#112064 by Dave Cohen and pwolanin: do not cache installer redirects, so live...

#112064 by Dave Cohen and pwolanin: do not cache installer redirects, so live Drupal pages will be visible instead of cached installer pages

includes/install.inc

@@ -590,6 +590,7 @@ function drupal_install_fix_file($file, $mask, $message = TRUE) {
 function install_goto($path) {
   global $base_url;
   header('Location: '. $base_url .'/'. $path);
+  header('Cache-Control: no-cache'); // Not a permanent redirect.
   exit();
 }