Отправка данных на сервер с помощью почтового метода в ионном

Я пытаюсь отправить данные на сервер с помощью метода post из ионной разработки, проблема в том, что я не понимаю, poque не работает.

Индекс

<ion-view view-title="Guardar estudiante">
<ion-content class="padding">
<form>
<div class="list">

<label class="item item-imput">
<input type="number" placeholder="Documento" ng-model="Usuario.idu">
</label><label class="item item-imput">
<input type="text" placeholder="Nombre" ng-model="Usuario.nom">
</label>
<label class="item item-imput">
<input type="text" placeholder="Apellidos" ng-model="Usuario.ape">
</label>

<label class="item item-imput">
<input type="text" placeholder="Direccion" ng-model="Usuario.dir">
</label>

<label class="item item-imput">
<input type="number" placeholder="Telefono" ng-model="Usuario.tel">
</label>

<label class="item item-imput">
<input type="text" placeholder="Email" ng-model="Usuario.cor">
</label>

<label class="item item-imput">
<input type="text" placeholder="Contraseña" ng-model="Usuario.pas">
</label><label class="item item-input">
<span style="text-align: center; width: 100%;">
<button
class="button icon-left" ng-click="guardarEstudiante()">
GUARDAR
</button>
</span>
</label>
</div>
</form>

<p ng-repeat='u in users'>{{u.Nombre}} </p>
<p>{{ PostDataResponse }}</p>

Controller.js

angular.module('starter.controllers', [])
.controller('GuardarEstudianteCtrl',
function($scope, $http){
$http.defaults.headers.post['Content-Type'] = 'application/x-www-form-    urlencoded;charset=utf-8';
var defaultHTTPHeaders = {
'Content-type': 'application/json',
'Accept' : 'application/json'
};
$http.defaults.headers.post = defaultHTTPHeaders;
$scope.Usuario =
{
idu : '',
nom : '',
ape : '',
dir : '',
tel : '',
cor : '',
pas : ''
};
$scope.guardarEstudiante = function(){
// alert($scope.Usuario.Apellidos)
var urlCompleta = 'http://www.******.co/*******.php?';
//var postUrl     = $sce.trustAsResourceUrl(urlCompleta);

UsuarioObj  = $scope.Usuario;

$http.post(urlCompleta, $scope.Usuario)

.then(

function(data, status, headers, config){
if (data.data.success  != 1){

alert('Error En Registro, '+ data.data.message+" Success-->     "+data.data.success+" \n user ="+ $scope.Usuario.nom+" \napellido "+$scope.Usuario.ape);
}
else
{
alert('Usuario Registrado, '+ data.data.message+" Success-->     "+data.data.success+" \n user ="+ $scope.Usuario.nom );
}

console.log('Error with the API list_mobile_project');
console.log(data);
console.log(status);
console.log(headers);
console.log(config);

$scope.users = UsuarioObj;
console.log("-------------User------------")
console.log($scope.users);

},
function(data, status, headers, config){
alert('Error De Codigo o de plataforma de salida de datos');

$scope.users = UsuarioObj;
console.log("-------------User------------")
console.log($scope.users);

}
);
};
});

PHP

<?php

if (isset($_SERVER['HTTP_ORIGIN'])) {
header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");
header('Access-Control-Allow-Credentials: true');
header('Access-Control-Max-Age: 86400');    // cache for 1 day
}

// Access-Control headers are received during OPTIONS requests
if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {

if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))
header("Access-Control-Allow-Methods: GET, POST, OPTIONS");

if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))
header("Access-Control-Allow-Headers:
{$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");

exit(0);
}/*
* Following code will update a product information
* A product is identified by product id (pid)
*/

// array for JSON response
$response = array();

// check for required fields
// check for required fields

if (isset($_POST['idu'])
&& isset($_POST['nom'])
&& isset($_POST['ape'])
&& isset($_POST['dir'])
&& isset($_POST['tel'])
&& isset($_POST['cor'])
&& isset($_POST['pas'])
)
{

$idus = $_POST['idu'];
$nomb = $_POST['nom'];
$apel=$_POST['ape'];
$dire=$_POST['dir'];
$tele=$_POST['tel'];
$corr=$_POST['cor'];
$pass=$_POST['pas'];

// include db connect class
$con = mysqli_connect("localhost","******","*******","******");

// mysql inserting a new row
$result = mysqli_query($con,"INSERT INTO ******(Id***, N****, A***, D****, T****, E*****, C****, E****) VALUES($idus,'$nomb', '$apel','$dire', $tele, '$corr','$pass','Inactivo')");// check if row inserted or not
if ($result) {
// successfully inserted into database
$response["success"] = 1;
$response["message"] = "Product successfully created.";

// echoing JSON response
echo json_encode($response);
} else {
// failed to insert row
$response["success"] = 0;
$response["message"] = "Oops! An error occurred.";

// echoing JSON response
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";

// echoing JSON response
echo json_encode($response);
}?>