func main() {
	// Open appending or create the access log.
	accessLogFile, err := os.OpenFile("access.log", os.O_RDWR|os.O_APPEND|os.O_CREATE, 0666)
	if err != nil {
		log.Fatalf("Error using assess.log: %s", err.Error())
	}
	defer accessLogFile.Close()

	// Create a buffered writer and ensure it is flushed when an interrupt occurs.
	bufferedAccessLogWriter := bufio.NewWriter(accessLogFile)
	c := make(chan os.Signal, 1)
	signal.Notify(c, os.Interrupt)
	go func() {
		<-c
		log.Println("Flushing logs and exiting...")
		bufferedAccessLogWriter.Flush()
		os.Exit(0)
	}()
	
	mux := http.DefaultServeMux
	mux.HandleFunc("/", indexHandler)
	loggingHandler := NewApacheLoggingHandler(mux, bufferedAccessLogWriter)
	server := &http.Server{
		Addr:    ":8000",
		Handler: loggingHandler,
	}
	server.ListenAndServe()
}