I found a track, so my settings :
Mon adresse est http://xxxx/index.php est affiché">ForceVirtualHost = false ==> My address is displayed http://xxxx/index.php and content / dowload work.
http://xxxx/ (index.php est masqué) et les content/dowload ne fonctionne pas.">ForceVirtualHost = true ==> http://xxxx/ (index.php is hidden) and content / dowload does not work.
I would hide the index.php with the content / download works. :-) Thank you!