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How do I debug a CORS policy violation that only occurs on Vercel production deployments and not in my local development environment?

ChatGPTgpt-62 queries10/31/2026
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The searches the AI actually ran for this prompt.

SEED QUERY
How do I debug a CORS policy violation that only occurs on Vercel production deployments and not in my local development environment?
2 real searches · 1 real-search pass
Vercel official documentation CORS headers serverless functions OPTIONS preflight vercel.json headers rewritesGoogle ↗
OBSERVED
MDN CORS preflight request Access-Control-Allow-Credentials Vary Origin debuggingGoogle ↗
OBSERVED

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Classifying 2 queries…

Searches and sources

ChatGPT2 real searches · gpt-6
Vercel official documentation CORS headers serverless functions OPTIONS preflight vercel.json headers rewrites Google ↗
MDN CORS preflight request Access-Control-Allow-Credentials Vary Origin debugging Google ↗
  1. How can I enable CORS on Vercel? · vercel.com
  2. CORS errors - HTTP · developer.mozilla.org
  3. Static Configuration with vercel.json · vercel.com
  4. Rewrites on Vercel · vercel.com

Queries

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Query / typeSearchIntentQuery classRouting formatClusterFreq ↓Weight
Vercel official documentation CORS headers serverless functions OPTIONS preflight vercel.json headers rewrites
OBSERVED
Google ↗
AI Mode ↗
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of 1
MDN CORS preflight request Access-Control-Allow-Credentials Vary Origin debugging
OBSERVED
Google ↗
AI Mode ↗
————1x
of 1