The HTTP 404, 404 Not Found, 404 Error, Page Not Found, or File Not Found error message in computer network communications denotes that the browser was able to communicate with a certain server but that server was unable to locate what was requested. The error can also be used when a server won't admit to having the requested data or not.
When a user tries to follow a broken or dead link, the website hosting server will often generate a "404 Not Found" web page; thus, the 404 error is one of the most well-known problems on the Internet.
The page will look like this,
If you wish you can directly download HTML files you can visit this link.