Hi Andy,
This is a bit depending on your server. The most supported way al around seems indeed append a query string.
You can use this one to set it to one day, or an hour, or even 10 minutes, by amending the length.
`${url}?v=${new Date().toISOString().slice(0,13)}`
(sample is using the ES6 template strings. you can use that natively in all browsers that have official angular support)
Regards
Sander
@Component({ selector: 'login', templateUrl: '/app/login/login.html'})