diff --git a/httprl.async.inc b/httprl.async.inc
index 423a6a7..986d967 100644
--- a/httprl.async.inc
+++ b/httprl.async.inc
@@ -17,7 +17,24 @@ function httprl_async_page() {
   if (   empty($_POST['master_key'])
       || empty($_POST['temp_key'])
       || strpos($_POST['temp_key'], 'httprl_') !== 0
-      || $_POST['master_key'] != hash('sha512', drupal_get_private_key())
+        ) {
+    httprl_fast403();
+  }
+
+  // See if a full bootstrap has been done given the Drupal version.
+  if (defined('VERSION') && substr(VERSION, 0, 1) >= 7) {
+    $level = drupal_bootstrap();
+    $full_bootstrap = ($level == DRUPAL_BOOTSTRAP_FULL) ? TRUE : FALSE;
+  }
+  else {
+    $full_bootstrap = isset($GLOBALS['multibyte']) ? TRUE : FALSE;
+  }
+  // Get the private key.
+  $private_key = $full_bootstrap ? drupal_get_private_key() : httprl_variable_get('drupal_private_key', 0);
+
+  // Exit if the master_key does not match the md5 of $private_key.
+  if (   empty($private_key)
+      || $_POST['master_key'] != hash('sha512', $private_key)
         ) {
     httprl_fast403();
   }
diff --git a/httprl.module b/httprl.module
index 29dd58d..ef95f3f 100644
--- a/httprl.module
+++ b/httprl.module
@@ -1632,3 +1632,104 @@ function _httprl_use_proxy($host) {
   $proxy_exceptions = variable_get('proxy_exceptions', array('localhost', '127.0.0.1'));
   return !in_array(strtolower($host), $proxy_exceptions, TRUE);
 }
+
+/**
+ * Returns a persistent variable.
+ *
+ * This version ignores the $conf global and reads directly from the database.
+ *
+ * Case-sensitivity of the variable_* functions depends on the database
+ * collation used. To avoid problems, always use lower case for persistent
+ * variable names.
+ *
+ * @param $name
+ *   The name of the variable to return.
+ * @param $default
+ *   The default value to use if this variable has never been set.
+ * @return
+ *   The value of the variable.
+ *
+ * @see variable_del(), variable_set()
+ */
+function httprl_variable_get($name, $default = NULL) {
+  if (defined('VERSION') && substr(VERSION, 0, 1) >= 7) {
+    $variables = array_map('unserialize', db_query('SELECT name, value FROM {variable} WHERE name = :name', array(':name' => $name))->fetchAllKeyed());
+    return isset($variables[$name]) ? $variables[$name] : $default;
+  }
+  else {
+    $result = db_query("SELECT value FROM {variable} WHERE name = '%s'", $name);
+    if (!empty($result)) {
+      $result = db_result($result);
+      if (!empty($result)) {
+        $value = unserialize($result);
+      }
+    }
+    return isset($value) ? $value : $default;
+  }
+}
+
+/**
+ *
+ *
+ * @param $array
+ *
+ */
+function httprl_run_array(&$array) {
+  $last = NULL;
+  foreach ($array as &$data) {
+    // Set the last variable if so desired.
+    if (isset($data['last'])) {
+      $last = $data['last'];
+    }
+
+    // Replace the last key with the last thing that has been returned.
+    if (array_key_exists('last', $data['args'])) {
+      $data['args']['last'] = $last;
+      $data['args'] = array_values($data['args']);
+    }
+
+    // Capture output if requested.
+    if (array_key_exists('printed', $data)) {
+      ob_start();
+    }
+
+    // Pass by reference trick for call_user_func_array().
+    $args = array();
+    foreach ($data['args'] as &$arg) {
+      $args[] = &$arg;
+    }
+
+    // Start to capture errors.
+    $track_errors = ini_set('track_errors', '1');
+    $php_errormsg = '';
+
+    // Call a function or a method.
+    switch ($data['type']) {
+      case 'function':
+        $last = call_user_func_array($data['call'], $args);
+      break;
+
+      case 'method':
+        $last = call_user_func_array(array($last, $data['call']), $args);
+        break;
+
+    }
+
+    // Set any errors if any where thrown.
+    if (!empty($php_errormsg)) {
+      $data['error'] = $php_errormsg;
+      ini_set('track_errors', $track_errors);
+    }
+
+    // End capture.
+    if (array_key_exists('printed', $data)) {
+      $data['printed'] = ob_get_contents();
+      ob_end_clean();
+    }
+
+    // Set what was returned from each call.
+    if (array_key_exists('return', $data)) {
+      $data['return'] = $last;
+    }
+  }
+}
diff --git a/httprl_caller.php b/httprl_caller.php
new file mode 100644
index 0000000..cacdd25
--- /dev/null
+++ b/httprl_caller.php
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * @file
+ * The PHP page that runs function callbacks for HTTPRL.
+ *
+ * All Drupal code is released under the GNU General Public License.
+ * See COPYRIGHT.txt and LICENSE.txt.
+ */
+
+// Fail very quick if things don't add up.
+if (   empty($_POST['master_key'])
+    || empty($_POST['temp_key'])
+    || strpos($_POST['temp_key'], 'httprl_') !== 0
+      ) {
+  header($_SERVER['SERVER_PROTOCOL'] . ' 403 Forbidden');
+  header('X-HTTPRL: Forbidden.');
+  exit();
+}
+
+
+/**
+ * Root directory of Drupal installation.
+ */
+define('DRUPAL_ROOT', getcwd());
+
+// Bootstrap drupal to the database level.
+require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
+drupal_bootstrap(DRUPAL_BOOTSTRAP_DATABASE);
+
+// Require httprl.module
+$filename = '';
+if (defined('VERSION') && substr(VERSION, 0, 1) >= 7) {
+  $result = db_query('SELECT filename FROM {system} WHERE name = :name', array(':name' => 'httprl'))->fetchAssoc();
+  if (!empty($result)) {
+    $filename = $result['filename'];
+  }
+}
+else {
+  $result = db_query("SELECT filename FROM {system} WHERE name = '%s'", 'httprl');
+  if (!empty($result)) {
+    $result = db_fetch_array($result);
+    if (!empty($result['filename'])) {
+      $filename = $result['filename'];
+    }
+  }
+}
+if (!empty($filename)) {
+  require_once  DRUPAL_ROOT . '/' . $result['filename'];
+}
+else {
+  httprl_fast403();
+}
+
+
+// Require async code and run it.
+require_once dirname($filename) . '/httprl.async.inc';
+httprl_async_page();