Six HTTP status codes explain most of the web

The request worked and the response holds what you asked for. It is the code behind almost every page you load.

The page now lives at a new address, given in the Location header. Browsers and search engines follow it and remember the change.

You need to sign in first, or your credentials were wrong. Send valid credentials and try again.

The server knows who you are and still refuses. Signing in again will not help: you lack permission for this resource.

Nothing exists at this address. Check the URL for typos, or the page may have been removed.

The server hit an unexpected problem. Nothing is wrong with your request, so retry later or tell the site owner.