Host-connection-pool.min-connections property with positive value

Here is the quote from docs of akka-http configurartion:

If the number of connections is falling below the given threshold, new ones are being spawned.

My question is connections with WHO are spawned at the moment of server’s start if I specify host-connection-pool.min-connections setting’s value to 5, for instance?
if at the start server doesn’t know if there will be any hosts establishing connections with it

It is created on the first request to a given host, immediately creating min-connections connections to it and keeping that many connections alive.