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What's the difference? The list of 40x error codes is quite long, but the ones we are interested in are really only 404 and the much less common 410. What is behind their names? A 404 response code means that the resource (URL) was not found. The 410 code, on the other hand, indicates that the resource has been permanently deleted and is not expected to return. In practice – if we permanently delete a subpage ourselves, usually (not always, but more on that in a moment) it is better to redirect it to another resource or at least to the home page.
  
Why is it important? There is one major reason to be concerned about this. Links that point to 404 pages are not considered by Google. This was confirmed on Twitter by Gary Illyes in 2015: twitter/methode/status/629654083469737984 Moreover, the above statement also applies to the so-called. fake 404 errors, i. when the server returns a 200 response code and the user receives china phone number list an error page. on Illyes' Twitter account: twitter/methode/status/630660146679652353 So, as you can tell from the tweets - ignoring the topic of 404 errors can lead to the loss of a really large amount of good quality links.



The scale of the potential problem tends to increase with the age and size of the site. A good example to illustrate the problem can be an online store. In e-commerce sites, it is quite common practice to remove products along with their withdrawal from the offer or prolonged unavailability. On the one hand, it's understandable, because why show users something that I can't buy anyway, but on the other hand, by simply removing a subpage, we lose its "power". While in terms of UX this is not a problem - a good error page can stop the user and direct him to other parts of the store, all the "link juice" evaporates.