api cors_error ai_generated true

CORS preflight request failed

ID: api/cors-preflight-failure

Also available as: JSON · Markdown
82%Fix Rate
86%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
any active — — —

Root Cause

Browser CORS preflight check rejected by server.

generic

Workarounds

  1. 90% success Configure server to return correct CORS headers for allowed origins
  2. 88% success Use same-origin requests or server-side proxy for third-party APIs

Dead Ends

Common approaches that don't work:

  1. Use CORS proxy in production 85% fail

    Security risk, single point of failure

  2. Set Access-Control-Allow-Origin: * for all endpoints 78% fail

    Overly permissive CORS