Usually, when someone requests a page that doesn't exist, a server will return a 404 (not found) error. This HTTP response code clearly tells both browsers and search engines that the page doesn't exist. As a result, the content of the page (if any) won't be crawled or indexed by search engines.
The 404 or Not Found error message is a HTTP standard response code, in computer network communications, to indicate that the client was able to communicate with a given server, but the server could not find what was requested.
A ‘Soft 404’ error occurs when a non-existent page (a page that has been deleted/removed) displays a ‘page not found’ message to anyone trying to access it, but fails to return a HTTP 404 status code.
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