When the framework cannot find a page as requested, or when a Controller does not exist, a "404 Page not Found" error will be thrown. This will produce a header header('HTTP/1.0 404 Not Found');. The framework will then display a page as displayed in Figure 1.
Note, that not all browsers will show the 404 template. Some browsers, such as Chrome, will display their own 'Page Unavailable' output when they receive a 404 header. This is a feature of the browser and has nothing to do with the framework.
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