RequestOptions deprecated symbol error in Angular 5 - angular5

Question

I'm trying to adapt code in Angular 4 to Angular 5.
I made many changes but I had an error about RequestOptions.
The code is about authentication and this is where I have the error:
import { Injectable } from '#angular/core';
import { RequestOptions } from '#angular/http';
import { User } from '../model/model.user';
import 'rxjs/add/operator/map';
import { HttpClient, HttpHeaders } from '#angular/common/http';
#Injectable()
export class AuthService {
constructor(public http: HttpClient) { }
public logIn(user: User) {
const headers = new HttpHeaders();
headers.append('Accept', 'application/json')
// creating base64 encoded String from user name and password
const base64Credential: string = btoa(user.username + ':' + user.password);
headers.append('Authorization', 'Basic ' + base64Credential);
// this is where i'm having a problem :
const httpOptions = new RequestOptions();
httpOptions.headers = headers;
return this.http.get('http://localhost:8081/' + '/account/login',
httpOptions)
.map(resp => {
// login successful if there's a jwt token in the response
const user = resp.json().principal; // the returned user object is a principal object
if (user) {
// store user details in local storage to keep user logged in between page refreshes
localStorage.setItem('currentUser', JSON.stringify(user));
}
});
}
logOut() {
// remove user from local storage to log user out
return this.http.post('http://localhost:8081/' + 'logout', {})
.map(resp => {
localStorage.removeItem('currentUser');
});
}
}
error : deprecated symbol used
please help me changing the code in Angular 5 (RequestOptions)

Answer 1

You shouldn't use RequestOptions from the deprecated module #angular/http.
As indicated in the API documentation the options are now of the following type:
{
headers?: HttpHeaders | {
[header: string]: string | string[];
};
observe?: HttpObserve;
params?: HttpParams | {
[param: string]: string | string[];
};
reportProgress?: boolean;
responseType?: 'arraybuffer' | 'blob' | 'json' | 'text';
withCredentials?: boolean;
}
Thus you should write:
const headers = new HttpHeaders();
headers.append('Accept', 'application/json')
const base64Credential: string = btoa( user.username + ':' + user.password);
headers.append('Authorization', 'Basic ' + base64Credential);
this.http.get('http://localhost:8081/' + '/account/login', {
headers: headers
});
Or alternatively:
this.http.get('http://localhost:8081/' + '/account/login', {
headers: {
'Accept': 'application/json',
'Authorization': 'Basic ' + btoa(user.username + ':' + user.password)
}
});