juliusbrussee/caveman
Compressed caveman-style prose for AI coding agents — cuts ~65% output tokens while keeping full technical accuracy
96
100%
Does it follow best practices?
Impact
96%
1.00xAverage score across 38 eval scenarios
Passed
No known issues
task.mdevals/scenario-6/
CORS Preflight Debugging
Problem
A React frontend at https://app.example.com makes a POST request with JSON to an API at https://api.example.com. The browser console shows: "Access to XMLHttpRequest has been blocked by CORS policy: Response to preflight request doesn't pass access control check."
The API has Access-Control-Allow-Origin: * set. Why is it still failing and how do you fix it?
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