How to set headers to application/json in Angular 2

I'm trying to send HTTP post request in Angular 2 but not able to set headers to content type application JSON.

My code is:

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


When I checked in network I found that Content-Type is set as text/plain and thus server is not receiving any data. Any suggestions will be appreciated.

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