Hey guys, Im a junior developer who's relatively new to firebase and by new I mean 2-3 days, so I'm saying this so you explain anything you wanna say like I am an idiot. I have an angular application that needs to retrieve data from a database. So for that im using firebase realtime database as my API. Upon a GET request, I get an error, looked it up on Google turns out i need to add something like "Access-control : * " or so to the response that is sent from the API. Unfortunately I dont know how to add new content to the header. Anyone who can help, I would appreciate that.

And hopefully I am clear enough with my explanation.