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CORS ISSUE trying to send data to my server – Reactjs

"Access to XMLHttpRequest at 'http://localhost:3000/campgrounds/6411f03e718f68104cac045a' (redirected from 'http://localhost:5000/campgrounds') from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource." This is my code on…

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