HTTP Headers Checker - Inspect Response Headers of Any URL

🔎 HTTP Headers Checker

Enter any URL to inspect its HTTP response headers. Security headers are highlighted separately. All requests are proxied server-side — your browser never contacts the target directly.

How to check HTTP response headers

Enter a URL and see all response headers in seconds — no browser dev tools needed.

01
Enter a URL
Paste the full URL including https://. The tool makes a HEAD request and returns all response headers.
02
Review the headers
See all response headers including Content-Type, Cache-Control, security headers, and server information.
03
Check for missing security headers
The tool flags missing headers like Strict-Transport-Security, X-Content-Type-Options, and Content-Security-Policy.

When you'd check response headers

Security headers missing from your site

HSTS, CSP, X-Frame-Options, X-Content-Type-Options — these are the four most commonly missing. The tool flags which ones aren't set.

Static assets not being cached

If Cache-Control is missing or set to no-store on your images and JS files, browsers re-download them on every page load. Check and fix.

CORS errors in the browser console

Access-Control-Allow-Origin is the header that controls cross-origin requests. Check what value the server is actually returning vs what your frontend expects.

A redirect isn't going where you think

The Location header in a 301 or 302 response shows the exact destination. Check it when a redirect chain isn't behaving as expected.

Checking what server software is exposed

The Server header often reveals the web server and version. Some security policies require this to be hidden or obscured.

Verifying Content-Type for an API endpoint

An API returning text/html instead of application/json will break most clients. Check the Content-Type before debugging the response body.

Frequently asked questions

Free, no account, no limits.

Strict-Transport-Security (HSTS), X-Content-Type-Options, X-Frame-Options, and Content-Security-Policy are the most important ones.

Some servers block requests from non-browser clients or require specific headers. CORS restrictions may also prevent the fetch.

HTTP Strict Transport Security tells browsers to always use HTTPS for a domain, preventing downgrade attacks.

It prevents browsers from MIME-sniffing a response away from the declared Content-Type, which can prevent certain attacks.

Yes, in any modern mobile browser.

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