Run puphpet with: APP_ENV=dev php -S 127.0.0.1:8000 -t web/ web/app_dev.php

puphpet_local.patch

diff --git a/web/app_dev.php b/web/app_dev.php
index 453b353..866c46f 100644
--- a/web/app_dev.php
+++ b/web/app_dev.php
@@ -1,12 +1,18 @@
 <?php
 
+$filename = __DIR__.preg_replace('#(\?.*)$#', '', $_SERVER['REQUEST_URI']);
+if (php_sapi_name() === 'cli-server' && is_file($filename)) {
+           return false;
+}
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Debug\Debug;
 
 if (getenv('APP_ENV') !== 'dev') {
     exit;
 }
 
 error_reporting(E_ALL);
 ini_set('display_errors', '1');
 ini_set('opcache.enable', '0');

Ala http://silex.sensiolabs.org/doc/web_servers.html