diff --git a/src/aphront/site/PhabricatorResourceSite.php b/src/aphront/site/PhabricatorResourceSite.php
new file mode 100644
index 0000000000..88f7777607
--- /dev/null
+++ b/src/aphront/site/PhabricatorResourceSite.php
@@ -0,0 +1,41 @@
+<?php
+
+final class PhabricatorResourceSite extends PhabricatorSite {
+
+  public function getDescription() {
+    return pht('Serves static resources like images, CSS and JS.');
+  }
+
+  public function getPriority() {
+    return 2000;
+  }
+
+  public function newSiteForRequest(AphrontRequest $request) {
+    $host = $request->getHost();
+
+    $uri = PhabricatorEnv::getEnvConfig('security.alternate-file-domain');
+    if (!strlen($uri)) {
+      return null;
+    }
+
+    if ($this->isHostMatch($host, array($uri))) {
+      return new PhabricatorResourceSite();
+    }
+
+    return null;
+  }
+
+  public function getRoutingMaps() {
+    $applications = PhabricatorApplication::getAllInstalledApplications();
+
+    $maps = array();
+    foreach ($applications as $application) {
+      $maps[] = $this->newRoutingMap()
+        ->setApplication($application)
+        ->setRoutes($application->getResourceRoutes());
+    }
+
+    return $maps;
+  }
+
+}