Answers for "enable mod headers apache"

enable mod_headers apache2

#enable directive
sudo a2enmod headers && sudo service apache2 restart

ls /etc/apache2/mods-enabled/ | grep headers.load

#disable directive
sudo a2dismod headers && sudo service apache2 restart

ls /etc/apache2/mods-enabled/ | grep headers.load

apache enable mod headers

sudo a2enmod headers && sudo service apache restart