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
A Unix based system: Linux / macOS / BSD.
An updated C compiler.
Ruby >= 2.2.2 required for Rack 2.
Ruby >= 2.5.0 recommended.
TLS requires OpenSSL >= 1.1.0