diff --git a/app/app.go b/app/app.go
index 4d8be5b..99c3a2a 100644
--- a/app/app.go
+++ b/app/app.go
@@ -201,6 +201,7 @@ func (app *App) generateHandler() func(w http.ResponseWriter, r *http.Request) {
 
 		go func() {
 			<-exit
+			fio.Write([]byte{4})
 			fio.Close()
 			conn.Close()
 			log.Printf("Connection closed: %s", r.RemoteAddr)