HTTP header checker
See the response headers a URL sends after any redirects: the status, the security headers that are present or missing, caching, compression and the CDN or firewall in front of the site.
Free and unlimited: does not use your weekly runsWhat the header checker shows
Every header of the final answer, and a check of six security headers: Strict-Transport-Security, Content-Security-Policy, X-Content-Type-Options, X-Frame-Options, Referrer-Policy and Permissions-Policy. Then caching (Cache-Control, ETag, Last-Modified), compression (gzip or Brotli), the content type and charset, and an X-Robots-Tag that may keep the URL out of search results.
From the headers the tool also recognizes the CDN or firewall in front of a site, such as Cloudflare, Fastly, Akamai, Amazon CloudFront or Sucuri.
Site audit: the full version
Crawl your site, get the issues sorted by impact and explained in plain language.
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Frequently asked questions
Do security headers help my rankings?
Not directly. HTTPS is a light ranking signal, and the other headers protect your visitors. A site that gets hacked does lose rankings, so they are worth setting.
Does this tool count towards my free runs?
No. It is free and unlimited, apart from a limit per site per hour.
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