You click a link and get a curt ‘404 Not Found,’ and your stomach drops. Did you break something? Almost certainly not. It’s one of the most harmless errors online.
You click a link, and instead of the page you wanted, you get a curt little message: 404 Not Found. Your stomach drops slightly. Did you break something? Is your computer broken? Almost certainly not. A 404 is one of the most harmless errors on the internet, and it is not your fault.
A 404 means the address was found, but there is nothing at it. The web server is fine, your device is fine. The specific page you asked for just is not there.
Here is the whole thing. Imagine giving a delivery driver a perfectly correct street address. They drive there with no trouble, pull up out front, and find an empty lot where the house used to be. The address was real. The directions worked. There is simply nothing there anymore.
That is a 404. Your browser successfully reached the right website, and the website answered, “I looked, and I do not have a page at that spot.” Maybe the page was deleted, maybe it was moved, maybe the link had a typo in it, or maybe it was renamed and the old address stopped pointing anywhere. The building was torn down; the mailman still found the lot.
A 404 is not “the internet is broken.” It is “this exact page is not here.” The address worked. The page did not.
This is worth telling apart from a different error you have surely seen: “This site cannot be reached.” That one usually means your browser could not even find the building, which is a naming problem: the job of DNS, the internet’s contacts list. A 404 is the opposite: it found the building perfectly, walked up to the door, and found the room empty.
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