You likely don't want to use a state machine to manage the state of the application here, but there are many other places a state machine comes in handy. If one

You likely don't want to use a state machine to manage the state of the application here, but there are many other places a state machine comes in handy. If one of your models has several boolean variables, it may benefit from a state machine. Even HTTP parsing itself is often done with a state machine. None of those impact the statelessness of the connections.