Depending on the network topology necessary in each situation, it is possible to need a proxy or an HTTP request balancer, it is not necessary to have millions of requests for such a need, it can simply be because there are several web servers (IIS, Apache, Lighthttpd, …) and the intention is to hide this topology from the client by launching everything on port 80.

To do this we will configure a server that receives the requests and redirects them to the corresponding computer. First from Apache 2 the proxy module must be enabled, in Debian for example it would be: