xxxxxxxxxx
#edit
#CentOS/Fedora:
$ sudo vi /etc/httpd/conf/httpd.conf
#Ubuntu/Debian:
$ sudo vi /etc/apache2/apache2.conf
# add or modify
ServerSignature Off
ServerTokens Prod
# restart the service
$ sudo systemctl restart apache2 #SystemD
$ sudo service apache2 restart #SysVInit