Loading...
Loading...
Stop making users wait for buffered responses. Build a FastAPI /stream endpoint that pushes tokens live over Server-Sent Events, then wire it into a Next.js client that renders partial output as it arrives.
Message a mentor about fit, prerequisites, or where to start. Replies come on WhatsApp, usually within a day.
Engineers are learning here from
Build a production /stream endpoint that pushes LLM tokens live to a Next.js client over Server-Sent Events, with heartbeats, graceful disconnect handling, and error frames.
Ship a streaming backend that keeps clients responsive and cancels work the moment a user disconnects.
What you'll ship
What you'll learn
Curriculum
Why streaming
Understand the latency math behind streaming and pick the right transport for the job
The SSE wire format
Learn exactly what bytes flow over an SSE connection so nothing feels like magic
FastAPI streaming
Emit SSE frames from FastAPI with async generators, wrap a real LLM, and keep the connection alive
Graceful disconnects
Detect client hangups, cancel upstream LLM work, and send error frames the client can trust
The Next.js client
Consume the SSE endpoint from a React page with partial token rendering and smooth UX
Who it's for
who want real-time token streaming without reaching for WebSockets or a framework they do not understand
who need a streaming endpoint that plays nicely with React hooks and Vercel edge runtime
tired of LLM requests burning tokens after the user already closed the tab
FAQ
Comfort with Python and async/await is enough. We use FastAPI patterns directly from the reference workshop, and every snippet shows the full context.
SSE is a one-way server push over plain HTTP, so it works through load balancers and CDNs without special handling. WebSockets are great when you need bidirectional traffic. For LLM token streaming, that overhead is wasted.
Yes. The Next.js client portion shows the Vercel AI SDK pattern with `toUIMessageStreamResponse`. The FastAPI backend works on any platform that supports long-lived HTTP connections.
Pricing
Subscribe to Pro for every paid course, or buy just this one.
Unlock this course and every paid course plus workshop replays. One subscription.
You save 54% with regional pricing
One-time purchase. Lifetime access to every lesson, exercise, and update.
You save 41% with regional pricing
Still deciding? Ask Param a question
Streaming APIs with Server-Sent Events
$29 one-time