Technical SEO Wiki Entry
HTTP Status Codes
Standardised server response codes that indicate request outcomes.
Key SEO-relevant codes: 200 OK (success), 301 Moved Permanently (preferred for permanent redirects), 302 Found (temporary), 304 Not Modified (caching), 404 Not Found, 410 Gone (more permanent than 404), 500 Server Error, 503 Service Unavailable. Audits should monitor for unexpected 4xx/5xx codes which signal broken links or server problems.
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