What is a 404 page?

Answer 1

In 1992, Tim Berners-Lee defined all the HTTP (Hypertext Transfer Protocol) codes based on the FTP (File Transfer Protocol) status codes. If you break it down, the first 4 indicates the error is a client error, the 0 indicates a general syntax error, and the final 4 refers to the specific error code in the 4xx group of error codes. In total there are 17 error codes in the 4xx group.

Answer 2

404 Not Found: This is perhaps the most well-known 4xx error. It occurs when the server cannot find the requested resource.

401 Unauthorized: This error arises when the user needs to provide proper authentication, such as a username and passw0rd, to access the requested resource.

403 Forbidden: This error indicates that the server understands the request, but it refuses to authorize access to the requested resource.

400 Bad Request: This error is generated when the server cannot process the request due to a client error, often due to malformed or invalid syntax.