Firefox has no built-in default 404 display, so if your PHP script sends no HTML output in addition to the 404 header, nothing will be displayed by the browser.Internet Explorer on the other hand uses a default informative 404 page if there is no HTML content returned along with the 404 header.Apache's 404 configuration only applies to plain old .html files that haven't been handled by a filter (e.g. PHP).
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