<https://forum.mrw.it/threads/errori-php-e-possibile-fare-un-redirect-ad-una-pagina-derrore.45655/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.mrw.it/threads/errori-php-e-possibile-fare-un-redirect-ad-una-pagina-derrore.45655/#post-177576>