Can someone break down the core idea behind server‑side rendering (SSR) in Next.js? I'm trying to understand what happens under the hood when a page request hits the server, how the initial HTML is generated, and how data fetching methods like getServerSideProps fit into the flow. Also, what are the trade‑offs compared to static generation? Would love some clear explanations or diagrams.
How does server‑side rendering work in Next.js and when should I use it?
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When a request hits a Next.js page that uses `getServerSideProps`, the server runs that function, fetches any data you need, renders the React components to HTML and sends the fully‑filled markup to the browser—so the first paint already contains the data. I usually pick SSR for pages that need up‑to‑date info on every request (e.g., user‑specific dashboards), while static generation is cheaper and faster for content that rarely changes; just remember SSR adds a bit more latency and server load because the HTML is rebuilt on each hit.