Every feature, one engine.
LiteSpeed Web Server Enterprise combines drop-in Apache compatibility with an event-driven core, a built-in page cache, the newest protocols and hosting-grade security — replace Apache in 15 minutes with zero downtime.
What Makes LiteSpeed Different
HTTP/2, QUIC, HTTP/3
Reliable support for new technologies before anyone else.
Explore featureCompatibleApache Drop-in Replacement
Reads Apache config files directly, supports .htaccess and WAF rules.
Explore feature03Zero-Downtime Maintenance
Graceful restarts and software updates with zero downtime.
Explore featureCoreEvent-Driven Architecture
Fewer processes, less overhead and enormous scalability.
Explore featureCacheLSCache Engine with ESI
Advanced server-level cache with hole-punching through ESI.
Explore feature06Mass Hosting Support
Dynamic vHost setup through a Redis backend or rewrite rules.
Explore featureSecurityAsynchronous ModSecurity
Processes popular ModSecurity rule sets with maximum efficiency.
Explore feature08Control Panel Compatible
Integrates with cPanel, Plesk, DirectAdmin, CyberPanel and more.
Explore feature09Server-Level reCAPTCHA
Defends against layer-7 DDoS attacks of any size.
Explore featureFirst With HTTP/3
LiteSpeed was the first to provide a production-ready implementation of HTTP/3 — the protocol previously known as HTTP-over-QUIC — and it is enabled by default in every LiteSpeed product.
Visitors get faster connection setup, no transport-level head-of-line blocking and connections that survive network changes.
- QUIC transport over UDP with built-in TLS 1.3
- Automatic fallback to HTTP/2 when UDP is blocked
- Powered by LiteSpeed's open-source LSQUIC library
$ curl --http3 -sI https://example.com | head -3# HTTP/3 200# server: LiteSpeed
Features In Detail
Click any feature for a plain-language explanation or its dedicated page.
Basic Features
15- HTTP/3→
- QUIC→
- HTTP/2→
- HTTP 1.0/1.1 compliant→
- Scripting languages: PHP, Perl, Ruby, Python, Java…→
- Server APIs: LSAPI, CGI, FCGI, AJPv13, Proxy→
- HTTPS→
- IPv4 and IPv6→
- Unlimited IP and name-based virtual hosting→
- Unlimited concurrent connections→
- Brotli compression→
- GZIP compression→
- Support for SPDY/2, 3 and 3.1→
- WebSocket proxying→
- Runs on Linux, FreeBSD, macOS, Solaris→
Security
15- Server-level reCAPTCHA against layer-7 DDoS→
- Session tickets with automatic key rotation→
- Secure WebSocket backend support→
- Blocks detected robots at the firewall level→
- Anti-DDoS for ConfigServer or iptables→
- Brute-force protection for wp-login.php→
- Built-in connection and bandwidth throttling→
- Asynchronous ModSecurity engine→
- Atomic Secured Linux & Atomicorp rules compatible→
- Anti SSL BEAST and renegotiation attack protection→
- Strict HTTP request validation→
- Denies buffer-overrun attempts→
- PHP / Ruby / CGI / FCGI / LSAPI suEXEC→
- CloudLinux CageFS compatibility→
- External application and full-server chroot→
Performance & Scalability
24- Event-driven architecture→
- Hundreds of thousands of concurrent connections→
- Ability to cache POST requests→
- HTTPS / TLS 1.3 certificate compression→
- HTTPS performance with TLS record-level optimisation→
- HTTPS / QUIC fast handshake and offload→
- Tiny memory footprint→
- sendfile()→
- Asynchronous I/O support→
- LSAPI — the best dynamic content performance→
- Unrivalled PHP suEXEC performance for shared hosting→
- Three PHP suEXEC setups for different needs→
- Static content up to 5× faster than Apache→
- Dynamic content up to 40× faster than Apache→
- HTTPS 3× faster than Apache→
- OCSP stapling→
- Built-in page caching→
- Turbocharge Magento and other apps with ESI→
- Advanced .htaccess caching→
- CloudLinux LVE compatibility→
- Increases scalability of web applications→
- Request / response buffering for applications→
- Just-in-time configuration cuts restart time→
- CPU affinity for better CPU cache use→
High Availability
04Apache Compatibility
04Ease of Use
06Advanced Features
10- Ruby / Python / Node.js apps with native configuration→
- Most up-to-date HTTP/3 implementation→
- Sandboxed environments with namespace containers→
- Run multiple PHP versions on one server→
- MS FrontPage Server Extensions→
- Geo-IP lookup→
- Stream logs to an external logger→
- Custom log formatting→
- Backend load balancing→
- mp4 / flv streaming→
Explore Feature Pages
Feature Explanations
All 70+ features explained in plain language.
Explore feature02Built-In Security
WAF, request checking, chroot and more.
Explore feature03Anti-DDoS Advances
Throttling, reCAPTCHA and bot blocking.
Explore feature04HTTP/2 Support
Multiplexing, compression and HTTPS.
Explore feature05SSL Security
Strong TLS defaults and fast patching.
Explore feature06SSL Performance
Fast handshakes and session reuse.
Explore feature07Unbelievable HTTP/2 Performance
10× faster than nginx over HTTP/2.
Explore feature08Compare LiteSpeed, Apache & nginx
Side-by-side capability table.
Explore featureMore capacity, better performance.
Replace Apache in 15 minutes with no downtime, and get intelligent page caching, comprehensive security and cutting-edge technologies like HTTP/3.