Overview
A web server's primary job is to display website content by storing, processing, and delivering web pages to users. A web server is a combination of software and hardware that uses HTTP (Hypertext Transfer Protocol) and other protocols to respond to client requests made over the World Wide Web. Below are the major web servers currently available:1. Apache
Apache is the most widely used web server in the world. Its main advantages include open-source code, an active development community, cross-platform support, and strong portability. Apache offers a rich set of modules. Although it is considered a heavyweight product with higher memory consumption compared to lighter alternatives, it remains a top choice for many applications.
2. Lighttpd
Lighttpd is designed for high-performance websites, offering a secure, fast, and flexible web server environment with excellent compatibility. It is known for low memory overhead, low CPU usage, high efficiency, and extensive module support. Key features include FastCGI, CGI, authentication, output compression, URL rewriting, and alias support. It is considered a lightweight web server.
3. Tomcat
Tomcat is an open-source, Java-based web application container that runs servlets and JSP web applications. It is built according to the servlet and JSP specifications and is often seen as an implementation of the Apache-Jakarta specification. While Tomcat performs better than many commercial application servers, it has weaker support for static files and high concurrency.
4. WebSphere
IBM WebSphere is a full-featured, open web application server that provides a Java-based environment for building, deploying, and managing Internet and Intranet web applications. However, its usage is less widespread compared to other popular web servers.
5. IIS
IIS (Internet Information Services) is a web service component that allows information to be published on intranets or the Internet. It includes web server, FTP server, NNTP server, and SMTP server components for web browsing, file transfer, news services, and email delivery. It provides ISAPI as a programming interface for extending web server functionality and also supports database queries and updates over the Internet.
6. Nginx
Nginx is a high-performance HTTP and reverse proxy server that can use efficient event-driven models such as epoll, kqueue, and eventport for network I/O. It can handle up to 50,000 concurrent connections with very low memory and CPU usage, and it runs with high stability.
7. Caddy
Caddy is a fast and powerful multi-platform web server written in Go. It can also function as a reverse proxy, load balancer, and API gateway. Everything is built in with no external dependencies, making Caddy easy to install and use. By default, Caddy supports HTTPS and handles SSL/TLS certificate renewal seamlessly. Its lack of dependencies improves portability across different distributions without library conflicts. Caddy is ideal for running applications written in Go and offers full support for IPv6 and HTTP/2. It also supports virtual hosts, WebSockets, URL rewriting and redirection, caching, static file serving with compression, and Markdown rendering.
8. OpenLiteSpeed
OpenLiteSpeed is an open-source web server designed for speed, simplicity, security, and optimization. It is based on the enterprise version of LiteSpeed and includes most of its core features. OpenLiteSpeed uses an event-driven, resource-efficient architecture and provides a user-friendly WebAdmin GUI for managing domains and monitoring metrics. It is optimized for running scripts such as Perl, Python, Ruby, and Java. OpenLiteSpeed supports both IPv4 and IPv6, as well as SSL/TLS, including TLS 1.0 through 1.3. In addition to acting as a web server, it can also serve as a load balancer and reverse proxy. It is available for free download under the GPLv3 license.
9. Node.js
Node.js is primarily an open-source, cross-platform server-side runtime environment for building web applications in JavaScript. It also includes an HTTP module that provides classes and functions that extend its functionality, allowing it to act as a web server as well.
10. Hiawatha
Hiawatha is a secure, lightweight, and easy-to-use Unix web server. Written in C, it is designed with a focus on speed and security. Advanced features help block SQL injection, XSS, and CSRF attacks. A dedicated monitoring tool is also available. Hiawatha is especially suitable for older or low-spec servers and embedded systems.
11. Cherokee
Cherokee is an open-source, cross-platform web server that runs on Linux, Mac OS X, Solaris, and BSD. It is highly flexible, lightweight, and fast, with a user-friendly web-based interface. Originally designed for personal development projects, it gained popularity for its simplicity. No command-line expertise is required to operate it. Cherokee supports a wide range of technologies, including traffic shaping, video streaming, virtual hosts, Apache-compatible log files, content caching, and more.
12. H2O
H2O is a next-generation open-source HTTP server written in C and released under the MIT license. The main goal behind H2O was to create a fully functional HTTP/2 implementation. It supports server push, WebSockets, TLS, latency optimization, and prioritized content delivery. Written in C, H2O delivers faster response times and lower CPU usage compared to older-generation web servers.
