Reverted back the implemented interface and changed the client method

Author: suneet64

app/code/Magento/Review/Block/Adminhtml/Add.php

@@ -56,7 +56,7 @@ protected function _construct()
                     },
                     loadProductData : function() {
                         jQuery.ajax({
-                            type: "POST",
+                            type: "GET",
                             url: review.productInfoUrl,
                             data: {
                                 form_key: FORM_KEY

app/code/Magento/Review/Controller/Adminhtml/Product/JsonProductInfo.php

@@ -5,7 +5,7 @@
  */
 namespace Magento\Review\Controller\Adminhtml\Product;
 
-use Magento\Framework\App\Action\HttpPostActionInterface;
+use Magento\Framework\App\Action\HttpGetActionInterface;
 use Magento\Review\Controller\Adminhtml\Product as ProductController;
 use Magento\Backend\App\Action\Context;
 use Magento\Framework\Registry;
@@ -18,7 +18,7 @@
 /**
  * Represents product info in json
  */
-class JsonProductInfo extends ProductController implements HttpPostActionInterface
+class JsonProductInfo extends ProductController implements HttpGetActionInterface
 {
     /**
      * @var \Magento\Catalog\Api\ProductRepositoryInterface