#htmx

Server Sent Events

A practical guide to implementing Server Sent Events (SSE) in Ruby using Rack 3.0.0 middleware and htmx on the frontend. Covers the full setup including an EventSource class for streaming data, Rack middleware with proper SSE headers, htmx SSE extension for the client, Puma thread configuration for specs, and optional Falcon server support. Includes a self-contained runnable demo script and tips on session handling, Nginx compatibility, and heartbeat comments to keep connections alive.