Balancer is the reverse proxy server that balances requests.

Config models the configuations that is available for the balancer.

Pool is an interface for pools with different strategies of distributing work.

leastBusy is a scheduling strategy that looks at the amount of work that the workers have and schedules jobs to the least busy worker.

roundRobin is strategy of scheduling that distributes work by providing the same amount of work to all workers.

sleepHandler simulates a route that does work by sleeping.

sleepRequest defines for long to sleep.