AngularJS send POST Request to server-side script

I'm building a webapp with yeoman tools using AngularJS, and am having trouble sending a POST request to a server side script from a controller. Here is the function in my controller code:

$scope.addUser = function() {
  $http.post('addUser.php', $scope.user).success(function(response) {
    console.log('success');
    console.log(response);
    $scope.showForm = false;
    $scope.infoSubmitted = true;
  }).error(function(err){
    console.log('failure');
    console.log(err);
  });

};

The addUser.php file is located in the app/ directory, along with index.html. I am a little confused as to how AngularJS handles routing, as well. I know that I can define routes for GET requests in the app.js file with .when({ ... }), but I can't see how to handle POST requests and call server side scripts.

This is the .php file I want to connect to:

<?php

$errors     = array();    // array to hold validation errors
$data       = array();    // array to pass back data

// validate the variables ======================================================
if (empty($_POST['name']))
$errors['name'] = 'Name is required.';

if (empty($_POST['email']))
$errors['email'] = 'Email is required.';

// return a response ===========================================================

// response if there are errors
if ( ! empty($errors)) {

// if there are items in our errors array, return those errors
  $data['success'] = false;
  $data['errors']  = $errors;
} else {

// if there are no errors, return a message
  $data['success'] = true;
  $data['message'] = 'Success!';
}

// return all our data to an AJAX call
echo json_encode($data);