get header parameter from http response in ionic 5.4.16

Question

I have a login service in odoo, which gives token in header response of login request. The subsequent requests require that token in headers only after that it will be authorized.

How can i access that token so that after saving it can be sent in next requests ?

Below is my tried code which doesn't work.

var headers = new HttpHeaders();
headers.append('Accept', 'application/json');
headers.append('Content-Type', 'application/json' );
headers.append('');

this.testResp = this.httpClient.post(this.serverURL,this.postParam,{ headers: headers })
  .subscribe(data => {
    console.log(data['_body']);
   }, error => {
    console.log(error);
  });

Below is the postman request which gives me token in response header session-id in Set-Cookie.

Followed solution mentioned in this link but still it does not giving the expected result.

Here is updated code

var headers = new HttpHeaders();
    headers.append('Accept', 'application/json');
    headers.append('Content-Type', 'application/json' );
const options = {
      headers: headers,
      observe: "response" as 'body', // to display the full response & as 'body' for type cast
      responseType: "json"
    };

    this.testResp = this.httpClient.post(this.serverURL, this.postParam,  {headers: headers, observe: "response"})
    .subscribe(response => {
        console.log(response.headers.has("Set-Cookie"));
        return response;
    }, err => {
        throw err;
    });