You’re not supposed to do this directly with the browser of the client.
One can make the POST request using AJAX in an async way, though again, this uses the client and might be vurnerable.
But the best way to do it, is using PHP on your page, that makes the request before sending the the user somewhere. this would happen in your “redirect.cfm”. If it failed to do this post in PHP, it could actually redirect the user to an error page.