how to set headers to application/json in angular2

Question

I am trying to send HTTP post request in Angular2 but not able to set headers to content type application JSON.

My code is:

login(url,postdata)
{
            


        

Answer 1

change _http.post parameters :

login(url,postdata) {
    var headers = new Headers({'Content-Type': 'application/json'});
    return this._http.post(url,postdata,{headers:headers})
                .map(res => res.json())    
}