Get a token ID so our BE knows you're legit

af.ts

...

getTokenAndSendToAPI() {
    this.afAuth.auth.currentUser.getToken().then(idToken => {
      this.tokenID = idToken;
      console.log('getTokenAndSendToAPI() idToken', this.tokenID);
      let headersObj = new Headers();
      headersObj.append('Authorization', 'Bearer ' + this.tokenID)
      let options = new RequestOptions({ headers: headersObj });

      this.http.get(this.authApiUrl, options)
        .toPromise()
        .then(function (res) {
          console.log('getTokenAndSendToAPI() signin success?', res.json());
        })
        .catch(function(error) {
          console.log('getTokenAndSendToAPI() sigin error', error);
        });
    }).catch(function(error) {
      console.log('currentUser getToken error', error)
    });
  }
...