404代表甚麼？

錯誤碼 錯誤訊息

400 錯誤的要求
401.1 登入失敗
401.2 因伺服器設定問題造成登入失敗
401.3 由於來源的 ACL 問題而未授權
401.4 篩選器授權失敗
401.5 ISAPI/CGI 應用程式授權失敗
403.1 禁止執行存取
403.2 禁止讀取存取
403.3 禁止寫入存取
403.4 需要 SSL
403.5 需要 SSL 128 位元加密
403.6 IP 位址被拒絕
403.7 需要用戶端憑證
403.8 拒絕存取站台
403.9 太多的使用者
403.10 無效的設定
403.11 密碼變更
403.12 對應程式拒絕存取
403.13 用戶端憑證已撤銷
403.14 目錄清單被拒絕
403.15 超過用戶端存取授權數
403.16 用戶端憑證不被信任或者無效
403.17 用戶端憑證已經過期或者無效
404 找不到
404.1 找不到網站
405 系統不允許此方法
406 無法接受
407 需要 Proxy 驗證
412 先決條件失敗
414 要求的 URI 太長
500 內部伺服器錯誤
500.12 應用程式正在重新啟動
500.13 伺服器太忙碌
500.15 不允許 Global.asa 的要求
500-100.asp ASP 錯誤
501 未執行
502 不正確的閘道

The 404 or Not Found error message is an HTTP standard response code indicating that the client was able to communicate with the server, but the server either could not find what was requested, or it was configured not to fulfill the request and not reveal the reason why.

In the code 404, the first 4 indicates a client error, such as a mistyped URL. The following two digits indicate the specific error encountered.Each response code has an associated string of English text that must also be present.

A 404 error is often returned when pages have been moved or deleted.

Some websites report a ﹝not found﹞error by returning a standard web page with a ﹝200 OK﹞ response code; this is called a soft 404. Soft 404s are problematic for automated methods of discovering if a link is broken or not. A heuristic for identifying soft 404s was given by Bar-Yossef, et al.

In July 2004, the UK telecom provider BT Group implemented the Cleanfeed content blocking system, which returns a 404 error to any request for content identified as illegal by the Internet Watch Foundation. Governments that censor the Internet also often return a fake 404 error when a user tries to access a blocked website.

http://en.wikipedia.org/wiki/404_error

係 http 協定ge error code