POST: http://XX.XX.XX.XX:8081/login

body {
username
password
}

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';

@Injectable()
export class AuthService {
  readonly endpoint = 'http://XX.XX.XX.XX:8081/login';

  constructor(private readonly httpClient: HttpClient) { }

  post(userName: string, password: string) {
    console.log('AuthService.post has been executed!');

    const body = new HttpParams()
      .set('username', 'name')
      .set('password', 'pass');

    const headers = new HttpHeaders()
      .append('Content-Type', 'application/x-www-form-urlencoded');

    const options = {
      headers: headers
    };

    return this.httpClient.post(this.endpoint, body, options);
  }
}