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How Cloudflare Workers and Scripts Handle 404 Errors

The first script in the given example shows how to use JavaScript to handle a 404 error on the frontend. The script uses the window.onload event to wait for the page to fully load. The page makes a fetch request to see if the resource is available once it has loaded. The user is sent to a customized error page if the resource returns a 404 error. With no need for backend involvement, this technique is particularly useful for managing failures right in the user’s browser and providing a fallback for any missing pages or resources.