diff --git a/index.php b/index.php
index 7d291f18..4bf391a1 100644
--- a/index.php
+++ b/index.php
@@ -2,6 +2,7 @@
 
 $dsn = '';
 $clients = [];
+$allow_cors = 0;
 
 /**
 * The MIT License
@@ -544,6 +545,9 @@ public static function Reply($data)
 
 			if (headers_sent() !== true)
 			{
+				if ($allow_cors) {
+					header('Access-Control-Allow-Origin: *');
+				}
 				header(sprintf('Content-Type: application/%s; charset=utf-8', (empty($callback) === true) ? 'json' : 'javascript'));
 			}
 		}