Itsi is a high-performance web and application server with first-class support for Ruby applications. It is a Rack-compliant server that can also operate as a reverse proxy, API gateway, gRPC server, and static file server.
The software combines a Rust-powered server core with an expressive Ruby configuration API and DSL.
This is free and open source software.
Key Features
- Runs Rack-compatible Ruby applications and middleware.
- Serves static files with caching, range requests, automatic indexes, and fallback routing.
- Operates as a reverse proxy with load balancing, failover, and automatic retries.
- Provides HTTP/1.1, HTTP/2, WebSocket, and gRPC support.
- Offers a gRPC and REST compatibility layer for JSON clients.
- Supports gzip, Brotli, Zstandard, deflate, and streaming compression.
- Automates TLS certificate provisioning with Let’s Encrypt.
- Provides JWT, API key, and HTTP Basic authentication.
- Includes rate limiting, IP access controls, and intrusion protection.
- Supports zero-downtime configuration reloads and phased restarts.
- Runs multiple workers to take advantage of multicore systems.
- Offers non-blocking concurrency through Ruby’s Fiber Scheduler.
- Provides structured logging, request logging, and status reporting.
- Uses a Ruby configuration API and domain-specific language.
Website: github.com/wouterken/itsi
Support:
Developer: Wouter Coppieters
License: GNU Lesser General Public License v3.0
Itsi is written in Rust and Ruby. Learn Rust with our recommended free books and free tutorials. Learn Ruby with our recommended free books and free tutorials.
Related Software
| Ruby Application Servers | |
|---|---|
| Puma | Concurrent web server for Ruby and Rack |
| Phusion Passenger | Web server and application server for Ruby, Python and Node.js |
| Falcon | Asynchronous Rack-compatible engine for fast, scalable web traffic |
| pitchfork | Preforking HTTP engine designed for resilience and steady throughput |
| iodine | Lightweight HTTP and WebSocket service built for demanding loads |
| unicorn | HTTP server for Rack applications |
| Itsi | High-performance web serving with efficient request handling |
| Rainbows! | HTTP server for sleepy Rack applications based on Unicorn |
| Agoo | Fast HTTP platform with WebSocket support and very low overhead |
| yahns | Sleepy, multi-threaded, non-blocking application server for Ruby |
Read our verdict in the software roundup.
 Explore our comprehensive directory of recommended free and open source software. Our carefully curated collection spans every major software category.This directory is part of our ongoing series of informative articles for Linux enthusiasts. It features hundreds of detailed reviews, along with open source alternatives to proprietary solutions from major corporations such as Google, Microsoft, Apple, Adobe, IBM, Cisco, Oracle, and Autodesk. You’ll also find interesting projects to try, hardware coverage, free programming books and tutorials, and much more. Discovered a useful open source Linux program that we haven’t covered yet? Let us know by completing this form. |
Please read our Comment Policy before commenting.