HTTP Headers Checker

Follow a URL's redirects hop by hop and inspect the final response headers, with a grade for the security headers browsers rely on.

FAQ

301 or 302: which redirect should I use?
Use 301 (or 308) for permanent moves, such as http to https; search engines pass ranking to the new URL. 302 and 307 are for temporary redirects.
Which security headers matter most?
Strict-Transport-Security and Content-Security-Policy give the most protection; X-Content-Type-Options, Referrer-Policy and frame protection are quick wins.

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