How to Fix S3 Static Site Refresh Errors Using CloudFront Custom Error Pages

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Single Page Applications hosted on Amazon S3 commonly throw 403 or 404 errors when users refresh a page or access a deep link directly, because S3 looks for a literal file matching the URL path rather than deferring to client-side routing. The traditional workaround of using S3's built-in static website hosting redirection rules resolves the user-facing issue but returns incorrect HTTP status codes, harming SEO and analytics accuracy. The recommended fix is to pair an S3 bucket with Amazon CloudFront and configure custom error responses that serve the app's index.html for both 403 and 404 errors while returning a 200 status code, allowing the SPA router to handle navigation. CloudFront also adds HTTPS support via SSL certificates, lower latency through edge caching, and URL-preserving error handling that S3 redirects cannot provide. Developers are advised to use the S3 bucket's REST endpoint rather than the website endpoint, and to manage all routing and error logic entirely through CloudFront for a production-grade setup.

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