Angular httpHeaders post menthod can't set parameters

Question

I am trying to get the authtoken from RestAPI using the below method. The same url,Params and Headers returns me proper response from postman. but in angular i am getting 401 unauthorized error. please help me understand where i am doing wrong? I am unable to understand why my headers are inside lazyUpdate object inside httpHeaders.

Thanks in advance.

login(loginData) {
const httpOptions = {
  headers:new HttpHeaders().set("Authorization", "Basic " + btoa("username:password")).set("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8").set("access-control-allow-credentials",'true'),
  params:new HttpParams().set('username', loginData.email).set('password', loginData.password).set('grant_type', 'grant_type')
}
this.http.post('http://xx.xx.xx.xx:xxxxx/oauth/token', httpOptions).subscribe(
  data => {
    this.saveToken(data);
    return true;
  },
  err => {
    alert('Invalid Credentials')
    return false;
  });

}

Please find the attached screenshot of the headers being sent from browser.

Answer 1

Use the HTTP header option as a third parameter in the post request.

login(loginData) { 

    let httpOptions = {
        headers: new HttpHeaders({ 
            "Access-Control-Allow-Credentials": "true",
            "Content-Type": "application/x-www-form-urlencoded;charset=UTF-8",
            'Authorization' :  "Basic " + btoa("username:password"),
            'username': loginData.email,
            'password': loginData.password,
            'grant_type': 'grant_type' 
        }) 
    };

    this.http.post('http://xx.xx.xx.xx:xxxxx/oauth/token', {},  httpOptions).subscribe( data => {
        this.saveToken(data);
        return true;
    },
    err => {
        alert('Invalid Credentials')
        return false;
    });

}