auth

import {
   Component,
   OnInit
} from '@angular/core';
import {
   Router,
   RouterModule,
   Routes
} from '@angular/router';
import {
   HttpClient,
   HttpHeaders
} from '@angular/common/http';
export class SystemComponent implements OnInit {
   constructor( private http: HttpClient, private router: Router) {}

ngOnInit() {
   const self = this;
   const sendData = {};
   sendData['id'] = sessionStorage.getItem('id');
   console.log(JSON.stringify(sendData));
   const headers = new HttpHeaders()
      .set('Content-Type', 'application/json')
      .set('token', sessionStorage.getItem('auth') ? sessionStorage.getItem('auth') : 'thismyPc');
   this.http.post('http://thismypc.com:5000/auth',
         JSON.stringify(sendData), {
            headers
         })
      .subscribe(
         (val: any) => {},
         response => {
            // if offline
            this.router.navigate(['/login']);
         },
         () => {
            console.log('The POST observable is now completed.');
         });
}