diff --git a/index.php b/index.php
index c77f6c48..9121e59e 100644
--- a/index.php
+++ b/index.php
@@ -1,4 +1,9 @@
 <?php
+// for build-in php server serve the requested resource as-is.
+if (php_sapi_name() == 'cli-server' && preg_match('/\.(?:png|jpg|jpeg|gif|css|js)$/', $_SERVER["REQUEST_URI"])) {
+    return false;
+}
+
 session_start();
 
 //set php ini so the page doesn't time out for long requests