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HTTP Status Codes

A complete, plain-English reference for HTTP status codes. Click any code for its meaning, common causes, and fixes.

Frequently Asked Questions

What do the HTTP status code groups mean?: 2xx = success, 3xx = redirection, 4xx = client error (your request), 5xx = server error. The first digit tells you the category.
What is the difference between 401 and 403?: 401 Unauthorized means you are not authenticated (no valid login). 403 Forbidden means you are authenticated but not allowed to access the resource.
Is a 301 or 302 redirect better for SEO?: Use 301 (permanent) when a page has moved for good — it passes ranking signals. Use 302 (temporary) only for short-lived redirects.

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