By Team Hypomnema · Web & network
Simulate CORS decisions from supplied request and response settings.
Use the guide alongside the working tool.
Open CORS Policy Tester →Working local example
Use Try sample in the tool to load a labeled demonstration.Simulate CORS decisions from supplied request and response settings.
Prepare the right input
Enter the requesting origin and request details.
Paste the response and preflight headers.
Review before using the result
Inspect the matching rules and reasons for a simulated rejection.
No network request. Models common Fetch CORS checks, not redirects, private-network access, browser caching or every Fetch edge case. CORS is not authentication.
Privacy and trust boundaries
Inputs remain in this browser. No online reputation, account, DNS or remote key lookup is performed. A static inspection is not a security certification.
Use the sample to learn the workflow. Clear sensitive input after use; private exports and clipboard contents require careful handling.
Ready to apply this workflow?
Try CORS Policy Tester →Explore a related workflow
- Security Headers Analyzer: workflow, verification and limits
Review pasted HTTP response headers and practical hardening gaps.
- CSP Builder & Analyzer: workflow, verification and limits
Build and inspect a Content Security Policy without contacting a site.
- Permissions Policy Builder: workflow, verification and limits
Create explicit browser-feature permission policies.
- Cookie Security Analyzer: workflow, verification and limits
Inspect Set-Cookie flags, scope and browser prefix requirements.
Keep your original files and review the result. Found unclear instructions? Contact Team Hypomnema.