Software Design

How Server-Sent Events Maintain Real-Time Feeds

UML Sequence Diagrams · made in Skemio

Sequence diagram of Server-Sent Events flow showing HTTP 200 text/event-stream setup, server data pushes, disconnect, and automatic reconnection with Last-Event-ID.

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What it shows

SSE uses standard HTTP/1.1 or HTTP/2 GET with text/event-stream
Clients automatically reconnect using Last-Event-ID if a drop occurs
Runs over ordinary HTTPS, making it firewall-friendly and simple

The takeaway

Use SSE when you only need server-to-client updates over persistent HTTP.

#ServerSentEvents,#SystemDesign,#Backend,#APIDesign,#WebDev,#Architecture

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