Angular 2 prevent x-xsrf-token to be added on single http request

Question

I have a web app where I need to make a request to a webservice outside of my page.

This request is made from within a restricted page, and because of this, I have a x-xsrf-token set, to autenticate my user on my webpage. This is working.

But I also need to make a request to a webservice outside of my page, but it does not accept x-xsrf-token, given me this error:

XMLHttpRequest cannot load "https://webservice-here..." Request header field X-XSRF-TOKEN is not allowed by Access-Control-Allow-Headers in preflight response.

But since I'm inside a restricted area, I don't know how to solve this issue... This is my http service:

apiCustom(url: string) {
    let headers = new Headers();
    headers.delete('x-xsrf-token');

    return this._http.get(url, {
        headers: headers
    }).map(response => response.json()).do(data => {
        return data;
    }).catch(this.handleErrors);
}

I tried to delete the x-xsrf-token (also tried just xsrf-token) manually, but it didn't worked.

Is there a way to solve this?