When SSR Breaks: Next.js Returning RSC Instead of HTML

While exploring a production site built with React + Next.js, I hit a route that didn’t return HTML. Instead, it returned the raw React Server Component (RSC) payload. Things like: • component tree references • chunk mappings (/_next/static/...) • providers (MantineProvider, ThemeProvider, etc.) Basically, the server streamed internal rendering data instead of a fully hydrated page. This usually points to: • incorrect route handling (e.g. non-standard paths like .txt) • misconfigured SSR / App R