Server Actions 101
/blog/server-actions-101
A Server Action is an async function marked "use server" that runs only on the server, but can be called directly from a form or a client event handler as if it were a normal function.
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app/blog/[slug]/page.tsx— one file handling every post slug. Try changing the URL to a slug that doesn't exist to see notFound() trigger the nearest not-found.tsx(or Next's default 404) instead of crashing.