HTTP Status Codes — Free Online

Reference all HTTP status codes

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Sources we checked for HTTP Status Codes

• robotstxt.org — The original robots exclusion protocol reference.
• IETF RFC 9309 — Robots Exclusion Protocol — The standardised robots.txt specification.
• Google Search Central documentation — Google's own crawling and indexing guidance.
• web.dev by Google — Practical guidance on performance and web quality.