How to get response from post request angular.

I am trying to get full response from a POST request. I have read how to get full response for a get request mentioned at the official site of angular. Angular http

What it says is to add { observe: 'response' }. But it would work for a get request and not for post request. post request accepts 2-3 arguments, so I cannot send this as the 4th argument. Please have a look at my code and let me know what I am doing wrong.

Explanation:

const httpOptions: { headers; observe; } = {

 headers: new HttpHeaders({

   'Content-Type':  'application/json'

 }),

 observe: 'response'

};

return this.http.post('http://localhost:3000/api/Users/login', data, httpOptions) ..