The HTTP header includes HTTP status codes to explain “what happened” with the request. Whenever you, or one of your visitors, visit your website, your browser sends a request to the web server and receives back data including something called an HTTP header. A 404 status code does not indicate whether this lack of representation is temporary or permanent the 410 (Gone) status code is preferred over 404 if the origin server knows, presumably through some configurable means, that the condition is likely to be permanent. The 404 (Not Found) status code indicates that the origin server did not find a current representation for the target resource or is not willing to disclose that one exists. Here’s a more complete definition by the Internet Engineering Task Force (IETF): It’s not just posts or pages either, any asset missing can generate a 404 error on the server, such as a missing image file, missing JavaScript, missing CSS, etc.
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