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Why am I getting a CORS policy error when trying to fetch data from my locally running backend during development?

ChatGPTgpt-61 query11/1/2026
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Why am I getting a CORS policy error when trying to fetch data from my locally running backend during development?
1 real search · 1 real-search pass
CORS local development localhost different ports preflight Access-Control-Allow-Origin MDN documentationGoogle ↗
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ChatGPT1 real searches · gpt-6
CORS local development localhost different ports preflight Access-Control-Allow-Origin MDN documentation Google ↗
  1. Cross-Origin Resource Sharing (CORS) - HTTP · developer.mozilla.org
  2. CORS errors - HTTP · developer.mozilla.org
  3. Reason: CORS header 'Access-Control-Allow-Origin' missing - HTTP · developer.mozilla.org

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CORS local development localhost different ports preflight Access-Control-Allow-Origin MDN documentation
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