YouTip

## 404 NOT FOUND! Sorry, the article you requested was not found!! The 404 page is an essential page for any website, carrying the important responsibilities of user experience and SEO optimization. A 404 page is typically returned by the server when a user visits a page that does not exist or has been deleted on the website. If the webmaster does not set up a 404 page, dead links will occur, which is detrimental to search engine indexing when spiders crawl such URLs. ## Origin of 404 Not Found It is said that before the third technological revolution, the Internet took the form of a large central database, which was located in Room 404. At that time, all requests were completed manually. If the requested file was not found in the database, or if the requester wrote the wrong file number, the user would receive a return message: room 404 : file not found. Later