Why Is My localhost CORS Request Failing Despite Correct Header Configuration?

Troubleshooting CORS Origin Issue with localhost

Despite setting appropriate headers on your Nginx/Node.js server to enable CORS, you're encountering an error when making a request from localhost to a different origin. The error message indicates that the Access-Control-Allow-Origin header set to http://localhost is being rejected.

Chrome's Limitation

The issue lies with Chrome itself. Chrome does not support localhost as an allowed origin for CORS requests. This behavior is due to a long-standing bug that was marked WontFix in 2014.

Workarounds

• Use a different domain: Instead of http://localhost, use a domain like localho.st, which resolves to the same IP address (127.0.0.1).
• Disable web security: For testing purposes, you can temporarily disable Chrome's web security features by launching Chrome with the --disable-web-security flag.

Additional Considerations

• Make sure you're accessing the correct origin in your client script.
• Check that the browser's "Same-Origin Policy" is not interfering by blocking the request.
• If the problem persists, consider checking the server's logs or using a network debugging tool to identify any additional errors or discrepancies.

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