You may be aware that one of the many foundation, best-practise points recommended by search engine optimisation experts is to have your own customised error page. An error page is the page of content presented, when an error has occurred in trying to access or locate content on your website. In this case we are talking about when content does not exist or cannot be found, but has been requested and ‘heard’ by the server. Search engine professionals and web agencies may often refer to this as a ‘404′. (404 being one of the Http codes for errors of this nature, though there are others.)