This is a way to create a guaranteed redirect on the front-end by using a combination of both a JavaScript redirect and a Meta redirect if JavaScript is turned off.
In a script tag put:
window.location.href = 'http://www.google.com'
And in no script tags add:
This second is the same thing but it uses a timer to wait a certain amount before redirecting.
var t = window.setTimeout(function(){
window.location.href = 'http://www.google.com'
}, 900000);