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Microsoft's IIS 7.0, IIS 7.5, and IIS 8.0 servers define the following HTTP substatus codes to indicate a more specific cause of a 404 error: 404.0 – Not found. 404.1 – Site Not Found. 404.2 – ISAPI or CGI restriction. 404.3 – MIME type restriction. 404.4 – No handler configured. 404.5 – Denied by request filtering configuration.
This code is also typically used if the request provided authentication by answering the WWW-Authenticate header field challenge, but the server did not accept that authentication. The request should not be repeated. 404 Not Found The requested resource could not be found but may be available in the future.
404 Not Found; 451 Unavailable for Legal Reasons ... This could be a response from the web server: HTTP / 1.1 200 OK Date: Sun, 10 Oct 2010 23:26:07 GMT Server ...
In HTTP/1.0 and since, the first line of the HTTP response is called the status line and includes a numeric status code (such as "404") and a textual reason phrase (such as "Not Found"). The response status code is a three-digit integer code representing the result of the server's attempt to understand and satisfy the client's corresponding ...
The server returns a 426 status code to alert legacy clients that the failure was client-related (400 level codes indicate a client failure). This method for establishing a secure connection is advantageous because it: Does not require messy and problematic URL redirection on the server side;
The cache manifest file is a text file located in another part of the server. It must be served with content type text/cache-manifest [ 7 ] The attribute manifest="<path>" must be added to the html element in order for the cache manifest file to work. [ 7 ]
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