Security
API Security Headers Checker
Analyze security-related HTTP response headers.
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What is API Security Headers Checker?
The API Security Headers Checker inspects security-relevant HTTP response headers returned by a public API endpoint. It helps developers identify missing or potentially weak transport, caching, content-type and cross-origin signals.
What this tool checks
- HTTPS usage
- Strict-Transport-Security
- Content-Type
- Cache-Control
- X-Content-Type-Options
- Access-Control-Allow-Origin behavior
How to use it
- Enter a public API URL.
- Run the header check.
- Review each observed header and its current value.
- Confirm recommendations against your API architecture before changing production configuration.
Important:
Browser-oriented headers are not equally important for every API. Results should be interpreted according to whether the endpoint is consumed by browsers, servers, mobile applications or other clients.
Frequently asked questions
Is a missing header always a vulnerability?
No. The security importance of a header depends on how the API is used.
Does this checker follow redirects?
No. Redirect following is intentionally disabled in the server-side request engine.