Add a feature switch to reachability

config.php.example

@@ -5,3 +5,5 @@ $state_file = "state.json"; // The location for the state file. If it does not e
 $error_reporting = false; // Whether PHP errors should be shown. Not recommended for production.
 
 $lobby_timeout_seconds = 30; // How long it should take for unresponsive lobbies to get auto-delisted.
+
+$check_reachability = true; // Whether to reach out to the lobby listing host to confirm the lobby is reachable.

index.php

@@ -30,6 +30,7 @@ if ($error_reporting) {
 
 $reachable = false;
 if (isset($_GET["new"])) {
+  if ($check_reachability) {
     require "enet_probe.php";
     $host = $_SERVER['REMOTE_ADDR'];
     if (!empty($_GET["host"])) {
@@ -40,6 +41,10 @@ if (isset($_GET["new"])) {
       $port = intval($_GET["port"]);
     }
     $reachable = enet_probe($host, $port);
+  }
+  else {
+    $reachable = true;
+  }
 }
 
 $dirname = dirname($state_file);