Minor cleanup and improve cli doc

main.go

@@ -19,8 +19,10 @@ var html []byte
 
 func main() {
 
-	addr := flag.String("address", "localhost:3242", "See go.balki.me/anyhttp for usage")
-	dumpFile := flag.String("dumpfile", "dump.json", "local storage file path")
+	addr := flag.String("address", "localhost:3242", "Listen address. See go.balki.me/anyhttp for usage")
+	dumpFile := flag.String("dumpfile", "dump.json", "Path where local storage is saved in server")
+
+	flag.Parse()
 
 	http.HandleFunc("/", func(w http.ResponseWriter, _ *http.Request) {
 		w.Write([]byte("<h2>Error!</h2><p>Check your webserver config, You should not see this!</p>"))
@@ -32,9 +34,6 @@ func main() {
 
 	http.HandleFunc("/wrap/saveLS", func(w http.ResponseWriter, r *http.Request) {
 
-		if _, err := w.Write([]byte("OK")); err != nil {
-			log.Panic(err)
-		}
 		data, err := io.ReadAll(r.Body)
 		if err != nil {
 			log.Panic(err)
@@ -49,12 +48,16 @@ func main() {
 		}
 
 		log.Println("Saved!")
+
+		if _, err := w.Write([]byte("OK")); err != nil {
+			log.Panic(err)
+		}
 	})
 
 	http.HandleFunc("/wrap/loadLS", func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Content-Type", "application/json")
 		data, err := os.ReadFile(*dumpFile)
-		if err != nil {
+		if err != nil { // First time
 			data = []byte("{}")
 		}
 		if _, err := w.Write(data); err != nil {
@@ -62,6 +65,7 @@ func main() {
 		}
 		log.Println("Sent!")
 	})
+
 	err := anyhttp.ListenAndServe(*addr, nil)
 	if err != nil {
 		log.Panic(err)