httpuv

Separates I/O handling from R callbacks using libuv, enabling non-blocking operations like static file serving without impacting R performance, as highlighted in the static paths section.

Built on proven C libraries (libuv and http-parser) by Joyent, ensuring reliable HTTP and WebSocket protocol support for stable server operations.

Provides direct access to HTTP requests and WebSocket events via customizable callbacks, allowing developers to implement custom server logic and real-time applications, as shown in the basic usage examples.

Serves files from disk in the I/O thread without blocking R, demonstrated through the staticPaths feature that handles file requests independently.