The 404 error occurs with YouTube thumbnails because the onError event of the img tag is not triggered, despite the browser recognizing the error.
YouTube still serves a fallback thumbnail even when the requested one returns a 404 error, which prevents the onError function from activating.
To effectively handle image loading errors, server-side fetching is recommended to check the response status before sending to the client.
Using getServerSideProps in Next.js ensures proper handling of image fetching, allowing for fallback images if the requested thumbnail fails.
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