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Netlify
2 guides
Vercel 404 NOT_FOUND on Page Refresh: How to Fix It
Your Vite or React app works until you refresh a page, then Vercel shows 404: NOT_FOUND. Here's why it happens and the one-file fix.
Why is my Bolt.new app not working after deploy?
It worked in Bolt's preview, then broke once it was live. The usual reasons — environment variables, auth redirect URLs, routing, build settings — and how to fix each one, step by step.