diff --git a/httprl.install b/httprl.install
index 2ab7fc6..01f029b 100644
--- a/httprl.install
+++ b/httprl.install
@@ -121,7 +121,7 @@ function httprl_requirements($phase) {
     // hostname.
     $ip = variable_get('httprl_server_addr', FALSE);
     if (!empty($ip)) {
-      if (substr(VERSION, 0, 1) >= 7) {
+      if (defined('VERSION') && substr(VERSION, 0, 1) >= 7) {
         $x = @unserialize(db_query("SELECT value FROM {variable} WHERE name = :name", array(':name' => 'httprl_server_addr'))->fetchField());
       }
       else {
@@ -179,7 +179,7 @@ function httprl_install_http_test($mode, $blocking = FALSE) {
   // Choose how to issue the HTTP request.
   if ($mode == 1) {
     // Execute the request using core.
-    if (substr(VERSION, 0, 1) >= 7) {
+    if (defined('VERSION') && substr(VERSION, 0, 1) >= 7) {
       drupal_http_request($url, $options);
     }
     else {
diff --git a/httprl.module b/httprl.module
index 82f03b7..561e83a 100644
--- a/httprl.module
+++ b/httprl.module
@@ -81,7 +81,7 @@ function httprl_menu() {
   );
 
   // Admin page.
-  if (substr(VERSION, 0, 1) >= 7) {
+  if (defined('VERSION') && substr(VERSION, 0, 1) >= 7) {
     $config_url = 'admin/config/development/httprl';
   }
   else {
@@ -121,7 +121,7 @@ function httprl_build_url_self($path = '', $detect_schema = FALSE) {
 
   // Pull in the httprl_server_addr variable from the DB.
   if (!isset($conf['httprl_server_addr']) && empty($variable_loaded)) {
-    if (substr(VERSION, 0, 1) >= 7) {
+    if (defined('VERSION') && substr(VERSION, 0, 1) >= 7) {
       $result = db_query('SELECT value FROM {variable} WHERE name = :name', array(':name' => 'httprl_server_addr'))->fetchAssoc();
       if (!empty($result)) {
         $conf['httprl_server_addr'] = unserialize($result['value']);
@@ -363,7 +363,7 @@ function httprl_request($url, $options = array()) {
   // Make sure the socket opened properly.
   if (!$fp) {
     // Make sure drupal_convert_to_utf8() is available.
-    if (substr(VERSION, 0, 1) >= 7) {
+    if (defined('VERSION') && substr(VERSION, 0, 1) >= 7) {
       require_once DRUPAL_ROOT . '/includes/unicode.inc';
     }
     else {
@@ -992,10 +992,29 @@ function httprl_post_processing(&$result) {
   httprl_decode_data($result);
   httprl_reconstruct_redirects($result);
 
+  // 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;
+  }
+
+  // Allow other modules to alter the result.
+  if ($full_bootstrap) {
+    // call hook_httprl_post_processing_alter().
+    drupal_alter('httprl_post_processing_alter', $result);
+  }
+
   // Run callback so other modules can do stuff in the event loop.
   if (!empty($result->options['callback']) && is_array($result->options['callback'])) {
+    // Get function name.
     $function = array_shift($result->options['callback']);
-    call_user_func_array($function, array_merge(array($result), $result->options['callback']));
+    // Merge in values by reference.
+    $args = array_merge(array(&$result), $result->options['callback']);
+    // Call function.
+    call_user_func_array($function, $args);
   }
 }
 
diff --git a/httprl.nonblocktest.inc b/httprl.nonblocktest.inc
index 8cf9cf8..bcc9508 100644
--- a/httprl.nonblocktest.inc
+++ b/httprl.nonblocktest.inc
@@ -19,7 +19,7 @@ function httprl_nonblockingtest_page() {
       || strpos($_GET['id'], 'httprl_') !== 0
       || $_GET['key'] != md5(drupal_get_private_key())
         ) {
-    if (substr(VERSION, 0, 1) >= 7) {
+    if (defined('VERSION') && substr(VERSION, 0, 1) >= 7) {
       drupal_exit();
     }
     else {
@@ -35,7 +35,7 @@ function httprl_nonblockingtest_page() {
     httprl_lock_release($_GET['id']);
   }
   echo t('lock @id cleared', array('@id' => $_GET['id']));
-  if (substr(VERSION, 0, 1) >= 7) {
+  if (defined('VERSION') && substr(VERSION, 0, 1) >= 7) {
     drupal_exit();
   }
   else {
@@ -55,7 +55,7 @@ function httprl_lock_release($name) {
   global $locks;
 
   unset($locks[$name]);
-  if (substr(VERSION, 0, 1) >= 7) {
+  if (defined('VERSION') && substr(VERSION, 0, 1) >= 7) {
     db_delete('semaphore')
       ->condition('name', $name)
       ->execute();