diff -r 07239de796bb -r e756a8c72c3d cms/drupal/modules/aggregator/aggregator.fetcher.inc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cms/drupal/modules/aggregator/aggregator.fetcher.inc	Fri Sep 08 12:04:06 2017 +0200
@@ -0,0 +1,61 @@
+<?php
+
+/**
+ * @file
+ * Fetcher functions for the aggregator module.
+ */
+
+/**
+ * Implements hook_aggregator_fetch_info().
+ */
+function aggregator_aggregator_fetch_info() {
+  return array(
+    'title' => t('Default fetcher'),
+    'description' => t('Downloads data from a URL using Drupal\'s HTTP request handler.'),
+  );
+}
+
+/**
+ * Implements hook_aggregator_fetch().
+ */
+function aggregator_aggregator_fetch($feed) {
+  $feed->source_string = FALSE;
+
+  // Generate conditional GET headers.
+  $headers = array();
+  if ($feed->etag) {
+    $headers['If-None-Match'] = $feed->etag;
+  }
+  if ($feed->modified) {
+    $headers['If-Modified-Since'] = gmdate(DATE_RFC7231, $feed->modified);
+  }
+
+  // Request feed.
+  $result = drupal_http_request($feed->url, array('headers' => $headers));
+
+  // Process HTTP response code.
+  switch ($result->code) {
+    case 304:
+      break;
+    case 301:
+      $feed->url = $result->redirect_url;
+      // Do not break here.
+    case 200:
+    case 302:
+    case 307:
+      if (!isset($result->data)) {
+        $result->data = '';
+      }
+      if (!isset($result->headers)) {
+        $result->headers = array();
+      }
+      $feed->source_string = $result->data;
+      $feed->http_headers = $result->headers;
+      break;
+    default:
+      watchdog('aggregator', 'The feed from %site seems to be broken, due to "%error".', array('%site' => $feed->title, '%error' => $result->code . ' ' . $result->error), WATCHDOG_WARNING);
+      drupal_set_message(t('The feed from %site seems to be broken, because of error "%error".', array('%site' => $feed->title, '%error' => $result->code . ' ' . $result->error)));
+  }
+
+  return $feed->source_string === FALSE ? FALSE : TRUE;
+}