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Web Development Intermediate

What is Server-Sent Events?

A server push technology that enables a server to send real-time updates to a browser over a single HTTP connection.

SSE provides a simple, unidirectional channel from server to client. The server sends events as text/event-stream content type. The browser uses EventSource API: const source = new EventSource('/events'); source.onmessage = e => console.log(e.data).

SSE is simpler than WebSockets for one-way communication (notifications, live feeds, stock tickers). It supports automatic reconnection, event IDs for resume, and named events. SSE uses standard HTTP, working through firewalls and proxies without special configuration.

Related Terms

TypeScript
A typed superset of JavaScript that adds static type checking, interfaces, and advanced IDE support to JavaScript development.
Service Worker
A JavaScript file that runs in the background, enabling offline support, push notifications, and background sync for web apps.
CSS Grid
A two-dimensional CSS layout system for creating complex grid-based designs with rows and columns.
CORS Headers
HTTP headers that control cross-origin resource sharing between different domains, specifying allowed origins, methods, and headers.
OAuth Scope
A mechanism in OAuth that limits an application's access to a user's account to specific resources or actions.
Server-Sent Events (SSE)
A web technology enabling servers to push real-time updates to browsers over a single HTTP connection, simpler than WebSockets.
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