Addind headers to HTTP Native

Hello guys, I need to perform a GET operation with HTTP Native with the following headders. This is how I set the headers for the HttpClient from Angular:

const headers = {
      headers: new HttpHeaders({
        'Content-Type':  'application/json',
        'Authorization': 'Basic ZTlSR3BseG53b0pKOG8yc1pEWmFmQUdlQjJUR3VJdVI6TEthYTVabXdDcVV5SnU5VA=='
      })
    };

How can I do this with HTTP Native? I can’t seem to be doing it properly and it doesn’t work if I just put the content in the curly brackets. This is what I am doing:

this.http2.get(ENTORNO.OBTENER_CITAS + nhc, {params: params }, {
      'Content-Type':  'application/json',
      'Authorization': 'Basic ZTlSR3BseG53b0pKOG8yc1pEWmFmQUdlQjJUR3VJdVI6TEthYTVabXdDcVV5SnU5VA=='
    })
  .then(data => {

    console.log("ok");
    console.log(data.status);
    console.log(data.data); // data received by server
    console.log(data.headers);

  })
  .catch(error => {

    
    console.log("error");
    console.log(error.status);
    console.log(error.error); // error message as string
    console.log(error.headers);

  });

Thanks.