fix listener prefix to force ipv4 localhost connection

SimpleHttpServer/HttpServer.cs

@@ -24,7 +24,7 @@ public sealed class HttpServer {
         Port = port;
         conf = configuration;
         listener = new HttpListener();
-        listener.Prefixes.Add($"http://localhost:{port}/");
+        listener.Prefixes.Add($"http://127.0.0.1:{port}/");
         mainLogger = new(LogOutputTopic.Main, conf);
         requestLogger = new(LogOutputTopic.Request, conf);
     }