Ionic native POST sending no data

Ok, got it., thank you! After switching over to angular http it still isn't working though... The server is getting the request but no header or data... Thank you again!

import {Injectable} from "@angular/core";
import {Http, Headers, Response} from "@angular/http";
import {User} from "./user";
import {Config} from "../config";
import {Observable} from "rxjs/Rx";
import 'rxjs/add/operator/map';

@Injectable()
export class UserService {

  constructor(private _http: Http) {}


  //Makes http request to valid username and password
  login(user: User) {
    //Creates header to tell server that it is getting json
    let headers = new Headers();
    headers.append('Content-Type', 'application/json');
    let options = { headers: headers };
    //Sets address to request
    var address = Config.apiUrl + "login/";

    //Creates JSON object that contains the data
    let data = JSON.stringify({
      username: user.username,
      password: user.password
    });

    //Make request to server
    return this._http.post(address, data, options)
    .map(res => {
      return(res);
    })
    .catch(error => {
      return Observable.throw(error);
    })
  }

I'd also like to mention that I am calling this method like this:

    this._userService.login(this.user)
    .subscribe((res: any) => {
   //Do stuff if status code is 2XX
   },
   res => {
  //Do stuff if status code is 5XX
   }