Before we head to the solution, let me explain what a regular proxy server is, in case you're not familiar with it.

A proxy server is a server that connects to services on your behalf and forwards all the results to you. After you've set up to route all your traffic through the proxy server, you—as a user—won't notice it's there. Everything will work as usual.

However, service owners only see that a certain machine (the proxy server) is connected to them. If another user uses the same proxy server and the same service as you do, the service owner can't tell the difference and will perceive you as one single user.

Different users connecting through a proxy server appear as one user.

As you can see in the preceding diagram, the service owners just see that someone with an IP of 213.12.12.3 has connected to them.

So, what if we use this on the Docker host? What if we put something in front of all the containers? Depending on which domain name is being requested, this thing will...