Downtime
  • Anti-DDoS Advances
  • Event-Driven Architecture

Features

  • HTTP/1.1

    • HTTP/2
    • HTTP 1.0/1.1 compliant
    • Scripting Languages: PHP, Perl, Ruby, Python, Java, etc...
    • Server APIs: LiteSpeed SAPI (LSAPI), CGI, FCGI, AJPv13, Proxy
    • HTTPS
    • IPv4 and IPv6
    • Unlimited IP and name-based virtual hosting
    • Unlimited concurrent connections
    • GZIP compression
    • Support for SPDY/2, 3, and 3.1
    • WebSocket proxying
    • Runs on Linux, FreeBSD, MacOSX, Solaris

  • Performance & Scalability

    • Event-driven architecture
    • Hundreds of thousands of concurrent connections
    • Tiny memory footprint
    • Sendfile()
    • Asynchronous I/O support
    • LiteSpeed's exclusive server API (LSAPI) delivers the best dynamic content performance
    • Unrivaled PHP suEXEC performance for shared hosting
    • Three different PHP process modes for different needs and abilities
    • Static content up to 5x faster than Apache
    • Dynamic content up to 40x faster than Apache
    • HTTPS 3x faster than Apache
    • OCSP stapling
    • Built-in page caching
    • Turbocharge Magento and other web applications with ESI support
    • Advanced .htaccess caching removes performance bottlenecks associated with .htaccess use in Apache
    • CloudLinux LVE compatibility
    • Increases scalability of web applications
    • Separation of server and web applications allows for buffering of requests and responses, leading to better handling of multiple connections
    • Just in time configuration cuts restart time
    • CPU affinity allows for greater use of CPU cache

  • Apache Compatibility

    • Reads Apache's configuration files directly
    • Drop-in Apache replacement for cPanel, Plesk, DirectAdmin, Interworx, etc.
    • Full .htaccess support
    • Compatible with Apache core modules

  • Security

    • Built-in anti-DDoS connection and bandwidth throttling
    • mod_security compatibility
    • Compatibility with Atomic Secured Linux and Atomicorp Realtime ModSecurity Rules
    • Anti SSL BEAST and renegotiation attack capabilities
    • Strict HTTP request validation
    • Denies buffer-overrun attempts
    • PHP/Ruby/CGI/FCGI/LSAPI suEXEC
    • CloudLinux CageFS compatibility
    • External application and full server chroot ability

  • High Availability

    • Apply changes with zero downtime
    • Zero downtime server software upgrade
    • Recovers from service failure instantly

  • Ease of Use

    • Control panel plugins (cPanel, DirectAdmin, and Plesk)
    • Officially supported by cPanel
    • Intuitive WebAdmin console GUI
    • Virtual host templates for easy configuration
    • Real-time service monitoring

  • Advanced Features

    • Easily run multiple versions of PHP on one server
    • MS FrontPage Server Extensions
    • Geo-IP lookup
    • Stream logs to external logger
    • Custom log formatting
    • Backend load balancing
    • mp4/flv streaming