404 Not Found
(Redirected from 404 error)Mozilla Firefox displaying an Apache HTTP Server 404 error page. Netscape Navigator displaying the 404 error page at eBay. Internet Explorer comes configured to "Show friendly HTTP error messages" which replace the server's normal error messages. Safari showing a 404 error from Wikipedia. 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 the file that was requested, or it was configured not to fulfill the request and not reveal the reason why.
When communicating via HTTP, a server is required to respond to a request, such as a web browser's request for an HTML document (web page), with a numeric response code, sometimes followed by an email-like MIME message. The 404 Research Lab is committed to improving the internet experience through
the eradication of ugly and confusing 404 Not Found errors. Each response code has an associated string of English text that must also be present. Response code 404's associated string is "Not Found". When sending a 404 response, web servers usually include in the response message a short HTML document that mentions both the numeric code and this string. Many browsers opt to show this message to the user, while some browsers instead display a "friendlier" error message.
HTTP response codes have a specific interpretation. In code 404, the first "4" indicates a client error, such as a mistyped URL. We're very sorry, but the page you tried was not found.