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HTTP 404 is a Hypertext Transfer Protocol (HTTP) standard error message response code that simply means "not found," indicating that a Web server is unable to locate the resource requested by a client, usually a Web browser. This is often because of a dead or broken link that has not updated removed or transferred contents to point to the new location. The server then generates a 404 Not Found Web page, which is sent as a notification to the client for the user.