Can you explain why CORS policy errors happen between different ports during local web development and give me a plain English guide on how to resolve them?
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Fan-out diagram
The searches the AI actually ran for this prompt.
SEED QUERY
Can you explain why CORS policy errors happen between different ports during local web development and give me a plain English guide on how to resolve them?
1 real search · 1 real-search pass
MDN CORS guide Access-Control-Allow-Origin preflight requests and Vite server proxy documentationGoogle ↗
OBSERVED
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Google's semantic query class for every sub-query: what kind of answer each search is after, simulated vs real.
Classifying 1 queries…
Searches and sources
ChatGPT1 real searches · gpt-6
MDN CORS guide Access-Control-Allow-Origin preflight requests and Vite server proxy documentation Google ↗
- http\://localhost:5000/api/users · localhost
- http\://localhost:3000? · localhost
- Cross-Origin Resource Sharing (CORS) - HTTP · developer.mozilla.org
- Preflight request - Glossary · developer.mozilla.org
- Reason: CORS header 'Access-Control-Allow-Origin' missing - HTTP · developer.mozilla.org
- CORS errors - HTTP · developer.mozilla.org