Fix the header issue of different server

git-svn-id: https://plugins.svn.wordpress.org/aftership-woocommerce-tracking/trunk@972873 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix header issues

git-svn-id: https://plugins.svn.wordpress.org/aftership-woocommerce-tracking/trunk@972875 b8457f37-d9ea-0310-8a92-e5e31aec5664