diff --git a/core/includes/form.inc b/core/includes/form.inc
index 4edd64d..34be1d9 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -1276,7 +1276,7 @@ function drupal_redirect_form($form_state) {
   if (!isset($form_state['redirect']) || $form_state['redirect'] !== FALSE) {
     if (isset($form_state['redirect'])) {
       if (is_array($form_state['redirect'])) {
-        return new RedirectResponse($form_state['redirect'], 302);
+        return new RedirectResponse(url($form_state['redirect'][0], $form_state['redirect'][1]), $form_state['redirect'][2]);
       }
       else {
         // This function can be called from the installer, which guarantees
@@ -5203,7 +5203,7 @@ function batch_process($redirect = NULL, $url = 'batch', $redirect_callback = NU
         $function($batch['url'], $options);
       }
       else {
-        return new RedirectResponse(array($batch['url'], $options), 302);
+        return new RedirectResponse(url($batch['url'], $options), 302);
       }
     }
     else {
diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index 819e671..ce0df71 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -542,7 +542,10 @@ function install_run_task($task, &$install_state) {
       }
       // Process the batch. For progressive batches, this will redirect.
       // Otherwise, the batch will complete.
-      batch_process(install_redirect_url($install_state), install_full_redirect_url($install_state));
+      $return = batch_process(install_redirect_url($install_state), install_full_redirect_url($install_state));
+      if (is_a($return, 'Symfony\Component\HttpFoundation\RedirectResponse')) {
+        install_goto($return->getTargetUrl());
+      }
     }
     // If we are in the middle of processing this batch, keep sending back
     // any output from the batch process, until the task is complete.
diff --git a/core/includes/install.inc b/core/includes/install.inc
index e9d666f..a85c4dd 100644
--- a/core/includes/install.inc
+++ b/core/includes/install.inc
@@ -647,7 +647,17 @@ function drupal_install_fix_file($file, $mask, $message = TRUE) {
 function install_goto($path) {
   global $base_url;
   include_once DRUPAL_ROOT . '/core/includes/common.inc';
-  header('Location: ' . $base_url . '/' . $path);
+
+  // TODO this is hacking around symfony's redirection giving us a fully
+  // qualified url. It's a quick hack to get things working but warrants a
+  // security review or a better implementation.
+  if (url_is_external($path)) {
+    $real_path = $path;
+  }
+  else {
+    $real_path = $base_url . '/' . $path;
+  }
+  header('Location: ' . $real_path);
   header('Cache-Control: no-cache'); // Not a permanent redirect.
   drupal_exit();
 }