To enable Poison Fountain for Apache on RHEL/CentOS, copy the poison_fountain.conf file in this gist
to /etc/httpd/conf.d/poison_fountain.conf
(if you've already configured mod_proxy then omit the two LoadModule lines).
Then tell SELinux that apache is allowed to make outbound http requests by running:
setsebool -P httpd_can_network_connect on
Then restart apache: