Cowboy
Cowboy is the ultimate server for the modern Web with support for Websocket, HTTP/2 and REST. Cowboy is a small, fast and modern HTTP server for Erlang/OTP. Cowboy aims to provide a complete modern Web stack. This includes HTTP/1.1, HTTP/2, WebSocket, server-sent events and Webmachine-based REST. Cowboy comes with functions for introspection and tracing, enabling developers to know precisely what is happening at any time. Its modular design also easily enables developers to add instrumentation. Cowboy is a high-quality project. It has a small code base, is very efficient (both in latency and memory use) and can easily be embedded in another application. Cowboy is clean Erlang code. It includes hundreds of tests and its code is fully compliant with the Dialyzer. It is also well documented and features a function reference, a user guide and numerous tutorials. Knowledge of the HTTP protocol is recommended but not required, as it will be detailed throughout the guide.
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LiteSpeed Web Server
Our lightweight Apache alternative conserves resources without sacrificing performance, security, compatibility, or convenience. Double the maximum capacity of your current Apache servers with LiteSpeed Web Server's streamlined event-driven architecture, capable of handling thousands of concurrent clients with minimal memory consumption and CPU usage. Protect your servers with already familiar ModSecurity rules while also taking advantage of a host of built-in anti-DDoS features, such as bandwidth and connection throttling. Conserve capital by reducing the number of servers needed to support your growing hosting business or online application. Reduce complexity by eliminating the need for an HTTPS reverse proxy or additional 3rd party caching layers. LiteSpeed Web Server is compatible with all popular Apache features including its Rewrite Engine and ModSecurity, and can load Apache configuration files directly.
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Abyss Web Server
Abyss Web Server is a compact web server available for Windows, macOS, and Linux operating systems. Despite its small footprint, it supports HTTP/2, secure SSL/TLS connections (HTTPS), automated provisioning and renewal of free certificates from Let's Encrypt® (ACME v2), IPv6, on-the-fly HTTP compression, dynamic content generation through CGI/FastCGI scripts, ISAPI extensions, native ASP.NET, HTTP/HTTPS/WebSocket reverse proxying, eXtended Side Includes (XSSI), custom error pages, password protection, IP address control, anti-leeching, bandwidth throttling, and log rotation. It also features an automatic antihacking system as well as a multilingual remote web management interface that makes its configuration as easy as browsing a web site.
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Kestrel
Kestrel is a cross-platform web server for ASP.NET Core. Kestrel is the web server that's included and enabled by default in ASP.NET Core project templates. Kestrel supports HTTPS, HTTP/2 (except on macOS), Opaque upgrade used to enable WebSockets, Unix sockets for high performance behind Nginx. Kestrel is supported on all platforms and versions that .NET Core supports. Some browsers require granting explicit permission to trust the local development certificate. Project templates configure apps to run on HTTPS by default and include HTTPS redirection and HSTS support. The Kestrel web server has constraint configuration options that are especially useful in Internet-facing deployments. There's a separate limit for connections that have been upgraded from HTTP or HTTPS to another protocol (for example, on a WebSockets request). The default maximum request body size is 30,000,000 bytes, which is approximately 28.6 MB.
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