What is a 404 Error?

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What is a 404: page not found error?

There is actually a popular story behind the origin of 404.

As per the story, back in the day when the world wide web was still the internal network of CERN, the central database was located on the 4th floor of a building in room 404.

File requests were handled manually. And if the requested file was not found then the message id: “Room 404: file not found” was sent.

When the database was automated message id was updated and room was dropped resulting in just "404: file not found”. Which we still see today.

What a cool back story.

This is actually a popular myth and there is no room 404 at CERN.

404 is actually an error of the 4xx client error class. The xx part defines the particular error, which in this case is 04.

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Cometstarmoon @ Flickr
Gustavo da Cunha Pimenta @Flickr
Joan CG @ Flickr
lee leblanc @ Flickr
Azlan DuPree @ Flickr

The world is vague. It tells only one-half of a story.

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I have 404phobia because I travel to China a lot!

clep
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I tried to Subscibe to a Channel on my YouTube app on my phone and it brought up the 404 error. So what the hell does that mean? Is my my end or theirs or the YouTube app itself?

understandthat
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Thank you. I've always windered this😊

Rebtebganes
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I sometimes get a "there was a problem with the network (404)" error when I click the notification bell in my YouTube app.... Any ideas why?

markorollo.
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The production quality and the number of subscribers do not match... :).

Richard_is_cool