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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. 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
HTTP response codes have a specific interpretation. In code 404, the first "4" indicates a client error, such as a mistyped URL . The following two digits indicate the specific error encountered. HTTP's use of three-digit codes is similar to the use of such codes in earlier protocols such as FTP and NNTP .