What are Server Sent Events
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Ever noticed how AI replies appear word by word, or a dashboard updates live without refreshing? That's often Server-Sent Events. A normal HTTP request gets one response and closes — but SSE keeps one connection open and lets the server stream a flow of events straight to the browser. In this 20-minute visual guide we break down the wire format, the EventSource API, SSE vs WebSockets, and exactly when to reach for it.
No prior background needed — but if you've watched our WebSocket and Webhooks videos, this completes the three real-time patterns.
⏱️ TIMESTAMPS
00:00 The problem: the page that won't update
00:30 What SSE actually is
01:30 The live-radio analogy
02:30 One connection, many events
03:00 The format is dead simple
03:30 The browser side: EventSource
04:00 SSE vs WebSockets
04:30 The three real-time patterns
05:00 Where SSE shines
05:30 Why SSE is lovely
06:00 The catches
06:30 Common misconceptions
08:00 Running SSE well
08:30 SSE, WebSocket, or webhook?
🔧 WHERE YOU'LL MEET SSE
EventSource (browser) · OpenAI API token streaming · text/event-stream · Nginx + HTTP/2 · Express / FastAPI · Redis pub/sub
🎯 WHAT YOU'LL LEARN
• How SSE keeps one HTTP connection open to stream events
• The plain-text wire format (data:, event:, id:, retry:)
• The whole client API: one line of EventSource
• SSE vs WebSockets — one-way simple vs two-way powerful
• Why SSE is the default for streaming AI responses
🔐 GO DEEPER
Streaming connections, authentication and scaling open streams all need care. Knowing SSE, WebSockets and webhooks lets you pick the right tool every time. Explore the Dargslan curriculum:
👉 https://dargslan.com
📚 NETWORKING EXPLAINED SERIES
▸ HTTP/HTTPS · DNS · TLS · Load Balancers · Reverse Proxies · CDNs
▸ API Gateway · REST vs GraphQL vs gRPC · WebSocket · WebRTC · TCP/IP · Webhooks
▸ Server-Sent Events ← you are here
…plus the Auth, Infra and Data Explained series.
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