add router.request_context.base_url to cookbook entry

cookbook/console/generating_urls.rst

@@ -19,10 +19,21 @@ and per Command.
 Configuring the Request Context globally
 ----------------------------------------
 
+.. versionadded: 2.1
+
+    The host and scheme parameters are available since Symfony 2.1
+
+.. versionadded: 2.2
+
+    The base_url parameter is available since Symfony 2.2
+
 To configure the Request Context - which is used by the URL Generator - you can
 redefine the parameters it uses as default values to change the default host
-(localhost) and scheme (http). Note that this does not impact URLs generated
-via normal web requests, since those will override the defaults.
+(localhost) and scheme (http). Starting with Symfony 2.2 you can also configure
+the base path if Symfony is not running in the root directory.
+
+Note that this does not impact URLs generated via normal web requests, since those 
+will override the defaults.
 
 .. configuration-block::
 
@@ -32,6 +43,7 @@ via normal web requests, since those will override the defaults.
         parameters:
             router.request_context.host: example.org
             router.request_context.scheme: https
+            router.request_context.base_url: my/path
 
     .. code-block:: xml
 
@@ -44,6 +56,7 @@ via normal web requests, since those will override the defaults.
             <parameters>
                 <parameter key="router.request_context.host">example.org</parameter>
                 <parameter key="router.request_context.scheme">https</parameter>
+                <parameter key="router.request_context.base_url">my/path</parameter>
             </parameters>
         </container>
 
@@ -52,6 +65,7 @@ via normal web requests, since those will override the defaults.
         // app/config/config_test.php
         $container->setParameter('router.request_context.host', 'example.org');
         $container->setParameter('router.request_context.scheme', 'https');
+        $container->setParameter('router.request_context.base_url', 'my/path');
 
 Configuring the Request Context per Command
 -------------------------------------------
@@ -69,6 +83,7 @@ service and override its settings::
             $context = $this->getContainer()->get('router')->getContext();
             $context->setHost('example.com');
             $context->setScheme('https');
+            $context->setBaseUrl('my/path');
 
             // ... your code here
         }