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