HTTP Header Checker: An HTTP header checker fetches and displays the raw response headers a server returns for a URL — status code, content type, cache rules, security headers and redirects. Enter a URL to inspect how a site responds without opening developer tools.
Frequently Asked Questions
What are HTTP response headers?
HTTP response headers are metadata a server sends with each page, describing the content type, caching policy, cookies, security rules and status. They control how browsers and crawlers handle the response.
Which security headers should a website have?
Key security headers include Strict-Transport-Security (HSTS), Content-Security-Policy, X-Content-Type-Options, X-Frame-Options and Referrer-Policy. Missing these can leave a site open to common attacks.
What does a 301 vs 302 status mean in headers?
A 301 is a permanent redirect that passes SEO value to the new URL, while a 302 is temporary and tells search engines the original URL will return. Using the wrong one can dilute rankings.
How do I check a website's headers?
Enter the full URL into the checker and it requests the page and lists every response header. This helps diagnose caching, redirects, HTTPS enforcement and missing security policies.