What does 401 stand for?

MLA style: "401." Acronym Finder . 2012. AcronymFinder.com 31 May. 2012 <a href="http://www.acronymfinder.com/HTTP-Web-Error-401-_-Authorization-Required-(401).html">http://www.acronymfinder.com/HTTP-Web-Error-401-_-Authorization-Required-(401).html
Chicago style: Acronym Finder . S.v. "401." Retrieved May 31 2012 from <a href="http://www.acronymfinder.com/HTTP-Web-Error-401-_-Authorization-Required-(401).html">http://www.acronymfinder.com/HTTP-Web-Error-401-_-Authorization-Required-(401).html
APA style: 401. (n.d.) Acronym Finder. (2012). Retrieved May 31 2012 from <a href="http://www.acronymfinder.com/HTTP-Web-Error-401-_-Authorization-Required-(401).html">http://www.acronymfinder.com/HTTP-Web-Error-401-_-Authorization-Required-(401).html

HTTP Web Error 401 - Authorization Required

This definition appears very rarely and is found in the following Acronym Finder categories:

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Head, Heart, Hands, Health (pledged by members of 4-H Clubs) N-(4-Methoxyphenyl) Retinamide (Fenretinide) Four-Level Pulse Amplitude Modulation (telecommunications) 4-Phenylcyclohexene Four-Phase Quadrature Amplitude Modulation 4-Wheel Drive Four Wire Traffic Accident - Public Road (Alabama Public Safety Radio Code) Bad Request (HTTP status code; indicates bad syntax or unfulfillable) Temporary Redirect (HTTP status code; look elsewhere on that request only)		Payment Required (HTTP status code; never used, intended as error for nonpayment) HTTP Web Error 403 - Access Forbidden I Have No Clue (chat abbreviation) Item/Article Not Found (web/HTTP code) Method Not Allowed (HTTP status code; indicates a request in an unsupported format) Not Acceptable (HTTP status code) Proxy Authentication Required (HTTP status code) Request Timeout (HTTP status code) Conflict (HTTP status code) 40th Infantry Division (Mechanized)