SEO glossary

HTTP status code

A three-digit number a server returns with every response to say whether the request succeeded, was redirected or failed.

The most important for SEO are 200 (OK), 301 and 308 (permanent redirect), 302 and 307 (temporary redirect), 404 (not found), 410 (gone) and 5xx (server errors).

See the status and headers of any URL with the HTTP Header Checker.

Related tools

XML Sitemap ValidatorFind and validate the XML sitemap of any website: XML errors, URL count, sitemap indexes, lastmod dates, duplicates and robots.txt declaration.HTTP Header CheckerSee all the HTTP response headers of any URL, with checks for indexing (X-Robots-Tag), compression, caching and security headers.Redirect CheckerFollow every redirect of a URL: see each hop, its status code (301, 302, 307, 308), redirect chains, loops and the final destination.

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