diff --git a/src/Extension/UrlExtension.php b/src/Extension/UrlExtension.php
index 91eceec..82082b6 100644
--- a/src/Extension/UrlExtension.php
+++ b/src/Extension/UrlExtension.php
@@ -17,7 +17,7 @@ PATTERN;
 
     protected string $urlBase;
 
-    protected string $appUrl;
+    protected array $appUrl;
 
     protected string $assetToken;
 
@@ -32,7 +32,7 @@ PATTERN;
     #[\Deprecated]
     protected bool $enforceExistingArguments = true;
 
-    public function __construct(string $urlBase = "", string $assetToken = "", string $appUrl = "", bool $forceSSL = false) {
+    public function __construct(string $urlBase = "", string $assetToken = "", array $appUrl = [], bool $forceSSL = false) {
         $this->urlBase = trim($urlBase, "/");
         $this->assetToken = $assetToken;
         $this->appUrl = $appUrl;
@@ -202,7 +202,18 @@ PATTERN;
             $port = $this->isDefaultPort() ? "" : ":" . $_SERVER['SERVER_PORT'];
         }
 
-        return strtolower($this->appUrl ? $this->appUrl . $port : $_SERVER['HTTP_HOST']);
+        return strtolower($this->appUrl($port) ?: $_SERVER['HTTP_HOST']);
+    }
+
+    protected function appUrl(string $port) : string
+    {
+        $domain = strtolower($_SERVER['HTTP_HOST']);
+
+        if (in_array($domain, $this->appUrl)) {
+            return $domain . $port;
+        }
+
+        return $this->appUrl[0] . $port;
     }
 
     protected function isDefaultPort() : bool