Why Real-Time Notifications Matter for Video Platforms When a K-pop music video suddenly goes viral in South Korea, or a Japanese gaming stream breaks into the trending charts, users of TopVideoHub should know about it within seconds — not the next time they refresh. WebSockets make that possible. This article walks through building a WebSocket notification server that broadcasts "new trending video" events to connected clients as soon as the cron fetcher discovers them. Architecture Overview Cron Fetcher (PHP) ──→ Redis Pub/Sub ──→ Python WS Server ──→ Browser clients Enter fullscreen mode Exit fullscreen mode The PHP cron fetcher publishes events to Redis. A lightweight Python WebSocket server subscribes to Redis and fans those events out to all connected browsers. This decoupling means the fetcher never blocks waiting for browser connections.…