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My teenage daughter is building her first web app and keeps running into frustrating CORS policy errors when calling her backend API from localhost. What is the cleanest way to fix this without compromising security while she tests?

ChatGPTgpt-61 query11/1/2026
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My teenage daughter is building her first web app and keeps running into frustrating CORS policy errors when calling her backend API from localhost. What is the cleanest way to fix this without compromising security while she tests?
1 real search · 1 real-search pass
MDN CORS guide origin credentials preflight Express cors middleware documentation Vite server proxy documentationGoogle ↗
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ChatGPT1 real searches · gpt-6
MDN CORS guide origin credentials preflight Express cors middleware documentation Vite server proxy documentation Google ↗
  1. cors middleware · expressjs.com
  2. Cross-Origin Resource Sharing (CORS) - HTTP · developer.mozilla.org
  3. CORS errors - HTTP · developer.mozilla.org
  4. Reason: CORS header 'Access-Control-Allow-Origin' missing - HTTP · developer.mozilla.org

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MDN CORS guide origin credentials preflight Express cors middleware documentation Vite server proxy documentation
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