ShareYourGroupShareYourGroupHTTP Codes and Headers

HTTP guides

The ideas behind the codes and headers.

All status codes Header checker

Where to start

If a page moved, read the redirects guide. If a change does not show, read the caching guide. If you are protecting a login, read the cookie and security header guides. If a download or video will not resume or seek, read the page on conditional and range requests. The status code classes page gives the overview of all codes, and the header checker explains any response you paste.

Every guide shows real requests and responses that we recorded from a test server, and the redirect guide shows what Chrome and WebKit really did.

This is an independent guide. It is not connected with the IETF, IANA, any browser maker or any company named here. Meanings were checked against the RFC texts on 14 November 2026. Responses shown were recorded on 14 November 2026 from a small test server on the author's own computer.