I have a web page with around 10 JS files, and within the web page there should not be any form of outgoing request made by JS, that is, the scripts should be able to run locally without any HTTP request to other sites.
The thing is, I didn't write the JS code, so how do I figure out if JS is making contact with other servers? Browser's console doesn't seem to be helpful with that. Or is there a function that could override all JS outgoing requests?