main-producer.go

func producer(total int) chan *http.Request {
	queue := make(chan *http.Request)
	// make sure that this the for-loop is run using goroutine
	// otherwiser, it will block
	go func() {
		for i := 0; i < total; i++ {
			// ignore error assuming that the request valid
			req, _ := http.NewRequest("GET", "http://localhost:9000", nil)
			queue <- req
		}
		// close the channel when then number of generated requests reaches total
		close(queue)
	}()
	return queue
}