Hi @joaopiopedreira. Thanks for your reply. I was able to solve this specific problems by adding the Content-Security-Policy meta tag via a head.html file instead of modifying the boilerplate-generator as suggested in the link. The boilerplate approach did not work, because the Meteor 1.2 build system overwrites these changes with a “baked-in” version of the boilerplate. But I still have this problem: