How do I fix this persistent CORS policy error when my React app running on localhost tries to fetch data from our staging API server.
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Fan-out diagram
The searches the AI actually ran for this prompt.
SEED QUERY
How do I fix this persistent CORS policy error when my React app running on localhost tries to fetch data from our staging API server.
1 real search · 1 real-search pass
official CORS configuration documentation Express cors middleware; MDN CORS guide; Spring Security CORS documentationGoogle ↗
OBSERVEDInstruction
Badge and edge weight = share of passes that produced the query. Hover a query for its intent and routing format.
Query classes
Google's semantic query class for every sub-query: what kind of answer each search is after, simulated vs real.
ChatGPT real searches (1)
Classes come from the query-classifier (a local Laya model). 1 of 1 calls are low-confidence (under 50%) — hover a query in the table to see its confidence.
Searches and sources
ChatGPT1 real searches · gpt-6
official CORS configuration documentation Express cors middleware; MDN CORS guide; Spring Security CORS documentation Google ↗
- CORS errors - HTTP · developer.mozilla.org
- Cross-Origin Resource Sharing (CORS) configuration - Security · developer.mozilla.org
- Reason: CORS header 'Access-Control-Allow-Origin' missing - HTTP · developer.mozilla.org