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HTTP Status Codes

A complete, searchable reference of every HTTP status code and what it means. Type a code (like 404) or a word (like redirect) to filter.

About HTTP status codes

Every time a browser or app talks to a web server, the server answers with a three-digit status code that says how the request went. The first digit sets the category: 1xx informational, 2xx success, 3xx redirection, 4xx client errors (something wrong with the request), and 5xx server errors (something wrong on the server).

Knowing them helps you debug APIs, fix broken links, and set up redirects correctly — for example, using a 301 (permanent) instead of a 302 (temporary) redirect matters for SEO. This page lists them all with plain-English meanings, and it all runs in your browser.