[FrameworkBundle] Configure RequestContext through router config

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php

@@ -482,6 +482,15 @@ class Configuration implements ConfigurationInterface
                             ->defaultTrue()
                         ->end()
                         ->booleanNode('utf8')->defaultFalse()->end()
+                        ->arrayNode('context')
+                            ->info('router request context')
+                            ->addDefaultsIfNotSet()
+                            ->children()
+                                ->scalarNode('host')->defaultValue('%router.request_context.host%')->end()
+                                ->scalarNode('scheme')->defaultValue('%router.request_context.scheme%')->end()
+                                ->scalarNode('base_url')->defaultValue('%router.request_context.base_url%')->end()
+                            ->end()
+                        ->end()
                     ->end()
                 ->end()
             ->end()

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php

@@ -854,6 +854,11 @@ class FrameworkExtension extends Extension
         $container->setParameter('request_listener.http_port', $config['http_port']);
         $container->setParameter('request_listener.https_port', $config['https_port']);
 
+        $requestContext = $container->findDefinition('router.request_context');
+        $requestContext->replaceArgument(0, $config['context']['base_url']);
+        $requestContext->replaceArgument(2, $config['context']['host']);
+        $requestContext->replaceArgument(3, $config['context']['scheme']);
+
         if ($this->annotationsConfigEnabled) {
             $container->register('routing.loader.annotation', AnnotatedRouteControllerLoader::class)
                 ->setPublic(false)

src/Symfony/Bundle/FrameworkBundle/Resources/config/routing.xml

@@ -79,10 +79,10 @@
         <service id="Symfony\Component\Routing\RequestContextAwareInterface" alias="router" />
 
         <service id="router.request_context" class="Symfony\Component\Routing\RequestContext">
-            <argument>%router.request_context.base_url%</argument>
+            <argument></argument> <!-- base_url -->
             <argument>GET</argument>
-            <argument>%router.request_context.host%</argument>
-            <argument>%router.request_context.scheme%</argument>
+            <argument></argument> <!-- host -->
+            <argument></argument> <!-- scheme -->
             <argument>%request_listener.http_port%</argument>
             <argument>%request_listener.https_port%</argument>
         </service>

src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php

@@ -413,6 +413,11 @@ class ConfigurationTest extends TestCase
                 'https_port' => 443,
                 'strict_requirements' => true,
                 'utf8' => false,
+                'context' => [
+                    'host' => '%router.request_context.host%',
+                    'scheme' => '%router.request_context.scheme%',
+                    'base_url' => '%router.request_context.base_url%',
+                ],
             ],
             'session' => [
                 'enabled' => false,