LiteSpeed Web Server Features Explained 2020-01-02 19:28:00 LiteSpeed Web Server is packed with features - learn what they are and what they can do for you. Feature list breakdown in 8 categories - Basic Features, Apache Compatibility, Performance and Scalability, Security, High Availability, Ease of Use, Advanced Features and CloudLinux Compatibility.

Feature Explanation

LiteSpeed Web Server is packed with features - learn what they can do for you

 Basic Features

LiteSpeed Web Server is the first commercial server to offer full HTTP/2 support. Notable HTTP/2 features include binary protocol, fully multiplexed and header compression.
QUIC (Quick UDP Internet Connections) was originally a Google effort to improve HTTP/2 by transporting it encrypted over UDP. In 2016, the IETF began working to standardize the protocol. Part of that process involved splitting QUIC into the transport protocol (QUIC) and the application protocol (HTTP/3).
LiteSpeed Web Server is the first commercial server to offer full HTTP/2 support. Notable HTTP/2 features include binary protocol, fully multiplexed and header compression.
HTTP 1.0/1.1
LiteSpeed Web Server is an HTTP 1.1 server with HTTP 1.0 backwards compatibility. Notable HTTP 1.1 features include chunked transfer encoding, basic and digest authentication, entity tags, and range/multi-range request compatibility.
Scripting languages
LiteSpeed Web Server supports dynamic content written in PHP, Perl, Ruby, Python, and Java. These web applications are run as external engines. Communication between the applications is facilitated through the use of a number of server APIs (SAPIs), including LiteSpeed's exclusive LSAPI.
Server APIs
LiteSpeed Web Server supports a number of server APIs (SAPIs) for communication between the web server and external applications. The best performing and most efficient of these is LiteSpeed's exclusive LiteSpeed SAPI (LSAPI), which can be used for PHP, Ruby, and Python external applications. LiteSpeed also supports CGI, FCGI (for PHP, Ruby, Python, and Perl applications), AJPv13 (for Java applications), and proxy functions.
LiteSpeed Web Server supports SSLv3, TLSv1.1, and TLSv1.2. In addition, LiteSpeed can be easily configured to use SNI and OCSP stapling and to adhere to PCI compliance.
IPv4 and IPv6
LiteSpeed Web Server supports both IPv4 and IPv6.
Virtual hosting
LiteSpeed Web Server allows unlimited IP- and name-based virtual hosts. LSWS Standard Edition has a limit of five virtual hosts from Apache configuration files.
Concurrent connections
LiteSpeed Web Server licenses 1-CPU and above allow unlimited concurrent connections. The Ultra VPS license has a limit of 800 concurrent connections, while the VPS license has a limit of 500 concurrent connections. LSWS Standard Edition has a limit of 150 concurrent connections. OpenLiteSpeed has no limit on concurrent connections.
Brotli compression
Brotli is a generic-purpose lossless-compression algorithm which reduces both file size and page load time. Brotli is similar to gzip, but is faster and features better compression. Brotli compression is enabled in LSWS by default.
GZIP compression
LiteSpeed Web Server's gzip compression feature allows you to save bandwidth by compressing the files sent to the client.
SPDY support
LiteSpeed Web Server supports SPDY versions 2, 3, and 3.1, and will support any new versions almost as soon as they come out.
WebSocket proxying
LiteSpeed Web Server’s WebSocket proxy feature allows you to use the ground-breaking realtime technology while controlling WebSocket connections with LiteSpeed’s performance and security features and using LSWS to serve other kinds of content on the same page.
Operating systems
LiteSpeed Web Server runs on Linux, FreeBSD, Mac OSX, and Solaris.

 Apache Compatibility

Apache configuration files
LiteSpeed Web Server has been designed to run off Apache's httpd.conf and .htaccess files. There is no re-configuration necessary when you switch to LiteSpeed. LiteSpeed Web Server uses the settings you already have, but processes them with its event-driven architecture.
Control panels
LiteSpeed Web Server works seamlessly with all control panels written for Apache. With our plugins for cPanel, Plesk, and DirectAdmin plus the plugin Interworx has developed, it is even easier to drop LSWS into your server. These plugins/extensions allow you to control many common web server functions — such as installing LSWS — directly from the panel.
Full .htaccess support
LiteSpeed Web Server reads .htaccess files automatically, but processes them using .htaccess caching. Caching .htaccess files means that LSWS does not suffer the performance drop .htaccess files cause for Apache.
Apache modules
LiteSpeed Web Server is compatible with all Apache core modules, including mod_rewrite, mod_security, mod_include, and mod_cache.

 Performance & Scalability

Event-driven architecture
The biggest difference between LiteSpeed Web Server and Apache is in the design of their architecture. Apache is process-based — it creates a new process or thread for every connection. Creating these processes requires a lot of overhead. LiteSpeed Web Server is event-driven, which means it serves all connections on a few processes, saving resources. This efficient method of serving connections means you can serve many more connections, at a much higher rate, without upgrading your hardware.
Concurrent connections
LiteSpeed Web Server's efficient event-driven architecture makes it possible for servers to serve hundreds of thousands of concurrent connections. Apache, by comparison, would run out of RAM long before it could serve so many concurrent connections.
Tiny memory footprint
LiteSpeed Web Server's event-driven architecture means it uses far less memory than Apache, leaving more hardware resources for other processes (like web applications and MySQL), and resulting in a faster, more stable server.
Sendfile() is a "zero copy" system call that can greatly reduce CPU utilization when serving very large static files.
Asynchronous I/O
Asynchronous I/O is a form of input/output processing that permits other processing to begin before a transmission has finished, cutting latency. Only Enterprise Edition supports asynchronous I/O.
LiteSpeed server API (LSAPI)
LiteSpeed's exclusive server API can be used with PHP, Ruby, and Python external applications. Its optimized coding, extra features, and native use of LiteSpeed's configurations give LiteSpeed Web Server up to 40x better performance for these web applications — better than Apache, better than Nginx.
Shared hosting PHP
LSAPI's suEXEC daemon mode is designed specifically to speed up PHP web applications in shared hosting. In suEXEC daemon mode, PHP processes are started by using a fork() system call, instead of starting a brand new PHP process. This is much faster and allows users to effectively utilize opcode caching, while preserving the separation necessary for shared hosting.
suEXEC for different needs
LiteSpeed Web Server offers three different PHP suEXEC setups for different shared hosting needs. suEXEC Worker is for hosts with limited resources who need flexibility to customize. suEXEC Daemon mode combines blazing speed with light resource usage. suEXEC ProcessGroup allows hosts with extra resources to get even better performance through per-user opcode caching.
High-performance static content
LiteSpeed Web Server's event-driven architecture allows it to handle static requests much faster than Apache — up to 10x faster at high traffic volumes.
High-performance dynamic content
LiteSpeed's exclusive server API, LSAPI, handles web applications much more efficiently than other APIs, resulting in PHP, Ruby, and Python web applications that run up to 50% faster than with Apache.
SSL acceleration
LiteSpeed Web Server uses SSL acceleration to deliver HTTPS pages up to three times faster than Apache.
OCSP stapling
OCSP stapling speeds up the SSL verification process by attaching a pre-approved certificate to the SSL handshake response. This streamlines the process and removes burdens from the client and SSL certification authorities.
LiteSpeed Web Server Enterprise licenses over 2-CPUs have LiteSpeed Cache. LSCache is full-featured caching software comparable to Varnish, but built into the software and customizable through rewrite rules, allowing for streamlined processes with supreme flexibility.
ESI support
Edge Side Includes allows you to break a page of dynamic content up into sections which can be served differently, giving you more detailed control over cache use. This allows for far greater cache use (and thus much faster service) with many web applications (like Magento and WordPress).
.htaccess caching
Using .htaccess files with Apache causes decreased performance, as Apache has to check every directory for .htaccess files. LiteSpeed Web Server uses .htaccess caching to make use of .htaccess files without the performance hit.
CloudLinux LVE compatibility
LiteSpeed Technologies enjoys a close partnership with CloudLinux, allowing for complete compatibility with this industry-leading shared hosting operating system.
Increases scalability of web applications
LiteSpeed Web Server's event-based architecture shrinks the amount of memory used by the web server software, especially at high traffic, leaving more RAM for web applications. LSAPI, LiteSpeed's exclusive server API, allows for faster application responses and request/response buffering means the server handles multiple connections to web applications more smoothly. All of this adds up to web applications that can serve more requests and scale larger on your current hardware.
Web application buffering
Instead of processing dynamic content as part of the server processes, LiteSpeed Web Server delegates requests for dynamic content to external web application processes. This frees up the server software to handle other requests while the external application is generating dynamic content. LSWS also buffers all requests and responses for or from the external applications so that external applications are not beholden to the speed of the client — the external application transfers the contents of the response to LSWS and then can start working on the next request without waiting for the client to receive the response over the network. These features mean web applications that run more smoothly in high traffic.
Just in time configuration
With just in time configuration, instead of parsing all Apache virtual host configurations at startup, the web server parses virtual host configurations the first time the vhost’s site is accessed. Inactive vhosts are not parsed until they are requested, cutting memory usage and leading to a faster startup/restart, especially on servers with many virtual hosts.
CPU affinity
CPU affinity binds a process to one or more CPUs (cores) allowing processes to make greater use of CPU cache.


Connection and bandwidth throttling
LiteSpeed Web Server has per-IP connection, request, and bandwidth throttling. With these customizable features, IPs that make too many connections or requests or ask for too much bandwidth will be blocked, stopping attackers before they overrun your server.
mod_security compatibility
LiteSpeed Web Server supports almost all mod_security features. LiteSpeed is constantly updating our mod_security compatibility to keep up with mod_security's ceaseless changes and include the most important rules. Unsupported features are generally covered by other LSWS security features, and we are open to input on which features should be highest priority.
Atomicorp support
LiteSpeed Web Server is officially supported by Atomicorp for use with Atomic Secured Linux and Atomicorp's Realtime ModSecurity Rules. Atomicorp is one of the most trusted names in server security, having the longest running, most used ModSecurity rules on the Internet.
Anti SSL BEAST and renegotiation attack capabilities
LiteSpeed's developers react quickly to Internet security issues as they arise. We offer timely updates when new attack vectors emerge, developing new features and settings to answer the worst the Internet has to offer.
HTTP request checking
LiteSpeed Web Server checks all HTTP requests. Decoded URLs containing "/." are not allowed, so that hidden files will not be accessed. Users can also set the Max Request URL Length, Max Request Header Length, and Max Request Body Length settings to help prevent DoS attacks.
Denies buffer-overrun attempts
LiteSpeed Web Server has been designed to guard against buffer-overrun attacks, with extra failsafes to prevent exploitation even if bugs are found.
LiteSpeed Web Server has a fully-functioning suEXEC mode for PHP/Ruby/CGI/FCGI web applications.
CageFS compatibility
LiteSpeed Technologies enjoys a close partnership with CloudLinux, allowing for complete compatibility with this industry-leading shared hosting operating system.
chroot ability
Change root functions allow you to place either an individual web application, virtual host, or the whole web server in a virtual root directory (sometime called a "jail") and limit access outside of that root directory. This keeps attacks that may compromise a single application, user, or the web server from affecting the rest of the system.
Brute-force protection for wp-login.php
During a brute force login attack, the attacker attempts to gain access to a website by repeatedly trying to guess a valid username and password. LSWS has a built-in WordPress protection system. It covers shared hosting WordPress environments against large-scale brute force attacks. Such attacks usually target the wp-login.php and xmlrpc.php pages via POST, and have the potential to bring down entire servers.

 High Availability

Apply changes with zero downtime
LiteSpeed Web Server's graceful restart feature allows ongoing processes to finish before exiting, while starting new processes immediately to take their place. This means new server configurations can be applied (to the new processes) without interrupting any processes.
Zero downtime server software upgrade
Software upgrades can also be applied with a graceful restart allowing old processes to finish before exiting, while new processes (with the upgrade) are spawned proactively to take their place.
Recovers from service failures instantly
LiteSpeed Web Server's auto-recovery feature automatically creates a new server process to take over when a server process exits abnormally.

 Ease of Use

Control panel plugins
LiteSpeed Technologies has developed plugins for the world's most popular hosting control panels — cPanel (WHM), Plesk, and DirectAdmin. (Interworx has also created a plugin for their control panel.) These plugins allow you to control important LSWS functions, like installation, version management, restarting LSWS, and switching between LSWS and Apache, directly from the control panel.
cPanel support
cPanel officially supports LiteSpeed Web Server through their ticket system.
WebAdmin console
LiteSpeed Technologies' WebAdmin console puts all of LiteSpeed Web Server's configurations at the tip of your mouse. This GUI makes controlling LSWS far more intuitive than other web servers.
Virtual host templates
LiteSpeed's virtual host templates make it easy to set up and maintain multiple virtual hosts. The templates can either be used to create basic virtual host setups, which you then customize individually, or to easily create and maintain numerous virtual hosts with very similar settings. We also offer virtual host template configured for certain uses, such as reverse proxy or W3 Total Cache.
Real-time statistics
LiteSpeed's Web Admin console allows you to view your server statistics as they're happening. This helps you diagnose problems and eliminate attacking IPs, as well as check on the general health of your server.

 Advanced Features

Multiple versions of PHP
LiteSpeed Web Server makes it easy to run multiple versions of PHP on one server, allowing ultimate flexibility for web applications and shared hosting providers.
MS FrontPage Server Extensions
LiteSpeed Web Server supports Microsoft FrontPage Extensions 2002 for UNIX.
Geo-IP lookup
LiteSpeed Web Server supports IP geolocation, allowing you to customize your web services based on the location of users' IP addresses.
External logger
LiteSpeed Web Server supports the use of piped loggers, allowing you to stream your logs straight to a database or to a remote server.
Custom log formatting
LiteSpeed Web Server allows you to customize the server's logging of requests using syntax compatible with Apache's mod_log_config.
Load balancing
LiteSpeed Web Server has the ability to function as a load balancer for other servers or web applications on the backend.
Video streaming
LiteSpeed Web Server supports streaming video for mp4/H.264 and flv videos.

 CloudLinux Compatibility

Lightweight Virtual Environment (LVE)
LVE is a kernel-level container-based virtualization technology, the goal of which is to make sure that no single web site can bring down your web server.
CageFS, previously known as SecureLVE, is a security extension of CloudLinux. It creates a virtualized file system and set of tools for each end user. This makes sure that each user can see only their own files and tools. The separation is preserved for shell scripts, CGI scripts, and cronjobs as well.
PHP Selector
Cloudlinux PHP Selector supports LiteSpeed Web Server LSPHP. It leverages the same PHP Selector GUI so that the user can switch between different LSPHP versions in LiteSpeed Web Server without going to the LiteSpeed Admin Console to build LSPHP separately.
Node.js Selector
Node.js is a platform that generally runs as a separate web server. LiteSpeed Web Server can be configured to proxy traffic to Node.js so that users can run Node.js applications (like Ghost) on their sites.
Python and Ruby Selector
The Python and Ruby Selector allows end users to select the specific version of Python or Ruby they need.
Checkpoint/Restore In Userspace (CRIU)
Checkpoint/Restore In Userspace, or CRIU, is an open source project which dumps all of the information of a running process to disk and restores it at the point of the dump. This improves the performance of LiteSpeed for transactions which are commonly used, and reduces the memory overhead on the server.

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Privacy Policy

Privacy Policy

LiteSpeed Technologies, Inc. (aka “LiteSpeed”) is committed to protecting your privacy. This policy ("Privacy Policy" or "Policy") explains our practices for our site, ("Site"). You can visit most pages of the Site without giving us any information about yourself, but sometimes we do need information to provide services that you request. By using this Site or any products or services provided through the Site, you expressly consent to the use and disclosure of information as described in this Privacy Policy.

LiteSpeed reserves the right to revise, modify, add, or remove provisions to this Privacy Policy at any time. If we make changes to this Privacy Policy, we will update the Effective Date to note the date of such changes. LiteSpeed encourages you to review this Privacy Policy periodically for any changes. IF YOU DO NOT AGREE WITH ANY OF THE TERMS BELOW, YOU SHOULD NOT USE THIS SITE OR THE PRODUCTS OR SERVICES OFFERED BY LITESPEED TECHNOLOGIES AT THIS SITE.

Collection of Information

Personal Information.

LiteSpeed will ask you for certain “Personal Information” when you complete registration or product information request forms on the Site, including but not limited to your name, address, telephone number, email address, and credit card information. You can always choose not to provide us with the requested information, however, you may not be able to complete the transaction or use our products or services if you do not provide the information requested.

Non-Personal Information.

LiteSpeed may collect non-personally identifiable information from you such as the type of browser you use, your operating system, the screen resolution of your browser, your ISP, your IP address, which pages you view on the Site and the time and duration of your visits to the Site (collectively, “Non-Personal Information”). LiteSpeed may associate Non-Personal Information with Personal Information if you register with the Site.

User Communications.

If you communicate with us, we may collect information relating to that communication whether it takes the form of email, fax, letter, forum posting, blog comments, testimonials or any other form of communication between you and LiteSpeed or Submitted by you to the Site (collectively, “User Communications”).

Server Information.

If you use one of our software products such as LiteSpeed Web Server or LiteSpeed Web ADC, we may collect certain information concerning such software and concerning the server upon which the software operates. This information includes: (a) the licensed or unlicensed status of the software; (b) the source from which the license for the software was obtained (i.e., LiteSpeed or a LiteSpeed affiliate); or (c) information about the server upon which the software is installed including (i) the public IP address, (ii) the operating system and (iii) the use of any virtualization technologies on such server ((a) through (c) collectively, “Server Information”). Additionally, “Server Information” may also include information collected from you by LiteSpeed in the event that you request technical support services including without limitation, IP addresses, usernames, and passwords necessary to login to SSH, the root directory of the server upon which you installed the LiteSpeed software and any affected accounts including email accounts, control panel accounts, MySQL accounts, CMS accounts and other accounts.

Use and Storage of Collected Information

LiteSpeed may use Personal Information to create and authenticate your account, to respond to your requests, to provide you with customer and technical support, or to provide you with information regarding our products, services, partners, and company. You may update your Personal Information with us at any time, but we may maintain records of any Personal Information you disclose to us indefinitely, unless otherwise requested as outlined below.

We may use User Communications in the same ways we use Personal Information. If you communicate with us for a particular purpose, we may use your User Communications for that purpose. For example, if you contact us for technical support, we may use your communications to provide technical support to you. We may maintain records of User Communications you transmit to us indefinitely, unless otherwise requested as outlined below.

LiteSpeed may use Non-Personal Information to maintain, evaluate, improve and provide our Site, the Services and any other LiteSpeed products and services. We may retain Non-Personal Information indefinitely.

We may use Server Information to provide you with technical support services and to maintain, evaluate, improve and provide LiteSpeed products and services. We may also use such information to investigate unlicensed (and therefore unauthorized) uses of our software. LiteSpeed may maintain Server Information indefinitely, with the exception of usernames, passwords, and other login information given in connection with support service requests. Such login information will be purged when the ticket is closed.

Disclosure of Collected Information

LiteSpeed will only disclose Personal Information to third parties if acting under a good faith belief that such action is necessary, including but not limited to: (a) to resolve disputes, investigate problems, or comply with laws or regulations; (b) to enforce our Terms of Service; (c) to protect and defend the rights, property, or safety of our company or our users; or (d) in the event of a merger, acquisition or sale of all or substantially all LiteSpeed assets. Other than this limited activity, we do not share, sell, or rent any personal information to third parties.

You will receive notice in the form of modifications to this Policy when information about you might go to third parties other than as described in this Policy, and you always have the opportunity to contact us as set forth below if you do not wish your information to go to third parties.

LiteSpeed cannot be responsible for protecting your information if you share such information in publicly available sections of the Site such as the user forums, blog comments, or testimonials section. You should use your own judgment in disclosing this information on the Site.

Use of Cookies

“Cookies” are small pieces of information that your browser stores on your computer on behalf of a website that you have visited. Cookies may be used in order to complete transactions on our site. You can always choose not to accept cookies with the settings of your web browser, however, you may not be able to complete these transactions if you do not accept cookies.

Security of Personal Information

We use reasonable security methods to protect your personal information from unauthorized access, use or disclosure. No data transmission over the Internet or any wireless network can be guaranteed to be perfectly secure. While we try to protect your personal information, we cannot guarantee the security of any information you transmit to us, and you do so at your own risk.

LiteSpeed uses industry-standard SSL-encryption to protect sensitive data.

In the event that LiteSpeed becomes aware of a security breach, unauthorized disclosure or inadvertent disclosure concerning your information, you agree that LiteSpeed may notify you of such an event using the Personal Information previously provided.

You are responsible for maintaining your account’s security.

GDPR Statement

LiteSpeed Technologies values your users’ privacy. Although our software does not directly collect any personally identifiable information from visitors to your site, LiteSpeed may still be considered a data processor, as user information may be temporarily cached and/or logged, as outlined in this document.


LiteSpeed Web Server, OpenLiteSpeed, LiteSpeed Web ADC, and related software may record IP addresses as a part of normal logging. An access log and an error log may record visitor IP addresses and URL visited. The logs are stored locally on the system where LiteSpeed server software is installed and are not transferred to or accessed by LiteSpeed employees in any way, except as necessary in providing routine technical support if you request it. This logging may be turned off through configuration. It is up to individual server administrators to come up with their own schedule for removing such logs from the file system.

Cache Solutions

Our cache plugins potentially store a duplicate copy of every web page on display on your site. The pages are stored locally on the system where LiteSpeed server software is installed and are not transferred to or accessed by LiteSpeed employees in any way, except as necessary in providing routine technical support if you request it. All cache files are temporary, and may easily be purged before their natural expiration, if necessary, via a Purge All command. It is up to individual site administrators to come up with their own cache expiration rules.

LSCache for WordPress

In addition to caching, our WordPress plugin has an Image Optimization feature. When optimization is requested, images are transmitted to a remote LiteSpeed server, processed, and then transmitted back for use on your site. LiteSpeed keeps copies of optimized images for 7 days (in case of network stability issues) and then permanently deletes them.

Similarly, the WordPress plugin has a Reporting feature whereby a site owner can transmit an environment report to our server so that we may better provide technical support.

Neither of these features collects any visitor data. Only server and site data is involved.

Support Services

Sometimes, when you request technical support, LiteSpeed may ask for login credentials to various areas of your site. You may refuse to share such credentials, however refusal may impact LiteSpeed’s ability to provide the requested support services.

Upon completion of a support ticket, LiteSpeed immediately deletes all login credentials you may have shared.

Any user data encountered by LiteSpeed is kept strictly confidential. We never provide your support ticket information to any third party without your explicit consent.

Contact Us

If you would like to update information that you have voluntarily provided to us, stop receiving information from us, or exercise any of the rights granted to you under Privacy Laws, including the EU’s General Data Protection Regulation, please e-mail