What are the categories of HTTP status codes?

Five categories: 1xx (Informational), 2xx (Success), 3xx (Redirection), 4xx (Client Error), 5xx (Server Error). Common ones: 200 OK, 301 Moved Permanently, 404 Not Found, 500 Internal Server Error.

What's the difference between 301 and 302?

301 is permanent redirect — search engines transfer ranking to the new URL. 302 is temporary — search engines keep indexing the original URL. Use 301 for SEO migrations.

What's the difference between 404 and 410?

404 means resource not found (possibly temporary). 410 means resource is permanently gone. Search engines remove 410 pages from the index faster.

HTTP Status Codes Reference | 1xx-5xx

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Complete IETF-standard HTTP status code reference (RFC 7231, etc.), covering all codes from 1xx to 5xx. Search by code or keyword, filter by category. Click any card to copy the code. 📡 No Sign-up

What is HTTP Status Codes Reference | 1xx-5xx?

HTTP Status Codes Reference | 1xx-5xx is a free online tool that runs entirely in your browser. No download or signup needed — enter HTTP Status Codes and other values to get results instantly. All data is processed locally.

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What is HTTP Status Codes Reference | 1xx-5xx?

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