diff --git a/core/lib/Drupal/Core/Path/AliasStorage.php b/core/lib/Drupal/Core/Path/AliasStorage.php
index 899c39e..9732cc8 100644
--- a/core/lib/Drupal/Core/Path/AliasStorage.php
+++ b/core/lib/Drupal/Core/Path/AliasStorage.php
@@ -8,6 +8,7 @@
 namespace Drupal\Core\Path;
 
 use Drupal\Core\Cache\Cache;
+use Drupal\Component\Utility\Unicode;
 use Drupal\Core\Database\Connection;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Language\LanguageInterface;
@@ -59,7 +60,7 @@ public function save($source, $alias, $langcode = LanguageInterface::LANGCODE_NO
 
     $fields = array(
       'source' => $source,
-      'alias' => $alias,
+      'alias' => Unicode::strtolower($alias),
       'langcode' => $langcode,
     );
 
diff --git a/core/lib/Drupal/Core/PathProcessor/PathProcessorAlias.php b/core/lib/Drupal/Core/PathProcessor/PathProcessorAlias.php
index d7bd416..ebad3ab 100644
--- a/core/lib/Drupal/Core/PathProcessor/PathProcessorAlias.php
+++ b/core/lib/Drupal/Core/PathProcessor/PathProcessorAlias.php
@@ -7,6 +7,8 @@
 
 namespace Drupal\Core\PathProcessor;
 
+use Drupal\Component\Utility\Unicode;
+use Drupal\Core\Cache\CacheableMetadata;
 use Drupal\Core\Path\AliasManagerInterface;
 use Drupal\Core\Render\BubbleableMetadata;
 use Symfony\Component\HttpFoundation\Request;
diff --git a/core/lib/Drupal/Core/Routing/RouteCompiler.php b/core/lib/Drupal/Core/Routing/RouteCompiler.php
index 639feff..3213bff 100644
--- a/core/lib/Drupal/Core/Routing/RouteCompiler.php
+++ b/core/lib/Drupal/Core/Routing/RouteCompiler.php
@@ -53,7 +53,7 @@ public static function compile(Route $route) {
       $num_parts,
       // These are the Symfony compiled parts.
       $symfony_compiled->getStaticPrefix(),
-      $symfony_compiled->getRegex(),
+      $symfony_compiled->getRegex() . 'i',
       $symfony_compiled->getTokens(),
       $symfony_compiled->getPathVariables(),
       $symfony_compiled->getHostRegex(),
diff --git a/core/lib/Drupal/Core/Routing/RouteProvider.php b/core/lib/Drupal/Core/Routing/RouteProvider.php
index 58b8320..3081f3b 100644
--- a/core/lib/Drupal/Core/Routing/RouteProvider.php
+++ b/core/lib/Drupal/Core/Routing/RouteProvider.php
@@ -10,6 +10,7 @@
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Cache\CacheBackendInterface;
 use Drupal\Core\Cache\CacheTagsInvalidatorInterface;
+use Drupal\Component\Utility\Unicode;
 use Drupal\Core\Path\CurrentPathStack;
 use Drupal\Core\PathProcessor\InboundPathProcessorInterface;
 use Drupal\Core\State\StateInterface;
@@ -327,7 +328,7 @@ public function getRoutesByPattern($pattern) {
   protected function getRoutesByPath($path) {
     // Split the path up on the slashes, ignoring multiple slashes in a row
     // or leading or trailing slashes.
-    $parts = preg_split('@/+@', $path, NULL, PREG_SPLIT_NO_EMPTY);
+    $parts = preg_split('@/+@', Unicode::strtolower($path), NULL, PREG_SPLIT_NO_EMPTY);
 
     $collection = new RouteCollection();
 
diff --git a/core/lib/Drupal/Core/Routing/UrlMatcher.php b/core/lib/Drupal/Core/Routing/UrlMatcher.php
index 49bff8f..8307aa6 100644
--- a/core/lib/Drupal/Core/Routing/UrlMatcher.php
+++ b/core/lib/Drupal/Core/Routing/UrlMatcher.php
@@ -9,6 +9,7 @@
 
 use Drupal\Core\Path\CurrentPathStack;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Routing\Matcher\UrlMatcher;
 use Symfony\Component\Routing\RouteCollection;
 use Symfony\Cmf\Component\Routing\NestedMatcher\UrlMatcher as BaseUrlMatcher;
 
@@ -46,4 +47,46 @@ public function finalMatch(RouteCollection $collection, Request $request) {
     return $this->match($this->currentPath->getPath($request));
   }
 
+  protected function matchCollection($pathinfo, RouteCollection $routes)
+  {
+    foreach ($routes as $name => $route) {
+      $compiledRoute = $route->compile();
+
+      if (!preg_match($compiledRoute->getRegex(), $pathinfo, $matches)) {
+        continue;
+      }
+
+      $hostMatches = array();
+      if ($compiledRoute->getHostRegex() && !preg_match($compiledRoute->getHostRegex(), $this->context->getHost(), $hostMatches)) {
+        continue;
+      }
+
+      // check HTTP method requirement
+      if ($requiredMethods = $route->getMethods()) {
+        // HEAD and GET are equivalent as per RFC
+        if ('HEAD' === $method = $this->context->getMethod()) {
+          $method = 'GET';
+        }
+
+        if (!in_array($method, $requiredMethods)) {
+          $this->allow = array_merge($this->allow, $requiredMethods);
+
+          continue;
+        }
+      }
+
+      $status = $this->handleRouteRequirements($pathinfo, $name, $route);
+
+      if (self::ROUTE_MATCH === $status[0]) {
+        return $status[1];
+      }
+
+      if (self::REQUIREMENT_MISMATCH === $status[0]) {
+        continue;
+      }
+
+      return $this->getAttributes($route, $name, array_replace($matches, $hostMatches));
+    }
+  }
+
 }