$content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
post_url($dest_url."/", $envelope, array("Content-Type: ".$content_type));
$content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
post_url($dest_url."/", $envelope, array("Content-Type: ".$content_type));