How to do Logout in Pingfed using Angular

Question

I am integration with Pingfed in my Angular Project, I would able to do login and can do token renewal process as well.

But I would not able to access ping_end_session_endpoint (idp/startSLO.ping), I tried with GET and POST methods getting CORS issue. If open this end point in the browser it display message as "Sign Off Successful", but still I can able access token_endpoint, userinfo_endpoints.

Is any parameter required?

return this.http.get<any>(`https://sso-xxx.com/idp/startSLO.ping`)
    .pipe(
        map(response => {
            return response;
        }),
        catchError(this.handleError)
    );