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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.
If the user does not provide valid credentials or if the authentication fails, a 403 status code is returned. IP restrictions: The server may also restrict access to specific IP addresses or IP ranges. If the user's IP address is not included in the list of permitted addresses, a 403 status code is returned.
This is the most common type of "Beyond 404" dead link. Conceptually, the page does not return 404, but is also not returning the intended content, in-effect a 404 and thus "soft". Methods of Soft-404 detection including foreknowledge, the redirect URL, the page title, and content on the page. Crunchy-404. A URL that falls somewhere between a ...
The source code of the template engine can be proprietary or open source. Many template systems are a component of a larger programming platform or framework. They are referred to as the "platform's template system". Some template systems have the option of substituting a different template language or engine. [citation needed]
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The view-source URI scheme is used by some web browsers to construct URIs that result in the browser displaying the source code of a web page or other web resource. [1]
The following table lists the various web template engines used in Web template systems and a brief rundown of their features. Engine (implementation) [ a ] Languages [ b ]