How to Fix CORS & 401 Errors Locally Using the Header Override Extension

Learn how to fix CORS and 401 Unauthorized errors locally using the Header Override browser extension—without changing your backend code.
In this quick tutorial, you’ll learn how to:
• Add an Authorization: Bearer test-token request header
• Override the Access-Control-Allow-Origin response header
• Scope rules to specific localhost URLs
• Verify modified response headers using fetch()
• Debug authentication and CORS issues directly in the browser

Try Header Override: https://headeroverride.com

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