Find out more about the Content Security Policy. It allows website owners to declare approved content origins that browsers should be allowed to load
The Content Security Policy is a relatively new mechanism to restrict outgoing requests and resources, that a web page refers to.
It’s a relatively new http header, that has some security benefits, if you’re in a secure domain.
There’s a lot of complexity to the Policy — find out relevant parts in the 10 minute video above, from AddressFinder Technical Lead, Nigel Ramsay.