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/CORS// security

Spoof Origin headers against remote API infrastructure to analyze Access-Control policies and intercept potential CSRF vulnerabilities.
Deep Link: /tool/network/cors

What is the Cross-Origin Proxy Pre-flight Engine?

A server-side HTTP client orchestrator that bypasses local browser security restrictions to manually craft and inspect unadulterated multi-origin capability handshakes.

How it Works under the hood

Due to the strictly enforced Same-Origin Policy within modern V8/Webkit browsers, client-side React code cannot accurately read CORS denial metadata directly. This tool bounces your payload into our generic Node.js router, injects your specified attacker `Origin` URL, fires a preflight `OPTIONS` mechanism against the target, and exposes the literal `Access-Control-Allow-Origin` boundary parameters the remote server returns.

SysAdmin & Security Use Cases

  • »Verify your Next.js frontend has authorization to ingest data from an isolated Express/Django REST API deployment.
  • »Detect catastrophic 'Origin Reflection' configurations where developers blindly Echo back any supplied Origin payload in production.
  • »Ensure Amazon S3 or Cloudfront distribution buckets are correctly returning wildcard headers for WebFont (`.woff2`) delivery.
  • »Debug pre-flight rejection errors triggered by invalid `Access-Control-Allow-Methods` structures.