Index: ajax/authcache.php
===================================================================
--- ajax/authcache.php	(revision 2296)
+++ ajax/authcache.php	(working copy)
@@ -43,9 +43,11 @@
 
 $response = NULL; // Ajax response
 
+
 // Loop through GET key/value pairs, call functions, and return results
-if(is_array($_GET)) { // GET is faster than POST
-  foreach($_GET as $key => $value) {
+$source = authcache_get_global_array();
+if(is_array($source)) { // GET is faster than POST
+  foreach($source as $key => $value) {
     $func_name = "_authcache_$key";
     if(function_exists($func_name)) {
       $r = $func_name($value);
@@ -65,9 +67,9 @@
 // Should browser cache this response? (See authcache_example for possible usage)
 // This must be placed after bootstrap since drupal_page_header()
 // will define header to make pages not cache
-if(isset($_GET['max_age']) && is_numeric($_GET['max_age'])) {
+if(isset($source['max_age']) && is_numeric($source['max_age'])) {
   // Tell browser to cache response for 'max_age' seconds
-  header("Cache-Control: max-age={$_GET['max_age']}, must-revalidate");
+  header("Cache-Control: max-age={$source['max_age']}, must-revalidate");
   header('Expires: ' . gmdate('D, d M Y H:i:s', time()+24*60*60) . ' GMT'); // 1 day
 }
 
Index: authcache.admin.inc
===================================================================
--- authcache.admin.inc	(revision 2296)
+++ authcache.admin.inc	(working copy)
@@ -30,6 +30,18 @@
     '#type'  => 'checkbox',
     '#description' => t('This is required when you first enable the Authcache module & anonymous caching, otherwise logged-in users may receive pages intended for anonymous visitors. All users will need to relogin after this.'),
   );
+
+  $form['authcache_ajax_method'] = array(
+    '#title' => t('Method used to send ajax'),
+    '#type'  => 'radios',
+    '#options' => array(
+        'get' => "GET",
+        'post' => "POST"
+      ),
+    '#description' => t('Determinate method to send ajax with'),
+    '#default_value' => variable_get('authcache_ajax_method', 'get'),
+  );
+
  
   $form['debug'] = array(
     '#type' => 'fieldset',
@@ -145,6 +157,7 @@
   variable_set('authcache_debug_page', $form_state['values']['debug_page']);
   variable_set('authcache_debug_users', $debug_user_ray);
   variable_set('authcache_roles', $cache_roles);
+  variable_set('authcache_ajax_method', $form_state['values']['authcache_ajax_method']);
 
   drupal_set_message(t('Your Authcache settings have been saved.'));
 
Index: authcache.module
===================================================================
--- authcache.module	(revision 2296)
+++ authcache.module	(working copy)
@@ -131,6 +131,8 @@
     
     // Initialize Authcache after all other JS is loaded
     drupal_add_js('jQuery(function() { Authcache.init(); });', 'inline', 'header');
+    $data = array('Authcache' => array('ajax_method' => variable_get('authcache_ajax_method', 'get')));
+    drupal_add_js($data, 'setting', 'header');
 
     // Forcibly disable Drupal's built-in SQL caching
     // (No need to cache page twice for anonymous users)
Index: js/authcache.js
===================================================================
--- js/authcache.js	(revision 2296)
+++ js/authcache.js	(working copy)
@@ -150,7 +150,7 @@
 
   $.ajax({
     url: Drupal.settings.basePath, // index.php
-    type: "GET",
+    type: Drupal.settings.Authcache.ajax_method,
     dataType: "json",
     data: jsonData,
     
Index: authcache.inc
===================================================================
--- authcache.inc	(revision 2296)
+++ authcache.inc	(working copy)
@@ -182,4 +182,15 @@
   }
 
   return FALSE;
+}
+
+/**
+ * Returns global array depends of method we send ajax
+ */
+function authcache_get_global_array() {
+  $method = variable_get('authcache_ajax_method', 'get');
+  if ($method == 'post') {
+    return $_POST;
+  }
+  return $_GET;
 }
\ No newline at end of file