diff --git a/composer.lock b/composer.lock
index 0b633161a1cb4908a9228a2b28cd13e740c2ae40..0f89f38ac5ac2fba73cc87fdd658677d163988f8 100644
--- a/composer.lock
+++ b/composer.lock
@@ -8,27 +8,36 @@
     "packages": [
         {
             "name": "asm89/stack-cors",
-            "version": "1.0.0",
+            "version": "1.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/asm89/stack-cors.git",
-                "reference": "3ae8ef219bb4c9a6caf857421719aa07fa7776cc"
+                "reference": "65ccbd455370f043c2e3b93482a3813603d68731"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/asm89/stack-cors/zipball/3ae8ef219bb4c9a6caf857421719aa07fa7776cc",
-                "reference": "3ae8ef219bb4c9a6caf857421719aa07fa7776cc",
+                "url": "https://api.github.com/repos/asm89/stack-cors/zipball/65ccbd455370f043c2e3b93482a3813603d68731",
+                "reference": "65ccbd455370f043c2e3b93482a3813603d68731",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.2",
-                "symfony/http-foundation": "~2.1|~3.0",
-                "symfony/http-kernel": "~2.1|~3.0"
+                "php": ">=5.5.9",
+                "symfony/http-foundation": "~2.7|~3.0",
+                "symfony/http-kernel": "~2.7|~3.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^5.0 || ^4.8.10",
+                "squizlabs/php_codesniffer": "^2.3"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
             "autoload": {
-                "psr-0": {
-                    "Asm89\\Stack": "src/"
+                "psr-4": {
+                    "Asm89\\Stack\\": "src/Asm89/Stack/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -47,7 +56,7 @@
                 "cors",
                 "stack"
             ],
-            "time": "2016-08-01T12:05:04+00:00"
+            "time": "2017-04-11T20:03:41+00:00"
         },
         {
             "name": "composer/installers",
diff --git a/core/composer.json b/core/composer.json
index 82ea0e6a4d528792be2aea79a3dacb064fc1d56f..c3600ab1a6e8285edc114baf3e804198ecf893ce 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -32,7 +32,7 @@
         "zendframework/zend-diactoros": "~1.1",
         "composer/semver": "~1.0",
         "paragonie/random_compat": "^1.0|^2.0",
-        "asm89/stack-cors": "~1.0"
+        "asm89/stack-cors": "~1.1"
     },
     "conflict": {
         "drush/drush": "<8.1.10"
diff --git a/core/tests/Drupal/FunctionalTests/HttpKernel/CorsIntegrationTest.php b/core/tests/Drupal/FunctionalTests/HttpKernel/CorsIntegrationTest.php
index c29324a013512a78d935629464e2e3484b3cedab..c8748342fb72d6d3c0372ef50bcf300304f49b9c 100644
--- a/core/tests/Drupal/FunctionalTests/HttpKernel/CorsIntegrationTest.php
+++ b/core/tests/Drupal/FunctionalTests/HttpKernel/CorsIntegrationTest.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\FunctionalTests\HttpKernel;
 
+use Drupal\Core\Url;
 use Drupal\Tests\BrowserTestBase;
 
 /**
@@ -72,6 +73,19 @@ public function testCrossSiteRequest() {
     $this->drupalGet('/test-page', [], ['Origin' => 'http://example.com']);
     $this->assertSession()->statusCodeEquals(200);
     $this->assertSession()->responseHeaderEquals('Access-Control-Allow-Origin', 'http://example.com');
+
+    // Verify POST still functions with 'Origin' header set to site's domain.
+    $origin = \Drupal::request()->getSchemeAndHttpHost();
+
+    /** @var \GuzzleHttp\ClientInterface $httpClient */
+    $httpClient = $this->getSession()->getDriver()->getClient()->getClient();
+    $url = Url::fromUri('base:/test-page');
+    $response = $httpClient->request('POST', $url->setAbsolute()->toString(), [
+      'headers' => [
+        'Origin' => $origin,
+      ]
+    ]);
+    $this->assertEquals(200, $response->getStatusCode());
   }
 
 }