MAGETWO-72048: Wrong file upload behavior

Author: roman

app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/File/Upload.php

@@ -5,15 +5,15 @@
  */
 namespace Magento\Downloadable\Controller\Adminhtml\Downloadable\File;
 
-use Magento\Framework\App\Action\HttpGetActionInterface;
+use Magento\Framework\App\Action\HttpPostActionInterface;
 use Magento\Framework\Controller\ResultFactory;
 
 /**
  * Class Upload
  *
  * @package Magento\Downloadable\Controller\Adminhtml\Downloadable\File
  */
-class Upload extends \Magento\Downloadable\Controller\Adminhtml\Downloadable\File implements HttpGetActionInterface
+class Upload extends \Magento\Downloadable\Controller\Adminhtml\Downloadable\File implements HttpPostActionInterface
 {
     /**
      * @var \Magento\Downloadable\Model\Link

dev/tests/integration/testsuite/Magento/Downloadable/Controller/Adminhtml/Downloadable/FileTest.php

@@ -37,6 +37,7 @@ public function testUploadAction()
             ],
         ];
 
+        $this->getRequest()->setMethod('POST');
         $this->dispatch('backend/admin/downloadable_file/upload/type/samples');
         $body = $this->getResponse()->getBody();
         $result = Bootstrap::getObjectManager()->get(Json::class)->unserialize($body);
@@ -64,6 +65,7 @@ public function testUploadProhibitedExtensions($fileName)
             ],
         ];
 
+        $this->getRequest()->setMethod('POST');
         $this->dispatch('backend/admin/downloadable_file/upload/type/samples');
         $body = $this->getResponse()->getBody();
         $result = Bootstrap::getObjectManager()->get(Json::class)->unserialize($body);