From 4751a732f272f5c4f9e9f48fdceb2352ccbdd9ac Mon Sep 17 00:00:00 2001
From: Olivier Dolbeau <git@a.bbnt.me>
Date: Tue, 31 Mar 2020 23:05:50 +0200
Subject: [PATCH] =?UTF-8?q?[Routing]=C2=A0Deal=20with=20hosts=20per=20loca?=
 =?UTF-8?q?le?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/Symfony/Component/Routing/CHANGELOG.md    |  1 +
 .../Configurator/CollectionConfigurator.php   | 19 +++++++
 .../Configurator/ImportConfigurator.php       | 15 ++++++
 .../Loader/Configurator/RouteConfigurator.php | 15 ++++++
 .../Loader/Configurator/Traits/HostTrait.php  | 49 ++++++++++++++++++
 .../Traits/LocalizedRouteTrait.php            | 13 +++--
 .../Routing/Loader/XmlFileLoader.php          | 41 +++++++++------
 .../Routing/Loader/YamlFileLoader.php         | 23 +++++----
 .../Loader/schema/routing/routing-1.0.xsd     |  2 +
 .../import-with-host-expected-collection.php  | 50 +++++++++++++++++++
 ...th-locale-and-host-expected-collection.php | 50 +++++++++++++++++++
 ...t-with-single-host-expected-collection.php | 32 ++++++++++++
 ...mport-without-host-expected-collection.php | 31 ++++++++++++
 .../Fixtures/locale_and_host/imported.php     | 19 +++++++
 .../Fixtures/locale_and_host/imported.xml     | 19 +++++++
 .../Fixtures/locale_and_host/imported.yml     | 18 +++++++
 .../locale_and_host/importer-with-host.php    | 10 ++++
 .../locale_and_host/importer-with-host.xml    | 10 ++++
 .../locale_and_host/importer-with-host.yml    |  6 +++
 .../importer-with-locale-and-host.php         | 13 +++++
 .../importer-with-locale-and-host.xml         | 12 +++++
 .../importer-with-locale-and-host.yml         |  9 ++++
 .../importer-with-single-host.php             |  7 +++
 .../importer-with-single-host.xml             |  8 +++
 .../importer-with-single-host.yml             |  4 ++
 .../locale_and_host/importer-without-host.php |  7 +++
 .../locale_and_host/importer-without-host.xml |  8 +++
 .../locale_and_host/importer-without-host.yml |  3 ++
 .../Tests/Loader/PhpFileLoaderTest.php        | 40 +++++++++++++++
 .../Tests/Loader/XmlFileLoaderTest.php        | 40 +++++++++++++++
 .../Tests/Loader/YamlFileLoaderTest.php       | 40 +++++++++++++++
 31 files changed, 584 insertions(+), 30 deletions(-)
 create mode 100644 src/Symfony/Component/Routing/Loader/Configurator/Traits/HostTrait.php
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-host-expected-collection.php
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-locale-and-host-expected-collection.php
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-single-host-expected-collection.php
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-without-host-expected-collection.php
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.php
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.xml
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.yml
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.php
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.xml
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.yml
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.php
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.xml
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.yml
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.php
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.xml
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.yml
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.php
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.xml
 create mode 100644 src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.yml

diff --git a/src/Symfony/Component/Routing/CHANGELOG.md b/src/Symfony/Component/Routing/CHANGELOG.md
index b0f2f0e8d2..267372eb82 100644
--- a/src/Symfony/Component/Routing/CHANGELOG.md
+++ b/src/Symfony/Component/Routing/CHANGELOG.md
@@ -11,6 +11,7 @@ CHANGELOG
  * deprecated the `RouteCompiler::REGEX_DELIMITER` constant
  * added `ExpressionLanguageProvider` to expose extra functions to route conditions
  * added support for a `stateless` keyword for configuring route stateless in PHP, YAML and XML configurations.
+ * added the "hosts" option to be able to configure the host per locale.
 
 5.0.0
 -----
diff --git a/src/Symfony/Component/Routing/Loader/Configurator/CollectionConfigurator.php b/src/Symfony/Component/Routing/Loader/Configurator/CollectionConfigurator.php
index 79c1100a82..1d93ca5f6f 100644
--- a/src/Symfony/Component/Routing/Loader/Configurator/CollectionConfigurator.php
+++ b/src/Symfony/Component/Routing/Loader/Configurator/CollectionConfigurator.php
@@ -20,11 +20,13 @@ use Symfony\Component\Routing\RouteCollection;
 class CollectionConfigurator
 {
     use Traits\AddTrait;
+    use Traits\HostTrait;
     use Traits\RouteTrait;
 
     private $parent;
     private $parentConfigurator;
     private $parentPrefixes;
+    private $host;
 
     public function __construct(RouteCollection $parent, string $name, self $parentConfigurator = null, array $parentPrefixes = null)
     {
@@ -41,6 +43,9 @@ class CollectionConfigurator
         if (null === $this->prefixes) {
             $this->collection->addPrefix($this->route->getPath());
         }
+        if (null !== $this->host) {
+            $this->addHost($this->collection, $this->host);
+        }
 
         $this->parent->addCollection($this->collection);
     }
@@ -86,6 +91,20 @@ class CollectionConfigurator
         return $this;
     }
 
+    /**
+     * Sets the host to use for all child routes.
+     *
+     * @param string|array $host the host, or the localized hosts
+     *
+     * @return $this
+     */
+    final public function host($host): self
+    {
+        $this->host = $host;
+
+        return $this;
+    }
+
     private function createRoute(string $path): Route
     {
         return (clone $this->route)->setPath($path);
diff --git a/src/Symfony/Component/Routing/Loader/Configurator/ImportConfigurator.php b/src/Symfony/Component/Routing/Loader/Configurator/ImportConfigurator.php
index 37996536ed..1841253694 100644
--- a/src/Symfony/Component/Routing/Loader/Configurator/ImportConfigurator.php
+++ b/src/Symfony/Component/Routing/Loader/Configurator/ImportConfigurator.php
@@ -18,6 +18,7 @@ use Symfony\Component\Routing\RouteCollection;
  */
 class ImportConfigurator
 {
+    use Traits\HostTrait;
     use Traits\PrefixTrait;
     use Traits\RouteTrait;
 
@@ -59,4 +60,18 @@ class ImportConfigurator
 
         return $this;
     }
+
+    /**
+     * Sets the host to use for all child routes.
+     *
+     * @param string|array $host the host, or the localized hosts
+     *
+     * @return $this
+     */
+    final public function host($host): self
+    {
+        $this->addHost($this->route, $host);
+
+        return $this;
+    }
 }
diff --git a/src/Symfony/Component/Routing/Loader/Configurator/RouteConfigurator.php b/src/Symfony/Component/Routing/Loader/Configurator/RouteConfigurator.php
index d617403a51..fcb377182e 100644
--- a/src/Symfony/Component/Routing/Loader/Configurator/RouteConfigurator.php
+++ b/src/Symfony/Component/Routing/Loader/Configurator/RouteConfigurator.php
@@ -19,6 +19,7 @@ use Symfony\Component\Routing\RouteCollection;
 class RouteConfigurator
 {
     use Traits\AddTrait;
+    use Traits\HostTrait;
     use Traits\RouteTrait;
 
     protected $parentConfigurator;
@@ -31,4 +32,18 @@ class RouteConfigurator
         $this->parentConfigurator = $parentConfigurator; // for GC control
         $this->prefixes = $prefixes;
     }
+
+    /**
+     * Sets the host to use for all child routes.
+     *
+     * @param string|array $host the host, or the localized hosts
+     *
+     * @return $this
+     */
+    final public function host($host): self
+    {
+        $this->addHost($this->route, $host);
+
+        return $this;
+    }
 }
diff --git a/src/Symfony/Component/Routing/Loader/Configurator/Traits/HostTrait.php b/src/Symfony/Component/Routing/Loader/Configurator/Traits/HostTrait.php
new file mode 100644
index 0000000000..54ae6566a9
--- /dev/null
+++ b/src/Symfony/Component/Routing/Loader/Configurator/Traits/HostTrait.php
@@ -0,0 +1,49 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Routing\Loader\Configurator\Traits;
+
+use Symfony\Component\Routing\RouteCollection;
+
+/**
+ * @internal
+ */
+trait HostTrait
+{
+    final protected function addHost(RouteCollection $routes, $hosts)
+    {
+        if (!$hosts || !\is_array($hosts)) {
+            $routes->setHost($hosts ?: '');
+
+            return;
+        }
+
+        foreach ($routes->all() as $name => $route) {
+            if (null === $locale = $route->getDefault('_locale')) {
+                $routes->remove($name);
+                foreach ($hosts as $locale => $host) {
+                    $localizedRoute = clone $route;
+                    $localizedRoute->setDefault('_locale', $locale);
+                    $localizedRoute->setRequirement('_locale', preg_quote($locale));
+                    $localizedRoute->setDefault('_canonical_route', $name);
+                    $localizedRoute->setHost($host);
+                    $routes->add($name.'.'.$locale, $localizedRoute);
+                }
+            } elseif (!isset($hosts[$locale])) {
+                throw new \InvalidArgumentException(sprintf('Route "%s" with locale "%s" is missing a corresponding host in its parent collection.', $name, $locale));
+            } else {
+                $route->setHost($hosts[$locale]);
+                $route->setRequirement('_locale', preg_quote($locale));
+                $routes->add($name, $route);
+            }
+        }
+    }
+}
diff --git a/src/Symfony/Component/Routing/Loader/Configurator/Traits/LocalizedRouteTrait.php b/src/Symfony/Component/Routing/Loader/Configurator/Traits/LocalizedRouteTrait.php
index 8bd54095f6..4734a4eac0 100644
--- a/src/Symfony/Component/Routing/Loader/Configurator/Traits/LocalizedRouteTrait.php
+++ b/src/Symfony/Component/Routing/Loader/Configurator/Traits/LocalizedRouteTrait.php
@@ -26,13 +26,13 @@ trait LocalizedRouteTrait
      * Creates one or many routes.
      *
      * @param string|array $path the path, or the localized paths of the route
-     *
-     * @return Route|RouteCollection
      */
-    final protected function createLocalizedRoute(RouteCollection $collection, string $name, $path, string $namePrefix = '', array $prefixes = null)
+    final protected function createLocalizedRoute(RouteCollection $collection, string $name, $path, string $namePrefix = '', array $prefixes = null): RouteCollection
     {
         $paths = [];
 
+        $routes = new RouteCollection();
+
         if (\is_array($path)) {
             if (null === $prefixes) {
                 $paths = $path;
@@ -52,13 +52,12 @@ trait LocalizedRouteTrait
                 $paths[$locale] = $prefix.$path;
             }
         } else {
-            $collection->add($namePrefix.$name, $route = $this->createRoute($path));
+            $routes->add($namePrefix.$name, $route = $this->createRoute($path));
+            $collection->add($namePrefix.$name, $route);
 
-            return $route;
+            return $routes;
         }
 
-        $routes = new RouteCollection();
-
         foreach ($paths as $locale => $path) {
             $routes->add($name.'.'.$locale, $route = $this->createRoute($path));
             $collection->add($namePrefix.$name.'.'.$locale, $route);
diff --git a/src/Symfony/Component/Routing/Loader/XmlFileLoader.php b/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
index 5e31d69785..12f437341d 100644
--- a/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
@@ -14,6 +14,7 @@ namespace Symfony\Component\Routing\Loader;
 use Symfony\Component\Config\Loader\FileLoader;
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Config\Util\XmlUtils;
+use Symfony\Component\Routing\Loader\Configurator\Traits\HostTrait;
 use Symfony\Component\Routing\Loader\Configurator\Traits\LocalizedRouteTrait;
 use Symfony\Component\Routing\Loader\Configurator\Traits\PrefixTrait;
 use Symfony\Component\Routing\RouteCollection;
@@ -26,6 +27,7 @@ use Symfony\Component\Routing\RouteCollection;
  */
 class XmlFileLoader extends FileLoader
 {
+    use HostTrait;
     use LocalizedRouteTrait;
     use PrefixTrait;
 
@@ -116,7 +118,7 @@ class XmlFileLoader extends FileLoader
         $schemes = preg_split('/[\s,\|]++/', $node->getAttribute('schemes'), -1, PREG_SPLIT_NO_EMPTY);
         $methods = preg_split('/[\s,\|]++/', $node->getAttribute('methods'), -1, PREG_SPLIT_NO_EMPTY);
 
-        list($defaults, $requirements, $options, $condition, $paths) = $this->parseConfigs($node, $filepath);
+        list($defaults, $requirements, $options, $condition, $paths, /* $prefixes */, $hosts) = $this->parseConfigs($node, $filepath);
 
         $path = $node->getAttribute('path');
 
@@ -128,14 +130,17 @@ class XmlFileLoader extends FileLoader
             throw new \InvalidArgumentException(sprintf('The <route> element in file "%s" must not have both a "path" attribute and <path> child nodes.', $filepath));
         }
 
-        $route = $this->createLocalizedRoute($collection, $id, $paths ?: $path);
-        $route->addDefaults($defaults);
-        $route->addRequirements($requirements);
-        $route->addOptions($options);
-        $route->setHost($node->getAttribute('host'));
-        $route->setSchemes($schemes);
-        $route->setMethods($methods);
-        $route->setCondition($condition);
+        $routes = $this->createLocalizedRoute($collection, $id, $paths ?: $path);
+        $routes->addDefaults($defaults);
+        $routes->addRequirements($requirements);
+        $routes->addOptions($options);
+        $routes->setSchemes($schemes);
+        $routes->setMethods($methods);
+        $routes->setCondition($condition);
+
+        if (null !== $hosts) {
+            $this->addHost($routes, $hosts);
+        }
     }
 
     /**
@@ -155,13 +160,12 @@ class XmlFileLoader extends FileLoader
 
         $type = $node->getAttribute('type');
         $prefix = $node->getAttribute('prefix');
-        $host = $node->hasAttribute('host') ? $node->getAttribute('host') : null;
         $schemes = $node->hasAttribute('schemes') ? preg_split('/[\s,\|]++/', $node->getAttribute('schemes'), -1, PREG_SPLIT_NO_EMPTY) : null;
         $methods = $node->hasAttribute('methods') ? preg_split('/[\s,\|]++/', $node->getAttribute('methods'), -1, PREG_SPLIT_NO_EMPTY) : null;
         $trailingSlashOnRoot = $node->hasAttribute('trailing-slash-on-root') ? XmlUtils::phpize($node->getAttribute('trailing-slash-on-root')) : true;
         $namePrefix = $node->getAttribute('name-prefix') ?: null;
 
-        list($defaults, $requirements, $options, $condition, /* $paths */, $prefixes) = $this->parseConfigs($node, $path);
+        list($defaults, $requirements, $options, $condition, /* $paths */, $prefixes, $hosts) = $this->parseConfigs($node, $path);
 
         if ('' !== $prefix && $prefixes) {
             throw new \InvalidArgumentException(sprintf('The <route> element in file "%s" must not have both a "prefix" attribute and <prefix> child nodes.', $path));
@@ -193,9 +197,10 @@ class XmlFileLoader extends FileLoader
         foreach ($imported as $subCollection) {
             $this->addPrefix($subCollection, $prefixes ?: $prefix, $trailingSlashOnRoot);
 
-            if (null !== $host) {
-                $subCollection->setHost($host);
+            if (null !== $hosts) {
+                $this->addHost($subCollection, $hosts);
             }
+
             if (null !== $condition) {
                 $subCollection->setCondition($condition);
             }
@@ -245,6 +250,7 @@ class XmlFileLoader extends FileLoader
         $condition = null;
         $prefixes = [];
         $paths = [];
+        $hosts = [];
 
         /** @var \DOMElement $n */
         foreach ($node->getElementsByTagNameNS(self::NAMESPACE_URI, '*') as $n) {
@@ -256,6 +262,9 @@ class XmlFileLoader extends FileLoader
                 case 'path':
                     $paths[$n->getAttribute('locale')] = trim($n->textContent);
                     break;
+                case 'host':
+                    $hosts[$n->getAttribute('locale')] = trim($n->textContent);
+                    break;
                 case 'prefix':
                     $prefixes[$n->getAttribute('locale')] = trim($n->textContent);
                     break;
@@ -309,7 +318,11 @@ class XmlFileLoader extends FileLoader
             $defaults['_stateless'] = XmlUtils::phpize($stateless);
         }
 
-        return [$defaults, $requirements, $options, $condition, $paths, $prefixes];
+        if (!$hosts) {
+            $hosts = $node->hasAttribute('host') ? $node->getAttribute('host') : null;
+        }
+
+        return [$defaults, $requirements, $options, $condition, $paths, $prefixes, $hosts];
     }
 
     /**
diff --git a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
index b0718f6838..c62c0abc11 100644
--- a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
@@ -13,6 +13,7 @@ namespace Symfony\Component\Routing\Loader;
 
 use Symfony\Component\Config\Loader\FileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Routing\Loader\Configurator\Traits\HostTrait;
 use Symfony\Component\Routing\Loader\Configurator\Traits\LocalizedRouteTrait;
 use Symfony\Component\Routing\Loader\Configurator\Traits\PrefixTrait;
 use Symfony\Component\Routing\RouteCollection;
@@ -28,6 +29,7 @@ use Symfony\Component\Yaml\Yaml;
  */
 class YamlFileLoader extends FileLoader
 {
+    use HostTrait;
     use LocalizedRouteTrait;
     use PrefixTrait;
 
@@ -137,14 +139,17 @@ class YamlFileLoader extends FileLoader
             $defaults['_stateless'] = $config['stateless'];
         }
 
-        $route = $this->createLocalizedRoute($collection, $name, $config['path']);
-        $route->addDefaults($defaults);
-        $route->addRequirements($requirements);
-        $route->addOptions($options);
-        $route->setHost($config['host'] ?? '');
-        $route->setSchemes($config['schemes'] ?? []);
-        $route->setMethods($config['methods'] ?? []);
-        $route->setCondition($config['condition'] ?? null);
+        $routes = $this->createLocalizedRoute($collection, $name, $config['path']);
+        $routes->addDefaults($defaults);
+        $routes->addRequirements($requirements);
+        $routes->addOptions($options);
+        $routes->setSchemes($config['schemes'] ?? []);
+        $routes->setMethods($config['methods'] ?? []);
+        $routes->setCondition($config['condition'] ?? null);
+
+        if (isset($config['host'])) {
+            $this->addHost($routes, $config['host']);
+        }
     }
 
     /**
@@ -198,7 +203,7 @@ class YamlFileLoader extends FileLoader
             $this->addPrefix($subCollection, $prefix, $trailingSlashOnRoot);
 
             if (null !== $host) {
-                $subCollection->setHost($host);
+                $this->addHost($subCollection, $host);
             }
             if (null !== $condition) {
                 $subCollection->setCondition($condition);
diff --git a/src/Symfony/Component/Routing/Loader/schema/routing/routing-1.0.xsd b/src/Symfony/Component/Routing/Loader/schema/routing/routing-1.0.xsd
index 423aa7979e..846d126724 100644
--- a/src/Symfony/Component/Routing/Loader/schema/routing/routing-1.0.xsd
+++ b/src/Symfony/Component/Routing/Loader/schema/routing/routing-1.0.xsd
@@ -45,6 +45,7 @@
     <xsd:sequence>
       <xsd:group ref="configs" minOccurs="0" maxOccurs="unbounded" />
       <xsd:element name="path" type="localized-path" minOccurs="0" maxOccurs="unbounded" />
+      <xsd:element name="host" type="localized-path" minOccurs="0" maxOccurs="unbounded" />
     </xsd:sequence>
     <xsd:attribute name="id" type="xsd:string" use="required" />
     <xsd:attribute name="path" type="xsd:string" />
@@ -63,6 +64,7 @@
       <xsd:group ref="configs" minOccurs="0" maxOccurs="unbounded" />
       <xsd:element name="prefix" type="localized-path" minOccurs="0" maxOccurs="unbounded" />
       <xsd:element name="exclude" type="xsd:string" minOccurs="0" maxOccurs="unbounded" />
+      <xsd:element name="host" type="localized-path" minOccurs="0" maxOccurs="unbounded" />
     </xsd:sequence>
     <xsd:attribute name="resource" type="xsd:string" use="required" />
     <xsd:attribute name="type" type="xsd:string" />
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-host-expected-collection.php b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-host-expected-collection.php
new file mode 100644
index 0000000000..13f4a09b08
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-host-expected-collection.php
@@ -0,0 +1,50 @@
+<?php
+
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
+
+return function (string $format) {
+    $expectedRoutes = new RouteCollection();
+    $expectedRoutes->add('imported.en', $route = new Route('/example'));
+    $route->setHost('www.example.com');
+    $route->setRequirement('_locale', 'en');
+    $route->setDefault('_locale', 'en');
+    $route->setDefault('_canonical_route', 'imported');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported.nl', $route = new Route('/voorbeeld'));
+    $route->setHost('www.example.nl');
+    $route->setRequirement('_locale', 'nl');
+    $route->setDefault('_locale', 'nl');
+    $route->setDefault('_canonical_route', 'imported');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_not_localized.en', $route = new Route('/here'));
+    $route->setHost('www.example.com');
+    $route->setRequirement('_locale', 'en');
+    $route->setDefault('_locale', 'en');
+    $route->setDefault('_canonical_route', 'imported_not_localized');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_not_localized.nl', $route = new Route('/here'));
+    $route->setHost('www.example.nl');
+    $route->setRequirement('_locale', 'nl');
+    $route->setDefault('_locale', 'nl');
+    $route->setDefault('_canonical_route', 'imported_not_localized');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_single_host.en', $route = new Route('/here_again'));
+    $route->setHost('www.example.com');
+    $route->setRequirement('_locale', 'en');
+    $route->setDefault('_locale', 'en');
+    $route->setDefault('_canonical_route', 'imported_single_host');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_single_host.nl', $route = new Route('/here_again'));
+    $route->setHost('www.example.nl');
+    $route->setRequirement('_locale', 'nl');
+    $route->setDefault('_locale', 'nl');
+    $route->setDefault('_canonical_route', 'imported_single_host');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+
+    $expectedRoutes->addResource(new FileResource(__DIR__."/imported.$format"));
+    $expectedRoutes->addResource(new FileResource(__DIR__."/importer-with-host.$format"));
+
+    return $expectedRoutes;
+};
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-locale-and-host-expected-collection.php b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-locale-and-host-expected-collection.php
new file mode 100644
index 0000000000..099fbdcf47
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-locale-and-host-expected-collection.php
@@ -0,0 +1,50 @@
+<?php
+
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
+
+return function (string $format) {
+    $expectedRoutes = new RouteCollection();
+    $expectedRoutes->add('imported.en', $route = new Route('/en/example'));
+    $route->setHost('www.example.com');
+    $route->setRequirement('_locale', 'en');
+    $route->setDefault('_locale', 'en');
+    $route->setDefault('_canonical_route', 'imported');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported.nl', $route = new Route('/nl/voorbeeld'));
+    $route->setHost('www.example.nl');
+    $route->setRequirement('_locale', 'nl');
+    $route->setDefault('_locale', 'nl');
+    $route->setDefault('_canonical_route', 'imported');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_not_localized.en', $route = new Route('/en/here'));
+    $route->setHost('www.example.com');
+    $route->setRequirement('_locale', 'en');
+    $route->setDefault('_locale', 'en');
+    $route->setDefault('_canonical_route', 'imported_not_localized');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_not_localized.nl', $route = new Route('/nl/here'));
+    $route->setHost('www.example.nl');
+    $route->setRequirement('_locale', 'nl');
+    $route->setDefault('_locale', 'nl');
+    $route->setDefault('_canonical_route', 'imported_not_localized');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_single_host.en', $route = new Route('/en/here_again'));
+    $route->setHost('www.example.com');
+    $route->setRequirement('_locale', 'en');
+    $route->setDefault('_locale', 'en');
+    $route->setDefault('_canonical_route', 'imported_single_host');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_single_host.nl', $route = new Route('/nl/here_again'));
+    $route->setHost('www.example.nl');
+    $route->setRequirement('_locale', 'nl');
+    $route->setDefault('_locale', 'nl');
+    $route->setDefault('_canonical_route', 'imported_single_host');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+
+    $expectedRoutes->addResource(new FileResource(__DIR__."/imported.$format"));
+    $expectedRoutes->addResource(new FileResource(__DIR__."/importer-with-locale-and-host.$format"));
+
+    return $expectedRoutes;
+};
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-single-host-expected-collection.php b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-single-host-expected-collection.php
new file mode 100644
index 0000000000..fd66fd537c
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-with-single-host-expected-collection.php
@@ -0,0 +1,32 @@
+<?php
+
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
+
+return function (string $format) {
+    $expectedRoutes = new RouteCollection();
+    $expectedRoutes->add('imported.en', $route = new Route('/example'));
+    $route->setHost('www.example.com');
+    $route->setRequirement('_locale', 'en');
+    $route->setDefault('_locale', 'en');
+    $route->setDefault('_canonical_route', 'imported');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported.nl', $route = new Route('/voorbeeld'));
+    $route->setHost('www.example.com');
+    $route->setRequirement('_locale', 'nl');
+    $route->setDefault('_locale', 'nl');
+    $route->setDefault('_canonical_route', 'imported');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_not_localized', $route = new Route('/here'));
+    $route->setHost('www.example.com');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_single_host', $route = new Route('/here_again'));
+    $route->setHost('www.example.com');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+
+    $expectedRoutes->addResource(new FileResource(__DIR__."/imported.$format"));
+    $expectedRoutes->addResource(new FileResource(__DIR__."/importer-with-single-host.$format"));
+
+    return $expectedRoutes;
+};
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-without-host-expected-collection.php b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-without-host-expected-collection.php
new file mode 100644
index 0000000000..bd2e41353f
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/import-without-host-expected-collection.php
@@ -0,0 +1,31 @@
+<?php
+
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
+
+return function (string $format) {
+    $expectedRoutes = new RouteCollection();
+    $expectedRoutes->add('imported.en', $route = new Route('/example'));
+    $route->setHost('www.custom.com');
+    $route->setRequirement('_locale', 'en');
+    $route->setDefault('_locale', 'en');
+    $route->setDefault('_canonical_route', 'imported');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported.nl', $route = new Route('/voorbeeld'));
+    $route->setHost('www.custom.nl');
+    $route->setRequirement('_locale', 'nl');
+    $route->setDefault('_locale', 'nl');
+    $route->setDefault('_canonical_route', 'imported');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_not_localized', $route = new Route('/here'));
+    $route->setDefault('_controller', 'ImportedController::someAction');
+    $expectedRoutes->add('imported_single_host', $route = new Route('/here_again'));
+    $route->setHost('www.custom.com');
+    $route->setDefault('_controller', 'ImportedController::someAction');
+
+    $expectedRoutes->addResource(new FileResource(__DIR__."/imported.$format"));
+    $expectedRoutes->addResource(new FileResource(__DIR__."/importer-without-host.$format"));
+
+    return $expectedRoutes;
+};
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.php b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.php
new file mode 100644
index 0000000000..4abe703b95
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Symfony\Component\Routing\Loader\Configurator;
+
+return function (RoutingConfigurator $routes) {
+    $routes
+        ->add('imported', ['nl' => '/voorbeeld', 'en' => '/example'])
+            ->controller('ImportedController::someAction')
+            ->host([
+                'nl' => 'www.custom.nl',
+                'en' => 'www.custom.com',
+            ])
+        ->add('imported_not_localized', '/here')
+            ->controller('ImportedController::someAction')
+        ->add('imported_single_host', '/here_again')
+            ->controller('ImportedController::someAction')
+            ->host('www.custom.com')
+    ;
+};
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.xml b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.xml
new file mode 100644
index 0000000000..30ff6811a2
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<routes xmlns="http://symfony.com/schema/routing"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://symfony.com/schema/routing
+        https://symfony.com/schema/routing/routing-1.0.xsd">
+    <route id="imported">
+        <default key="_controller">ImportedController::someAction</default>
+        <path locale="nl">/voorbeeld</path>
+        <path locale="en">/example</path>
+        <host locale="nl">www.custom.nl</host>
+        <host locale="en">www.custom.com</host>
+    </route>
+    <route id="imported_not_localized" path="/here">
+        <default key="_controller">ImportedController::someAction</default>
+    </route>
+    <route id="imported_single_host" path="/here_again" host="www.custom.com">
+        <default key="_controller">ImportedController::someAction</default>
+    </route>
+</routes>
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.yml b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.yml
new file mode 100644
index 0000000000..22feea82e5
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/imported.yml
@@ -0,0 +1,18 @@
+---
+imported:
+    controller: ImportedController::someAction
+    path:
+        nl: /voorbeeld
+        en: /example
+    host:
+        nl: www.custom.nl
+        en: www.custom.com
+
+imported_not_localized:
+    controller: ImportedController::someAction
+    path: /here
+
+imported_single_host:
+    controller: ImportedController::someAction
+    path: /here_again
+    host: www.custom.com
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.php b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.php
new file mode 100644
index 0000000000..14c3e96312
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Symfony\Component\Routing\Loader\Configurator;
+
+return function (RoutingConfigurator $routes) {
+    $routes->import('imported.php')->host([
+        'nl' => 'www.example.nl',
+        'en' => 'www.example.com',
+    ]);
+};
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.xml b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.xml
new file mode 100644
index 0000000000..e06136d8af
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<routes xmlns="http://symfony.com/schema/routing"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://symfony.com/schema/routing
+        https://symfony.com/schema/routing/routing-1.0.xsd">
+    <import resource="./imported.xml">
+        <host locale="nl">www.example.nl</host>
+        <host locale="en">www.example.com</host>
+    </import>
+</routes>
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.yml b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.yml
new file mode 100644
index 0000000000..f93ece8b7f
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-host.yml
@@ -0,0 +1,6 @@
+---
+i_need:
+    resource: ./imported.yml
+    host:
+        nl: www.example.nl
+        en: www.example.com
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.php b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.php
new file mode 100644
index 0000000000..ae86b05f8a
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace Symfony\Component\Routing\Loader\Configurator;
+
+return function (RoutingConfigurator $routes) {
+    $routes->import('imported.php')->host([
+        'nl' => 'www.example.nl',
+        'en' => 'www.example.com',
+    ])->prefix([
+        'nl' => '/nl',
+        'en' => '/en',
+    ]);
+};
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.xml b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.xml
new file mode 100644
index 0000000000..71904bd2a6
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<routes xmlns="http://symfony.com/schema/routing"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://symfony.com/schema/routing
+        https://symfony.com/schema/routing/routing-1.0.xsd">
+    <import resource="./imported.xml">
+        <prefix locale="nl">/nl</prefix>
+        <prefix locale="en">/en</prefix>
+        <host locale="nl">www.example.nl</host>
+        <host locale="en">www.example.com</host>
+    </import>
+</routes>
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.yml b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.yml
new file mode 100644
index 0000000000..bc10ec4c50
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-locale-and-host.yml
@@ -0,0 +1,9 @@
+---
+i_need:
+    resource: ./imported.yml
+    prefix:
+        nl: /nl
+        en: /en
+    host:
+        nl: www.example.nl
+        en: www.example.com
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.php b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.php
new file mode 100644
index 0000000000..834f2cbb26
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\Routing\Loader\Configurator;
+
+return function (RoutingConfigurator $routes) {
+    $routes->import('imported.php')->host('www.example.com');
+};
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.xml b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.xml
new file mode 100644
index 0000000000..121a78b2bf
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<routes xmlns="http://symfony.com/schema/routing"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://symfony.com/schema/routing
+        https://symfony.com/schema/routing/routing-1.0.xsd">
+    <import resource="./imported.xml" host="www.example.com">
+    </import>
+</routes>
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.yml b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.yml
new file mode 100644
index 0000000000..5e4d45c29a
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-with-single-host.yml
@@ -0,0 +1,4 @@
+---
+i_need:
+    resource: ./imported.yml
+    host: www.example.com
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.php b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.php
new file mode 100644
index 0000000000..ab5565c7a9
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\Routing\Loader\Configurator;
+
+return function (RoutingConfigurator $routes) {
+    $routes->import('imported.php');
+};
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.xml b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.xml
new file mode 100644
index 0000000000..a8fb3d8e66
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<routes xmlns="http://symfony.com/schema/routing"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://symfony.com/schema/routing
+        https://symfony.com/schema/routing/routing-1.0.xsd">
+    <import resource="./imported.xml">
+    </import>
+</routes>
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.yml b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.yml
new file mode 100644
index 0000000000..ef7ecebb82
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/locale_and_host/importer-without-host.yml
@@ -0,0 +1,3 @@
+---
+i_need:
+    resource: ./imported.yml
diff --git a/src/Symfony/Component/Routing/Tests/Loader/PhpFileLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/PhpFileLoaderTest.php
index ffde004ade..0c46ea2b9c 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/PhpFileLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/PhpFileLoaderTest.php
@@ -243,4 +243,44 @@ class PhpFileLoaderTest extends TestCase
 
         $this->assertEquals($expectedCollection, $routeCollection);
     }
+
+    public function testImportingRoutesWithHostsInImporter()
+    {
+        $loader = new PhpFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-with-host.php');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-with-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('php'), $routes);
+    }
+
+    public function testImportingRoutesWithLocalesAndHostInImporter()
+    {
+        $loader = new PhpFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-with-locale-and-host.php');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-with-locale-and-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('php'), $routes);
+    }
+
+    public function testImportingRoutesWithoutHostInImporter()
+    {
+        $loader = new PhpFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-without-host.php');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-without-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('php'), $routes);
+    }
+
+    public function testImportingRoutesWithSingleHostInImporter()
+    {
+        $loader = new PhpFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-with-single-host.php');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-with-single-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('php'), $routes);
+    }
 }
diff --git a/src/Symfony/Component/Routing/Tests/Loader/XmlFileLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/XmlFileLoaderTest.php
index b448c68bbc..65ecc2d9b4 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/XmlFileLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/XmlFileLoaderTest.php
@@ -520,4 +520,44 @@ class XmlFileLoaderTest extends TestCase
         $this->assertEquals('/slash/', $routeCollection->get('a_app_homepage')->getPath());
         $this->assertEquals('/no-slash', $routeCollection->get('b_app_homepage')->getPath());
     }
+
+    public function testImportingRoutesWithHostsInImporter()
+    {
+        $loader = new XmlFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-with-host.xml');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-with-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('xml'), $routes);
+    }
+
+    public function testImportingRoutesWithLocalesAndHostInImporter()
+    {
+        $loader = new XmlFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-with-locale-and-host.xml');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-with-locale-and-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('xml'), $routes);
+    }
+
+    public function testImportingRoutesWithoutHostsInImporter()
+    {
+        $loader = new XmlFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-without-host.xml');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-without-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('xml'), $routes);
+    }
+
+    public function testImportingRoutesWithSingleHostsInImporter()
+    {
+        $loader = new XmlFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-with-single-host.xml');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-with-single-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('xml'), $routes);
+    }
 }
diff --git a/src/Symfony/Component/Routing/Tests/Loader/YamlFileLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/YamlFileLoaderTest.php
index 24bb4eeb4e..39a1541663 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/YamlFileLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/YamlFileLoaderTest.php
@@ -392,4 +392,44 @@ class YamlFileLoaderTest extends TestCase
         $loader = new YamlFileLoader(new FileLocator([__DIR__.'/../Fixtures']));
         $loader->load('requirements_without_placeholder_name.yml');
     }
+
+    public function testImportingRoutesWithHostsInImporter()
+    {
+        $loader = new YamlFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-with-host.yml');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-with-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('yml'), $routes);
+    }
+
+    public function testImportingRoutesWithLocalesAndHostInImporter()
+    {
+        $loader = new YamlFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-with-locale-and-host.yml');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-with-locale-and-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('yml'), $routes);
+    }
+
+    public function testImportingRoutesWithoutHostInImporter()
+    {
+        $loader = new YamlFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-without-host.yml');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-without-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('yml'), $routes);
+    }
+
+    public function testImportingRoutesWithSingleHostInImporter()
+    {
+        $loader = new YamlFileLoader(new FileLocator([__DIR__.'/../Fixtures/locale_and_host']));
+        $routes = $loader->load('importer-with-single-host.yml');
+
+        $expectedRoutes = require __DIR__.'/../Fixtures/locale_and_host/import-with-single-host-expected-collection.php';
+
+        $this->assertEquals($expectedRoutes('yml'), $routes);
+    }
 }