Allow cross domain access

crossdoamin.php

$method = $_SERVER['REQUEST_METHOD'];

  if (isset($_SERVER['HTTP_ORIGIN'])) {
    drupal_add_http_header('Access-Control-Allow-Origin', $_SERVER['HTTP_ORIGIN']);
  }
  if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS'])) {
    drupal_add_http_header('Access-Control-Allow-Headers', $_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']);
  }
  if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD'])) {
    drupal_add_http_header('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
  }
  if ($method == 'OPTIONS') {
    exit;
  }