MAGETWO-98345: [2.1.0] underscore in site url breaks admin redirect - The page isn't redirecting properly #5809

Author: rganin

app/code/Magento/Config/Model/Config/Backend/Baseurl.php

@@ -201,7 +201,6 @@ private function _validateFullyQualifiedUrl($value)
      */
     private function _isFullyQualifiedUrl($value)
     {
-        $url = parse_url($value);
         return preg_match('/\/$/', $value) && $this->getUrlValidator()->isValid($value, ['http', 'https']);
     }
 

dev/tests/integration/testsuite/Magento/Setup/Controller/UrlCheckTest.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright © 2016 Magento. All rights reserved.
+ * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
 namespace Magento\Setup\Controller;
@@ -21,12 +21,11 @@ protected function setUp()
         $this->controller = Bootstrap::getObjectManager()->create(UrlCheck::class);
  	}
 
- 	/**
-     * @param array $requestContent
-     * @param bool $successUrl
-     * @param bool $successSecureUrl
-     * @return void
-     * @dataProvider indexActionDataProvider
+    /**
+     * @param $requestContent
+     * @param $successUrl
+     * @param $successSecureUrl
+     * @throws \ReflectionException
      */
     public function testIndexAction($requestContent, $successUrl, $successSecureUrl)
     {