add ability to close connection for serve-host

test/images/serve-hostname/VERSION

@@ -1 +1 @@
-1.1
+1.2

test/images/serve-hostname/serve_hostname.go

@@ -33,6 +33,7 @@ var (
 	doTCP   = flag.Bool("tcp", false, "Serve raw over TCP.")
 	doUDP   = flag.Bool("udp", false, "Serve raw over UDP.")
 	doHTTP  = flag.Bool("http", true, "Serve HTTP.")
+	doClose = flag.Bool("close", false, "Close connection per each HTTP request")
 	port    = flag.Int("port", 9376, "Port number.")
 )
 
@@ -88,6 +89,12 @@ func main() {
 	if *doHTTP {
 		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 			log.Printf("HTTP request from %s", r.RemoteAddr)
+
+			if *doClose {
+				// Add this header to force to close the connection after serving the request.
+				w.Header().Add("Connection", "close")
+			}
+
 			fmt.Fprintf(w, "%s", hostname)
 		})
 		go func() {