Resolving a CORS Issue
Troubleshooting CORS errors in development and production
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I'm encountering a CORS error between my frontend at [FRONTEND_URL] and my backend at [BACKEND_URL]. Here are my request headers and the server response: [paste_headers]. Explain exactly why the error occurs, which CORS headers I need to configure server-side with [Express/Nginx/other], and whether I need to modify anything client-side. Provide the configuration code.
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