# 404 404 is the HTTP status code servers return when a page can't be found, but the number leaked out of tech circles and became slang for anyone or anything absent, missing, or clueless. Custom 404 error pages, the xkcd URL joke, and 4chan phrases like 'in b4 404' kept the code embedded in internet humor. ## Overview "404" started as the HTTP status code a server returns when it cannot find the requested resource, paired with the reason phrase "File Not Found"[4]. Off the web, the number became slang for someone who is absent, out of it, or clueless, and the BBC listed "404" among current British slang meaning "clueless"[1]. The code sits in the 4xx family of client-side errors next to 401 Unauthorized and 403 Forbidden. Developers turned the default error screen into a canvas. Cataloguing sites like the 404 Research Lab tracked the most creative custom pages, with imitations of the Internet Explorer 6 error layout circulating as "Last Page of the Internet" gags[3]. Urban Dictionary defined a "404" as a person who is "not there" or not doing their job well, which showed how the slang usage crossed into everyday speech[6]. ## How It Spread 4chan gave the meme a distinctly online life. Threads that expire on the site get replaced with a 404 error, which produced the community phrase "in b4 404," meaning to post in a thread before it disappears[4]. The site historically served a random picture of its mascot Yotsuba when a 404 error occurred, and that image sequence gave rise to the "404 girl" spinoff meme. xkcd built its own joke into the URL structure of the comic itself. Comics live at xkcd.com/403 and xkcd.com/405, but xkcd.com/404 intentionally returns a 404 error[2]. A blog called "the other side of the moon" proposed that 404 pages should display listings of missing children, and Scott Hanselman built a working prototype of the idea in HTML and JavaScript[5]. ## How to Use The typical joke pairs "404" with any noun to signal something is missing, as in "sense of humor: 404 not found" or "motivation: file not found." Web developers often build custom 404 pages that swap the plain browser error for a themed graphic, animation, or a rewrite of the classic Internet Explorer 6 layout labelled the "Last Page of the Internet"[3]. ## Frequently Asked Questions ### What is 404? 404 is the HTTP status code returned when a web server cannot find the requested page, paired with the phrase "File Not Found"[4]. Online, the number also became slang for anything absent or missing[1]. ### Where did 404 come from? The status code has been part of the HTTP specification since the early 1990s web, and its slang use grew out of frequent user encounters with the error message[4]. ### What does 404 mean? Beyond the technical error, "404" is used to mean absent, missing, or clueless, and the BBC documented it as British slang for someone who is "not there" mentally[1]. Urban Dictionary echoed this by defining a "404" as a person who isn't doing their job[6]. ### How do you use 404? Pair "404" with any noun to say it's missing, as in "sense of humor: 404 not found." Web developers also treat it as a template for custom error pages with in-jokes, art, or animations[3]. ### Is 404 still popular? 404 is still a classic reference point in internet culture. Custom 404 pages, xkcd's intentional error at xkcd.com/404, and 4chan sayings like "in b4 404" keep the code in regular circulation[2]. ## References 1. [https://news.bbc.co.uk]() 2. [https://xkcd.com/404/]() 3. [http://404lab.com]() 4. [https://knowyourmeme.com/memes/404]() 5. [https://www.hanselman.com]() 6. [https://www.urbandictionary.com/define.php?term=404]() --- Source: https://meme.com/memes/404 Published by meme.com — The Internet Meme Library