Blue and white snow mountain background 404 website template

The 404 page is a page returned when the client is browsing the web and the server cannot provide information normally, or the server cannot respond and the reason is unknown. It is said that before the third technological revolution, the form of the Internet was a large central database, and this database was set up in Room 404. At that time, all requests were completed manually. If the file required by the requester was not found in the database, or the requester wrote the wrong file number, the user would get a return message: room 404: file not found. . The 404 error message is usually a page displayed after the target page has been changed or removed, or the client enters an incorrect page address. People are accustomed to using 404 as the error code for a file not found on the server. Of course, actual research has shown that the legendary room 404 does not exist. In the 3-digit return code of the http request, the number beginning with 4 represents a client error, and the number beginning with 5 represents a server-side error.