404

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العربية الفصحى
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/ˌfɔr oʊ ˈfɔr/
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A web not-found code that also became playful slang for missing things, ignorance, and sometimes an uninformed person.
Practice using 404 in conversation until it feels natural

Examples

  • The promised attachment is 404 in the email thread.
  • He was completely 404 when the router stopped working.
  • Do not 404 a popular page when a redirect would help visitors.
  • The joke works because the answer is 404, not found.
  • A broken link sent customers to a custom 404 page.

Similar words

unaware
not found error
lost
confused
go missing
idiot
client error
unavailable
not load
dummy

Meanings

Missing web resource

noun
technology
neutral
The HTTP status code, error message, or error page shown when a server cannot find the requested resource or will not say whether it exists.

Examples

  • The browser displayed a 404 after the article was deleted.
  • A broken link sent customers to a custom 404 page.
  • The API returned 404 because the user ID did not exist.
  • Search Console reported dozens of 404s from old product URLs.
  • The old page should return 404 unless there is a clear replacement.

Similar words

404 error
Not Found
HTTP 404
not found error
missing page error
client error

Return a not-found error

verb
technology
informal
To fail to load because a server returns a 404 response, or to make a page produce that response.

Examples

  • The old campaign URL 404ed after the microsite was removed.
  • Several image requests were 404ing in production.
  • Do not 404 a popular page when a redirect would help visitors.
  • The deleted endpoint now 404s instead of leaking data.
  • The documentation link 404ed right before the release.

Similar words

error out
fail
not load
go missing

Missing or clueless

adjective
slang
slang
Missing, unavailable, or unable to find the needed answer, with the web error turned into a joke about absence or ignorance.

Examples

  • My keys are 404 again.
  • He was completely 404 when the router stopped working.
  • The promised attachment is 404 in the email thread.
  • I am 404 on the details, so ask the project lead.
  • The joke works because the answer is 404, not found.

Similar words

missing
unavailable
lost
clueless
unaware
confused

Clueless person

noun
slang
slang
A person treated as stupid, ineffectual, or uninformed, usually as an internet-flavored insult.

Examples

  • Do not call a colleague a 404 in a review.
  • The forum mocked the spammer as a total 404.
  • That joke treats the villain as a 404, all confidence and no clue.
  • He sounded like a 404 when he guessed the password policy.
  • The insult feels dated now, but 404 still appears in old web slang lists.

Similar words

fool
idiotdummy
clueless person
dope

Etymology

From the HTTP status code 404 Not Found, registered for a missing target resource in HTTP. The slang uses extend that not-found idea to ordinary absence and cluelessness, with dictionary evidence from the late 1990s onward.

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