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404 is an HTTP status code. When you visit a web page, your computer is requesting data from a server using Hypertext Transfer Protocol (HTTP).

Before the web page is displayed, your browser sends the web server its HTTP header. The server responds with its HTTP header, which contains [the status] code.

For a normal web page, [the status] is 200 (OK). You don't see this because the server just sends you [the content] of the page.

If you encounter an error, then you see the actual status code, such as 404 Not Found.

The first 4 indicates a client error. The server is saying that you've done something wrong, such as misspell the URL or request a page which is no longer there. (For comparison, a 5xx error indicates a server-side problem, which may be transient; if you try it again, it may work.)

The middle 0 refers to a general syntax error. This could indicate a spelling mistake.

The last 4 just indicates the specific error in the 40x group, which also includes 400: Bad Request, 401: [Unauthorized], etc.

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