Build a Real-Time Notification System with Server-Sent Events
Your users are waiting for that "new message" alert, but your current polling strategy is burning database CPU and draining battery life. Every few seconds, your frontend fires an HTTP request asking, "Is there anything new?" and the server replies, "Nope." Do this a thousand times a minute, and you’ve built a performance nightmare.
The solution isn’t always WebSockets, which introduce complex connection management and bi-directional state. For the specific case of pushing notifications from server to client, there’s a simpler, standardized, and often more efficient tool: Server-Sent Events (SSE).
SSE allows the server to push updates to the client over a single, long-lived HTTP connection. It’s unidirectional (server → client), lightweight, and works natively in browsers via the EventSource API. Let’s build a real-time notification system you can deploy today using Python.
Why SSE Beats Polling (and Sometimes WebSockets)
