A fast HTTP / Websocket Server with built-in Pub/Sub support (with or without Redis), static file support and many other features, optimized for Ruby MRI on Linux / BSD / macOS / Windows
A Unix based system: Linux / macOS / BSD.
An updated C compiler.
Ruby >= 2.3.8 (Ruby EOL).
Ruby >= 2.5.0 recommended.
TLS requires OpenSSL >= 1.1.0.
Or Windows with Ruby >= 3.0.0 build with MingW and MingW as compiler.