What is HTTP Headers?
HTTP Headers is a free online tool that shows the response headers of any public URL. Quickly check status codes, caching, compression and security headers such as HSTS, CSP and X-Frame-Options.
Inspect HTTP response headers online for security and caching. Spot missing CSP/HSTS quickly — free header checker on Fah Swe Tools.
Key features
- Full response header list
- Highlights important security headers
- Cache-Control and compression signals
- Free, no signup
Popular uses
- Audit website security headers
- Debug caching and CDN behaviour
- Check server and content-type responses
Also known as: Response Header Checker, Security Headers Test, HTTP Header Viewer.
How it works
- Enter a URL.
- Fetch HEAD/GET.
- Review important headers.
FAQ
Security headers?
We highlight CSP, HSTS, X-Frame-Options, and more.
Which security headers should a website have?
At minimum: Strict-Transport-Security, Content-Security-Policy, X-Content-Type-Options and Referrer-Policy.
What does Cache-Control do?
It tells browsers and CDNs how long they may store a response before asking the server again.