Install and enable apache2 proxy modules
proxies all requests (“/”) to a single backend:
to point to the reverse proxy, instead of back to itself, the ProxyPassReverse directive is most often required:
Only specific URIs can be proxied
Example
ServerName example.net Documentroot /var/www/html/
ProxyPass “/” “http://www.example.com/" ProxyPassReverse “/” “http://www.example.com/"
</VirtualHost>