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📅 2026-06-19 | 📂 JavaScript
```html Page Not Found | Rookie Tutorial

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404 NOT FOUND!

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The 404 page is an essential part of any website, carrying significant responsibility for user experience and SEO optimization. A 404 page typically appears when a user visits a non-existent or deleted page on the site, resulting in a server returning a 404 error. If the webmaster does not set up a 404 page, dead links will occur, which can negatively impact search engine indexing when crawlers access such URLs.

Origin of 404 Not Found

Legend has it that before the Third Industrial Revolution, the form of the internet was a large central database located in Room 404. At that time, all requests were manually handled by people. If the requested file could not be found in the database, or if the requester had written the wrong file number, users would receive a return message: room 404 : file not found. After the rise of the internet, people became accustomed to using 404 as the error code for files not found on servers. Of course, historical verification shows that the legendary Room 404 never actually existed.

Two Major Benefits of Setting Up a 404 Page

  • Guide users not to close the website, enhancing user experience.
  • Prevent the appearance of dead links on the website.

See more Introduction to HTTP Status Codes.

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