How do I configure two addresses to access other frontends / different ports, for example:

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Solution to not overkill your Brain in an Example

Apache

<VirtualHost *>
    ServerName www.example.com


    ProxyPass /config http://localname:3000/
    ProxyPassReverse /config http://localname:3000/

    ProxyPass /client http://localname:7000/
    ProxyPassReverse /client http://localname:7000/
</VirtualHost>

Nginx (just in case you may need it)

location /config {
    proxy_pass              http://127.0.0.1:3000;
    proxy_set_header        Host $http_host;
}
location /client {
    proxy_pass              http://127.0.0.1:7000;
    proxy_set_header        Host $http_host;
}