REQUESTDIGEST in Sharepoint online SPA

Question

Hello guys,

I've created a Sharepoint Online SPA using AngularJS and Breeze (with HotTowel.Angular module),and in order to perform a POST operation i need to set the 'X-RequestDigest' header with the request but unfortunately i can't use $('#__REQUESTDIGEST').val(); because it's not available to a provider hosted app.

Do you have any idea please?

Thanks in advance