Server Sent Events (SSE) enable real-time communication from server to client over a persistent connection, utilizing the HTTP protocol for unidirectional data flow.
In a Node.js environment, establishing an SSE connection involves creating a subscription endpoint that keeps track of connected clients for future messaging.
Unlike WebSockets, which facilitate two-way communication, SSE is solely for server-to-client messaging, transmitting data in a specific text/event-stream format.
When setting up SSE, response headers must be specifically configured to establish the connection type, which allows for continuous data streaming to clients.
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