Add a cookbook entry about url trailing slash redirect

cookbook/index.rst

@@ -13,5 +13,6 @@ The Cookbook
     creating_cms_using_cmf_and_sonata
     using_blockbundle_and_contentbundle
     handling_multilang_documents
+    redirect_urls_with_trailing_slash
 
 .. include:: map.rst.inc

cookbook/map.rst.inc

@@ -12,3 +12,4 @@
 * :doc:`creating_cms_using_cmf_and_sonata`
 * :doc:`using_blockbundle_and_contentbundle`
 * :doc:`handling_multilang_documents`
+* :doc:`redirect_urls_with_trailing_slash`

cookbook/redirect_urls_with_trailing_slash.rst

@@ -0,0 +1,76 @@
+.. index::
+    single: Redirect URLs with a trailing slash
+
+Redirect URLs with a trailing slash
+===================================
+
+The goal of this tutorial is to demonstrate how to redirect URLs with
+trailing slash to the same url without trailing slash
+(for example ``/en/blog/`` to ``/en/blog``).
+
+.. note::
+
+    For the moment, the :doc:`RoutingBundle <../bundles/routing/introduction>`
+    can't achieve this automatically.
+
+You have to create a controller which will match any URL with a trailing
+slash, remove the trailing slash (keeping query parameters if any) and
+redirect to new URL with a 301 response status code::
+
+    // src/Acme/DemoBundle/Controller/RedirectingController.php
+    namespace Acme\DemoBundle\Controller;
+
+    use Symfony\Bundle\FrameworkBundle\Controller\Controller;
+    use Symfony\Component\HttpFoundation\Request;
+
+    class RedirectingController extends Controller
+    {
+        public function removeTrailingSlashAction(Request $request)
+        {
+            $pathInfo = $request->getPathInfo();
+            $requestUri = $request->getRequestUri();
+
+            $url = str_replace($pathInfo, rtrim($pathInfo, ' /'), $requestUri);
+
+            return $this->redirect($url, 301);
+        }
+    }
+
+And after that, register this controller to be executed whenever a url
+with a trailing slash is requested:
+
+.. configuration-block::
+
+    .. code-block:: yaml
+
+        remove_trailing_slash:
+            path: /{url}
+            defaults: { _controller: AcmeDemoBundle:Redirecting:removeTrailingSlash }
+            requirements:
+                url: .*/$
+                _method: GET
+
+
+    .. code-block:: xml
+
+        <?xml version="1.0" encoding="UTF-8" ?>
+        <routes xmlns="http://symfony.com/schema/routing">
+            <route id="remove_trailing_slash" path="/{url}">
+                <default key="_controller">AcmeDemoBundle:Redirecting:removeTrailingSlash</default>
+                <requirement key="url">.*/$</requirement>
+                <requirement key="_method">GET</requirement>
+            </route>
+        </routes>
+
+    .. code-block:: php
+
+        use Symfony\Component\Routing\RouteCollection;
+        use Symfony\Component\Routing\Route;
+
+        $collection = new RouteCollection();
+        $collection->add('remove_trailing_slash', new Route('/{url}', array(
+            '_controller' => 'AcmeDemoBundle:Redirecting:removeTrailingSlash',
+        ), array(
+            'url' => '.*/$',
+            '_method' => 'GET',
+        )));

index.rst

@@ -143,6 +143,7 @@ Want to know more about the CMF and how each part can be configured? There's a t
     cookbook/handling_multilang_documents
     cookbook/installing_configuring_doctrine_phpcr_odm
     cookbook/using_blockbundle_and_contentbundle
+    cookbook/redirect_urls_with_trailing_slash
 
 Contributing
 ------------