Merge remote-tracking branch 'origin/MAGETWO-49404' into W1

Author: Maksym Aposov

app/code/Magento/Search/view/frontend/templates/form.mini.phtml

@@ -23,7 +23,7 @@ $helper = $this->helper('Magento\Search\Helper\Data');
                     <input id="search"
                            data-mage-init='{"quickSearch":{
                                 "formSelector":"#search_mini_form",
-                                "url":"<?php /* @escapeNotVerified */ echo $block->getUrl('search/ajax/suggest'); ?>",
+                                "url":"<?php /* @escapeNotVerified */ echo $block->getUrl('search/ajax/suggest', ['_secure' => $block->getRequest()->isSecure()]); ?>",
                                 "destinationSelector":"#search_autocomplete"}
                            }'
                            type="text"