Thank you all for your answers 
I have copied my 001-oceanwars.fr.conf to a 002-oceanwars.fr.conf
I have changed the vhost port of 002-oceanwars.fr.conf to be 443 and removed all lines of 001-oceanwars.fr.conf that are about ssl.
Now I can connect with https to my server, thank you
But I have another question, how can I remove http access to my server (I mean to force users to use https instead of http).
Because now you can still access using http to my server 