Ember FastBoot App Server

fastboot-app-server is a dedicated application server designed for deploying and running Ember FastBoot applications in production environments. It provides robust capabilities for managing the lifecycle of an Ember app, including downloading new builds, automatically scaling across CPU cores using Node.js clustering, and seamlessly detecting and hot-reloading new application versions without downtime. The current stable version is 4.1.4. The project maintains a steady release cadence with frequent patch updates and less frequent major versions, with v4.0.0 released in early 2024. Key differentiators include its built-in extensibility, allowing developers to customize how app builds are downloaded (Downloader), how new versions are detected (Notifier), and even swap out the underlying HTTP server implementation (e.g., using Express) to integrate custom middleware or routing. It aims to simplify the operational aspects of server-side rendering Ember applications.