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📅 2026-06-23 | 📂 Python3

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404 NOT FOUND!

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The 404 page is an essential part of any website, playing a crucial role in user experience and SEO optimization. A 404 page is returned by the server when a user tries to access a page that does not exist or has been deleted. If a website owner does not set up a custom 404 page, dead links will appear, which negatively impacts search engine indexing when crawlers encounter such URLs.

Origin of 404 Not Found

It is said that before the Third Industrial Revolution, the internet was essentially a large central database located in room 404. At that time, all requests were manually handled by humans. If the requested file was not found in the database, or if the user entered an incorrect file number, they would receive a response: "room 404: file not found". Later, as the internet became popular, people began using "404" as the standard error code for "file not found" on servers. Of course, in reality, the legendary room 404 never existed.

Two Benefits of Setting a 404 Page

  • Guide users not to leave the site, enhancing user experience.
  • Prevent dead links on your website.

Learn more about HTTP Status Codes.

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