Proxy path Apache domain redirect

Hello,
As you all know, default URL for bonita running application is like: http://Host:8080/bonita, I have a domain that mapped in DNS server to ip, also I used this forum solution to remove bonita part of URL, now I want to discard port number, I used proxypath, here is my 000-default.conf file in /etc/apache2/site-enable/
ProxyPreserveHost on
ProxyRequests off
ServerName www.DOMAIN.ir
serverAlias DOMAIN.ir
ProxyPass / http://IP:8080/
ProxyPassReverse / http://IP:8080/
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html

I also restarted apache and rerun bonita but no change appeared. Would you please tell me how to fix this problem.
best regards.