Check API vulnerabilities through response headers.

Paste raw response headers or try a browser fetch for a CORS-enabled endpoint. This free API security testing tool gives a fast review of transport, caching, CORS, fingerprinting, and rate-limit hints.

Fetch headers from URL

Or paste raw headers

What this tool checks

HSTS and transport policy presence.
Wildcard or risky credentialed CORS patterns.
Cache behavior on potentially sensitive responses.
Exposure of Server and X-Powered-By fingerprints.
Visible rate limit guidance headers.

For deeper testing, pair this result with server-side scans and the API security checklist.

Paste response headers or fetch a CORS-enabled endpoint to start.