Error 404 (Not found) - The document is currently unavailable. The server does not find a document matching the requested URI. It is not specified whether permanent or temporary access is not available. This status is usually sent when it is impossible to communicate the exact cause of the failure and no more accurate answer is applicable. If you know that the document at this address no longer exists, the server must send 410 Gone instead. The standard HTTP response code is that the client was able to communicate with the server, but the server can not find the data according to the request. The error 404 should not be confused with the error "Server not found" or other errors indicating access restriction to the server. Error 404 means that the requested resource can be accessed in the future, but that does not guarantee the existence of the previous content. Users most often encounter a 404 error when visiting so-called. Broken or dead links, thus making error 404 one of the most recognizable errors on the Internet
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