composer require symfony/web-server-bundle ^3.4 --dev

app/AppKernel.php

@@ -23,6 +23,7 @@ class AppKernel extends Kernel
         if (in_array($this->getEnvironment(), array('dev', 'test'))) {
             $bundles[] = new Symfony\Bundle\DebugBundle\DebugBundle();
             $bundles[] = new Symfony\Bundle\WebProfilerBundle\WebProfilerBundle();
+            $bundles[] = new Symfony\Bundle\WebServerBundle\WebServerBundle();
             $bundles[] = new Sensio\Bundle\DistributionBundle\SensioDistributionBundle();
         }
 

composer.json

@@ -22,6 +22,8 @@
         "theodordiaconu/geshi-bundle" : "dev-master",
         "doctrine/doctrine-migrations-bundle": "^2.0",
         "doctrine/annotations": "^1.3"
+    },"require-dev": {
+        "symfony/web-server-bundle": "^3.4"
     },
     "scripts": {
         "symfony-scripts": [

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "0fd5719d627e44d5448f01b2c5b4aaff",
+    "content-hash": "dbd7fba6087be4cdbef515a94ab5b0b0",
     "packages": [
         {
             "name": "composer/ca-bundle",