HTTP Header Checker
Inspect response headers that a website exposes to your browser, including content type, caching, server hints and security-related headers.
How to Use the HTTP Header Checker
Enter a public URL to inspect the HTTP response headers returned by the server. This can help you review caching, redirects, content types, security policies and other response metadata used by browsers and clients.
Practical Example
A normal HTML page may return a Content-Type: text/html header together with cache-control and security headers. A redirect may return a 3xx status and a Location header pointing to another URL.
Factors That Affect the Result
Redirects, CDN behavior, server configuration, request method, geography, authentication and caching layers can change the headers a request receives. Dynamic sites may also return different values over time.
Frequently Asked Questions
What are HTTP response headers?
They are metadata fields sent by a web server alongside the response body.
Can headers affect website security?
Yes. Headers such as Content-Security-Policy and Strict-Transport-Security can influence browser security behavior.
Why do headers differ between tools?
Different request locations, redirect handling and caching layers can produce different responses.