Access Control Allow Origin issue in Angular 2

Question

I have a problem with getting data from my node.js server.

The client side is:

    public getTestLines() : Observable {
    let hea         


        

Answer 1

Don't set Access-Control-Allow-Origin on the request, it is never needed there. You should double-check if the header is present on the response (check it in the developer console). It would be helpful if you shared more of the backend code.