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What does an HTTP 301, 404 and 503 status code mean?
And, when are they used?
HTTP Code 301 means redirect and is most often used to forward a user from an old page to a new one.
404 code means Not Found, the page/file does not exist.
503 http code means Service unavailable. Something is wrong with the HTTP service on the server (or some error in code).
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Check http://www.w3schools.com/tags/ref_httpmessages.asp for a full list of status codes.
HTML stands for Hypertext Markup Language.