WebSocket Real-Time Architecture: From Connection Pooling to Graceful Reconnection

The useful part

You build a basic WebSocket connection, messages flow instantly, and it feels like magic. Then your first user's network hiccups, their browser crashes, or you deploy an update and suddenly 500 clients are screaming reconnect requests at your server. That's when you realize the Hello World examples glossed over the hard part.

How it works

• That works until you hit 10k concurrent users and your CPU is thrashing.
• I've built real-time collaboration features in CitizenApp, and I've learned that WebSocket architecture isn't about the connection itself—it's about what happens when the connection breaks.

Details worth keeping

This post covers the patterns I actually use in production. Each WebSocket connection consumes memory and file descriptors.