What does 407 stand for?

MLA style: "407." Acronym Finder . 2012. AcronymFinder.com 3 Jun. 2012 <a href="http://www.acronymfinder.com/Proxy-Authentication-Required-(HTTP-status-code)-(407).html">http://www.acronymfinder.com/Proxy-Authentication-Required-(HTTP-status-code)-(407).html
Chicago style: Acronym Finder . S.v. "407." Retrieved June 3 2012 from <a href="http://www.acronymfinder.com/Proxy-Authentication-Required-(HTTP-status-code)-(407).html">http://www.acronymfinder.com/Proxy-Authentication-Required-(HTTP-status-code)-(407).html
APA style: 407. (n.d.) Acronym Finder. (2012). Retrieved June 3 2012 from <a href="http://www.acronymfinder.com/Proxy-Authentication-Required-(HTTP-status-code)-(407).html">http://www.acronymfinder.com/Proxy-Authentication-Required-(HTTP-status-code)-(407).html

Proxy Authentication Required (HTTP status code)

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

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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) HTTP Web Error 401 - Authorization Required 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)		Request Timeout (HTTP status code) Conflict (HTTP status code) 40th Infantry Division (Mechanized) Traffic Accident - Private Property (Alabama Public Safety Radio Code) Gone (HTTP status code; permanently deleted, similar to 404) Length Required (HTTP status code) Local Telephone Information (United States) Precondition Failed (HTTP status code) Request Entity Too Large (HTTP status code) Request Too Long (HTTP status code)