Look up what every HTTP response code means, from 1xx to 5xx, including Cloudflare errors.
What is the HTTP Status Codes Reference?
Every time a browser loads a page, the server replies with a three-digit HTTP status code. This reference explains all the common codes in simple words – from 200 OK and 301 redirects to 404 Not Found, 429 Too Many Requests, 500 Internal Server Error and Cloudflare’s 52x errors – with instant search and filters.
How to use the HTTP Status Codes Reference
- Type a code or keyword.
- Filter by class (2xx, 3xx, 4xx, 5xx).
- Read the explanation.
Status code classes
- 1xx – informational
- 2xx – success
- 3xx – redirection
- 4xx – client errors (wrong URL, no permission)
- 5xx – server errors
SEO tip
Use 301 for permanent URL changes so rankings transfer, return a real 404 for missing pages, and fix 5xx errors quickly – Google may drop pages that keep failing. Use our .htaccess Redirect Generator to create 301 rules.
Frequently asked questions
What is the difference between 301 and 302?
301 is permanent (passes SEO value), 302 is temporary.
What does 403 mean?
The server understood you but refuses access.
How do I fix a 500 error?
Check the server error log – often a PHP error, bad .htaccess rule or plugin conflict.
Is it free?
Yes.
This http status codes reference is 100% free, needs no signup and works on phones, tablets and computers.
Last updated: · By NodifyTech